From d342b2643414af01ea0b0d0368bd658b9216a392 Mon Sep 17 00:00:00 2001
From: jan <samjan1127@gmail.com>
Date: Wed, 18 Jan 2023 18:28:05 +0900
Subject: [PATCH 1/8] =?UTF-8?q?=EC=A0=84=EB=8B=A4=EB=B9=88=20Report1,=202?=
 =?UTF-8?q?=20=EC=A0=9C=EC=B6=9C=ED=95=A9=EB=8B=88=EB=8B=A4?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/jeondabeen/report1/Report1_1      |  6 +++++
 src/jeondabeen/report1/Report1_2      |  9 +++++++
 src/jeondabeen/report1/Report1_3.java | 36 +++++++++++++++++++++++++++
 src/jeondabeen/report2/Report2_1      |  5 ++++
 src/jeondabeen/report2/Report2_2.java | 20 +++++++++++++++
 src/jeondabeen/report2/Report2_3.java |  8 ++++++
 src/jeondabeen/report2/Report2_4.java | 11 ++++++++
 src/jeondabeen/report2/Report2_5.java |  8 ++++++
 src/jeondabeen/report2/Report2_6.java | 14 +++++++++++
 9 files changed, 117 insertions(+)
 create mode 100644 src/jeondabeen/report1/Report1_1
 create mode 100644 src/jeondabeen/report1/Report1_2
 create mode 100644 src/jeondabeen/report1/Report1_3.java
 create mode 100644 src/jeondabeen/report2/Report2_1
 create mode 100644 src/jeondabeen/report2/Report2_2.java
 create mode 100644 src/jeondabeen/report2/Report2_3.java
 create mode 100644 src/jeondabeen/report2/Report2_4.java
 create mode 100644 src/jeondabeen/report2/Report2_5.java
 create mode 100644 src/jeondabeen/report2/Report2_6.java

diff --git a/src/jeondabeen/report1/Report1_1 b/src/jeondabeen/report1/Report1_1
new file mode 100644
index 0000000..669a33d
--- /dev/null
+++ b/src/jeondabeen/report1/Report1_1
@@ -0,0 +1,6 @@
+2-4번 문제
+
+정답 :   byte b = 256; => overflow 발생
+        char c = ''; => char 타입은 빈 문자 불가능
+        char answer = 'no'; => char 타입은 문자 하나만 가능
+        float f = 3.14 => float 타입이기 때문에 리터럴에 접미사 f 붙여야 하고, 끝에 세미콜론 붙여야 함
\ No newline at end of file
diff --git a/src/jeondabeen/report1/Report1_2 b/src/jeondabeen/report1/Report1_2
new file mode 100644
index 0000000..393eee8
--- /dev/null
+++ b/src/jeondabeen/report1/Report1_2
@@ -0,0 +1,9 @@
+2-7번 번 문제
+
+정답 :    System.out.println("1" + "2");  => 3
+        System.out.println(true+"");    => true
+        System.out.println('A' + 'B');  => 65 + 66 = 131
+        System.out.println('1' + 2);    => 49 + 2 = 51
+        System.out.println('1' + '2');  => 49 + 50 = 99
+        System.out.println('J' +"ava"); => Java
+        System.out.println(true + null);    => 오류
\ No newline at end of file
diff --git a/src/jeondabeen/report1/Report1_3.java b/src/jeondabeen/report1/Report1_3.java
new file mode 100644
index 0000000..bc8c3b9
--- /dev/null
+++ b/src/jeondabeen/report1/Report1_3.java
@@ -0,0 +1,36 @@
+package jeondabeen.report1;
+// 2-8 번 문제   <- 이렇게 문제 번호 작성 필수
+public class Report1_3 {
+    public static void main(String[] args) {
+        int x = 1;
+        int y = 2;
+        int z = 3;
+
+        int tmp = x;
+        x = y;
+        y = tmp;
+        tmp = z;
+        z = y;
+        y = tmp;
+
+        //예상 결과 : x=2, y=3, z=1
+        System.out.println("x="+x);
+        System.out.println("y="+y);
+        System.out.println("z="+z);
+
+        byte b = 10;
+        char ch = 'A';
+        int i = 100;
+        long l = 1000L;
+
+        AddClass addClass = new AddClass();
+        addClass.test();
+    }
+}
+
+// 필요하다면 클래스 추가
+class AddClass {
+    void test() {
+        System.out.println("AddClass.test");
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_1 b/src/jeondabeen/report2/Report2_1
new file mode 100644
index 0000000..c743ec2
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_1
@@ -0,0 +1,5 @@
+3-1번 문제
+
+정답 : b = (byte)i;
+       float f = (float)l;  => 실수형이 정수형보다 더 크기 때문
+       i = (int)ch;
\ No newline at end of file
diff --git a/src/jeondabeen/report2/Report2_2.java b/src/jeondabeen/report2/Report2_2.java
new file mode 100644
index 0000000..bfb697a
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_2.java
@@ -0,0 +1,20 @@
+package jeondabeen.report2;
+// 3-2번 문제
+public class Report2_2 {
+    public static void main(String[] args) {
+        int x = 2;
+        int y = 5;
+        char c = 'A'; // 'A'의 문자코드는 65
+
+        System.out.println(y >= 5 || x < 0 && x > 2);       // true || false && false -> true || false -> true => ||보다 &&가 우선순위 높음
+        System.out.println(y += 10 - x++);                  // y += 10 - 2 -> y = y + 8 -> y = 13 -> (x = 3)
+        System.out.println(x += 2);                         // x = x + 2 -> x = 5
+        System.out.println(!('A' <= c && c <= 'Z'));        // !(true && true) -> !true -> false
+        System.out.println('C' - c);                        // 67 - 65 = 2
+        System.out.println('5' - '0');                      // 5
+        System.out.println(c + 1);                          // 65 + 1 = 66
+        System.out.println(++c);                            // B => 증감연산자 반환 타입은 피연산자랑 같음
+        System.out.println(c++);                            // B => 후위형 증감연산, 메서드 호출 후 증가
+        System.out.println(c);                              // C
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_3.java b/src/jeondabeen/report2/Report2_3.java
new file mode 100644
index 0000000..1d01a30
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_3.java
@@ -0,0 +1,8 @@
+package jeondabeen.report2;
+
+public class Report2_3 {
+    public static void main(String[] args){
+        int num = 456;
+        System.out.println(num / 100 * 100);
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_4.java b/src/jeondabeen/report2/Report2_4.java
new file mode 100644
index 0000000..2bbda75
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_4.java
@@ -0,0 +1,11 @@
+package jeondabeen.report2;
+
+public class Report2_4 {
+    public static void main(String[] args){
+        int numOfApples = 123; // 사과의 개수
+        int sizeOfBucket = 10; // 바구니의 크기(바구니에 담을 수 있는 사과의 개수)
+        int numOfBucket = numOfApples % sizeOfBucket > 0 ? numOfApples / sizeOfBucket + 1 : numOfApples / sizeOfBucket; // 모든 사과를 담는데 필요한 바구니의 수
+
+        System.out.println("필요한 바구니의 수 :"+numOfBucket);
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_5.java b/src/jeondabeen/report2/Report2_5.java
new file mode 100644
index 0000000..faaaca0
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_5.java
@@ -0,0 +1,8 @@
+package jeondabeen.report2;
+
+public class Report2_5 {
+    public static void main(String[] args) {
+        int num = 10;
+        System.out.println(num > 0 ? "양수" : (num < 0 ? "음수" : "0"));
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_6.java b/src/jeondabeen/report2/Report2_6.java
new file mode 100644
index 0000000..b7e2806
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_6.java
@@ -0,0 +1,14 @@
+package jeondabeen.report2;
+
+public class Report2_6 {
+    public static void main(String[] args){
+        int fahrenheit = 100;
+        float celcius = 5F / 9 * (fahrenheit - 32);
+        int tmp = (int) (celcius * 1000);
+        float result = tmp % 10 >= 5 ? (tmp - (tmp % 10) + 10) / 1000F : tmp - (tmp % 10) / 1000F;
+
+        System.out.println("Fahrenheit:" + fahrenheit);
+        System.out.println("Celcius:" + result);
+        //예상 결과 : Fahrenheit:100, Celcius:37.78
+    }
+}

From 88fa74559c0af5814b9af431c1cf3f5c2b01d85f Mon Sep 17 00:00:00 2001
From: jan <samjan1127@gmail.com>
Date: Wed, 18 Jan 2023 18:52:44 +0900
Subject: [PATCH 2/8] =?UTF-8?q?=EC=A0=84=EB=8B=A4=EB=B9=88=20Report1,=202?=
 =?UTF-8?q?=20=EC=A0=9C=EC=B6=9C=ED=95=A9=EB=8B=88=EB=8B=A4?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/jeondabeen/report1/Report1_1      |  6 +++++
 src/jeondabeen/report1/Report1_2      |  9 +++++++
 src/jeondabeen/report1/Report1_3.java | 36 +++++++++++++++++++++++++++
 src/jeondabeen/report2/Report2_1      |  5 ++++
 src/jeondabeen/report2/Report2_2.java | 20 +++++++++++++++
 src/jeondabeen/report2/Report2_3.java |  8 ++++++
 src/jeondabeen/report2/Report2_4.java | 11 ++++++++
 src/jeondabeen/report2/Report2_5.java |  8 ++++++
 src/jeondabeen/report2/Report2_6.java | 14 +++++++++++
 9 files changed, 117 insertions(+)
 create mode 100644 src/jeondabeen/report1/Report1_1
 create mode 100644 src/jeondabeen/report1/Report1_2
 create mode 100644 src/jeondabeen/report1/Report1_3.java
 create mode 100644 src/jeondabeen/report2/Report2_1
 create mode 100644 src/jeondabeen/report2/Report2_2.java
 create mode 100644 src/jeondabeen/report2/Report2_3.java
 create mode 100644 src/jeondabeen/report2/Report2_4.java
 create mode 100644 src/jeondabeen/report2/Report2_5.java
 create mode 100644 src/jeondabeen/report2/Report2_6.java

diff --git a/src/jeondabeen/report1/Report1_1 b/src/jeondabeen/report1/Report1_1
new file mode 100644
index 0000000..669a33d
--- /dev/null
+++ b/src/jeondabeen/report1/Report1_1
@@ -0,0 +1,6 @@
+2-4번 문제
+
+정답 :   byte b = 256; => overflow 발생
+        char c = ''; => char 타입은 빈 문자 불가능
+        char answer = 'no'; => char 타입은 문자 하나만 가능
+        float f = 3.14 => float 타입이기 때문에 리터럴에 접미사 f 붙여야 하고, 끝에 세미콜론 붙여야 함
\ No newline at end of file
diff --git a/src/jeondabeen/report1/Report1_2 b/src/jeondabeen/report1/Report1_2
new file mode 100644
index 0000000..393eee8
--- /dev/null
+++ b/src/jeondabeen/report1/Report1_2
@@ -0,0 +1,9 @@
+2-7번 번 문제
+
+정답 :    System.out.println("1" + "2");  => 3
+        System.out.println(true+"");    => true
+        System.out.println('A' + 'B');  => 65 + 66 = 131
+        System.out.println('1' + 2);    => 49 + 2 = 51
+        System.out.println('1' + '2');  => 49 + 50 = 99
+        System.out.println('J' +"ava"); => Java
+        System.out.println(true + null);    => 오류
\ No newline at end of file
diff --git a/src/jeondabeen/report1/Report1_3.java b/src/jeondabeen/report1/Report1_3.java
new file mode 100644
index 0000000..bc8c3b9
--- /dev/null
+++ b/src/jeondabeen/report1/Report1_3.java
@@ -0,0 +1,36 @@
+package jeondabeen.report1;
+// 2-8 번 문제   <- 이렇게 문제 번호 작성 필수
+public class Report1_3 {
+    public static void main(String[] args) {
+        int x = 1;
+        int y = 2;
+        int z = 3;
+
+        int tmp = x;
+        x = y;
+        y = tmp;
+        tmp = z;
+        z = y;
+        y = tmp;
+
+        //예상 결과 : x=2, y=3, z=1
+        System.out.println("x="+x);
+        System.out.println("y="+y);
+        System.out.println("z="+z);
+
+        byte b = 10;
+        char ch = 'A';
+        int i = 100;
+        long l = 1000L;
+
+        AddClass addClass = new AddClass();
+        addClass.test();
+    }
+}
+
+// 필요하다면 클래스 추가
+class AddClass {
+    void test() {
+        System.out.println("AddClass.test");
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_1 b/src/jeondabeen/report2/Report2_1
new file mode 100644
index 0000000..c743ec2
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_1
@@ -0,0 +1,5 @@
+3-1번 문제
+
+정답 : b = (byte)i;
+       float f = (float)l;  => 실수형이 정수형보다 더 크기 때문
+       i = (int)ch;
\ No newline at end of file
diff --git a/src/jeondabeen/report2/Report2_2.java b/src/jeondabeen/report2/Report2_2.java
new file mode 100644
index 0000000..bfb697a
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_2.java
@@ -0,0 +1,20 @@
+package jeondabeen.report2;
+// 3-2번 문제
+public class Report2_2 {
+    public static void main(String[] args) {
+        int x = 2;
+        int y = 5;
+        char c = 'A'; // 'A'의 문자코드는 65
+
+        System.out.println(y >= 5 || x < 0 && x > 2);       // true || false && false -> true || false -> true => ||보다 &&가 우선순위 높음
+        System.out.println(y += 10 - x++);                  // y += 10 - 2 -> y = y + 8 -> y = 13 -> (x = 3)
+        System.out.println(x += 2);                         // x = x + 2 -> x = 5
+        System.out.println(!('A' <= c && c <= 'Z'));        // !(true && true) -> !true -> false
+        System.out.println('C' - c);                        // 67 - 65 = 2
+        System.out.println('5' - '0');                      // 5
+        System.out.println(c + 1);                          // 65 + 1 = 66
+        System.out.println(++c);                            // B => 증감연산자 반환 타입은 피연산자랑 같음
+        System.out.println(c++);                            // B => 후위형 증감연산, 메서드 호출 후 증가
+        System.out.println(c);                              // C
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_3.java b/src/jeondabeen/report2/Report2_3.java
new file mode 100644
index 0000000..1d01a30
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_3.java
@@ -0,0 +1,8 @@
+package jeondabeen.report2;
+
+public class Report2_3 {
+    public static void main(String[] args){
+        int num = 456;
+        System.out.println(num / 100 * 100);
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_4.java b/src/jeondabeen/report2/Report2_4.java
new file mode 100644
index 0000000..2bbda75
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_4.java
@@ -0,0 +1,11 @@
+package jeondabeen.report2;
+
+public class Report2_4 {
+    public static void main(String[] args){
+        int numOfApples = 123; // 사과의 개수
+        int sizeOfBucket = 10; // 바구니의 크기(바구니에 담을 수 있는 사과의 개수)
+        int numOfBucket = numOfApples % sizeOfBucket > 0 ? numOfApples / sizeOfBucket + 1 : numOfApples / sizeOfBucket; // 모든 사과를 담는데 필요한 바구니의 수
+
+        System.out.println("필요한 바구니의 수 :"+numOfBucket);
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_5.java b/src/jeondabeen/report2/Report2_5.java
new file mode 100644
index 0000000..faaaca0
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_5.java
@@ -0,0 +1,8 @@
+package jeondabeen.report2;
+
+public class Report2_5 {
+    public static void main(String[] args) {
+        int num = 10;
+        System.out.println(num > 0 ? "양수" : (num < 0 ? "음수" : "0"));
+    }
+}
diff --git a/src/jeondabeen/report2/Report2_6.java b/src/jeondabeen/report2/Report2_6.java
new file mode 100644
index 0000000..b7e2806
--- /dev/null
+++ b/src/jeondabeen/report2/Report2_6.java
@@ -0,0 +1,14 @@
+package jeondabeen.report2;
+
+public class Report2_6 {
+    public static void main(String[] args){
+        int fahrenheit = 100;
+        float celcius = 5F / 9 * (fahrenheit - 32);
+        int tmp = (int) (celcius * 1000);
+        float result = tmp % 10 >= 5 ? (tmp - (tmp % 10) + 10) / 1000F : tmp - (tmp % 10) / 1000F;
+
+        System.out.println("Fahrenheit:" + fahrenheit);
+        System.out.println("Celcius:" + result);
+        //예상 결과 : Fahrenheit:100, Celcius:37.78
+    }
+}

From b5643aeb4f3c3a99734ba8ea6735eb6762e8f60d Mon Sep 17 00:00:00 2001
From: jan <samjan1127@gmail.com>
Date: Thu, 19 Jan 2023 21:54:46 +0900
Subject: [PATCH 3/8] add: report3,4

---
 src/jeondabeen/report3/Report3_1       |  25 +++++++++++++++++++
 src/jeondabeen/report3/Report3_10.java |  28 ++++++++++++++++++++++
 src/jeondabeen/report3/Report3_2.java  |  13 ++++++++++
 src/jeondabeen/report3/Report3_3.java  |  15 ++++++++++++
 src/jeondabeen/report3/Report3_4.java  |  23 ++++++++++++++++++
 src/jeondabeen/report3/Report3_5.java  |  12 ++++++++++
 src/jeondabeen/report3/Report3_6.java  |  13 ++++++++++
 src/jeondabeen/report3/Report3_7.java  |  15 ++++++++++++
 src/jeondabeen/report3/Report3_8.java  |   8 +++++++
 src/jeondabeen/report3/Report3_9.java  |  17 +++++++++++++
 src/jeondabeen/report3/flow chart.png  | Bin 0 -> 18374 bytes
 src/jeondabeen/report4/Report4_1       |   5 ++++
 src/jeondabeen/report4/Report4_2       |   8 +++++++
 src/jeondabeen/report4/Report4_3.java  |  15 ++++++++++++
 src/jeondabeen/report4/Report4_4.java  |  28 ++++++++++++++++++++++
 src/jeondabeen/report4/Report4_5.java  |  31 ++++++++++++++++++++++++
 src/jeondabeen/report4/Report4_6.java  |  32 +++++++++++++++++++++++++
 17 files changed, 288 insertions(+)
 create mode 100644 src/jeondabeen/report3/Report3_1
 create mode 100644 src/jeondabeen/report3/Report3_10.java
 create mode 100644 src/jeondabeen/report3/Report3_2.java
 create mode 100644 src/jeondabeen/report3/Report3_3.java
 create mode 100644 src/jeondabeen/report3/Report3_4.java
 create mode 100644 src/jeondabeen/report3/Report3_5.java
 create mode 100644 src/jeondabeen/report3/Report3_6.java
 create mode 100644 src/jeondabeen/report3/Report3_7.java
 create mode 100644 src/jeondabeen/report3/Report3_8.java
 create mode 100644 src/jeondabeen/report3/Report3_9.java
 create mode 100644 src/jeondabeen/report3/flow chart.png
 create mode 100644 src/jeondabeen/report4/Report4_1
 create mode 100644 src/jeondabeen/report4/Report4_2
 create mode 100644 src/jeondabeen/report4/Report4_3.java
 create mode 100644 src/jeondabeen/report4/Report4_4.java
 create mode 100644 src/jeondabeen/report4/Report4_5.java
 create mode 100644 src/jeondabeen/report4/Report4_6.java

diff --git a/src/jeondabeen/report3/Report3_1 b/src/jeondabeen/report3/Report3_1
new file mode 100644
index 0000000..a98d5f2
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_1
@@ -0,0 +1,25 @@
+//4-1. 다음의 문장들을 조건식으로 표현해보세요.
+
+//int형 변수 x가 10보다 크고 20보다 작을 때 true인 조건식
+if (x > 10 && x < 20)
+
+//char형 변수 ch가 공백이나 탭이 아닐 때 true인 조건식
+if (ch != '\n' && ch != '\t')
+
+//char형 변수 ch가 'x' 또는 'X'일 때 true인 조건식
+if (ch == 'x' || ch == 'X')
+
+//char형 변수 ch가 숫자('0'~'9')일 때 true인 조건식
+if (ch >= '0' && ch <= '9')
+
+//char형 변수 ch가 영문자(대문자 또는 소문자)일 때 true인 조건식
+if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))
+
+//int형 변수 year가 400으로 나눠떨어지거나 또는 4로 나눠떨어지고 100으로 나눠떨어지지 않을때 true인 조건식
+if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
+
+//boolean형 변수 powerOn이 false일 때 true인 조건식
+if (!powerOn)
+
+//문자열 참조변수 str이 "yes"일 때 true인 조건식
+if (str.equals("yes"))
\ No newline at end of file
diff --git a/src/jeondabeen/report3/Report3_10.java b/src/jeondabeen/report3/Report3_10.java
new file mode 100644
index 0000000..e8df7a7
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_10.java
@@ -0,0 +1,28 @@
+package jeondabeen.report3;
+
+public class Report3_10 {
+    public static void main(String[] args) {
+        // 1~100사이의 임의의 값을 얻어서  answer에 저장한다.
+        int answer = (int) (Math.random() * 100) + 1;
+        int input = 0; //사용자입력을 저장할 공간
+        int count = 0; //시도횟수를 세기위한 변수
+
+        // 화면으로 부터 사용자입력을 받기 위해서 Scanner클래스 사용
+        java.util.Scanner s = new java.util.Scanner(System.in);
+        do {
+            count++;
+            System.out.print("1과 100사이의 값을 입력하세요 : ");
+            input = s.nextInt(); //입력받은 값을 변수 input에 저장한다.
+
+            if (input < answer) {
+                System.out.println("더 큰 수를 입력하세요.");
+            } else if (input > answer) {
+                System.out.println("더 작은 수를 입력하세요.");
+            } else {
+                System.out.println("맞혔습니다.");
+                System.out.println("시도횟수는 " + count + "번입니다.");
+                break;
+            }
+        } while(true); //무한반복문
+    }
+}
diff --git a/src/jeondabeen/report3/Report3_2.java b/src/jeondabeen/report3/Report3_2.java
new file mode 100644
index 0000000..ccff918
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_2.java
@@ -0,0 +1,13 @@
+package jeondabeen.report3;
+
+public class Report3_2 {
+    public static void main(String[] args) {
+        int sum = 0;
+
+        for (int i = 1; i <= 20; i++) {
+            if (i % 2 == 0 || i % 3 == 0) continue;
+            sum += i;
+        }
+        System.out.println("sum=" + sum);
+    }
+}
diff --git a/src/jeondabeen/report3/Report3_3.java b/src/jeondabeen/report3/Report3_3.java
new file mode 100644
index 0000000..1f72621
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_3.java
@@ -0,0 +1,15 @@
+package jeondabeen.report3;
+
+public class Report3_3 {
+    public static void main(String[] args) {
+        int sum = 0;
+        int totalSum = 0;
+
+        for (int i = 1; i <= 10; i++) {
+            sum += i;
+            totalSum += sum;
+        }
+
+        System.out.println("totalSum="+totalSum);
+    }
+}
diff --git a/src/jeondabeen/report3/Report3_4.java b/src/jeondabeen/report3/Report3_4.java
new file mode 100644
index 0000000..4bac111
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_4.java
@@ -0,0 +1,23 @@
+package jeondabeen.report3;
+
+public class Report3_4 {
+    public static void main(String[] args) {
+        int sum = 0; // 총합을 저장할 변수
+        int s = 1; // 값의 부호를 바꿔주는데 사용할 변수
+        int num = 0;
+
+        while (sum < 100) {
+            if (num != 0 && num % 2 == 0) {
+                s = 1;
+            } else if (num % 2 != 0) {
+                s = -1;
+            }
+
+            num = (Math.abs(num) + 1) * s;
+            sum += num;
+        }
+        System.out.println();
+        System.out.println("num="+num);
+        System.out.println("sum="+sum);
+    }
+}
diff --git a/src/jeondabeen/report3/Report3_5.java b/src/jeondabeen/report3/Report3_5.java
new file mode 100644
index 0000000..0b18820
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_5.java
@@ -0,0 +1,12 @@
+package jeondabeen.report3;
+
+public class Report3_5 {
+    public static void main(String[] args) {
+        int k = 0;
+        while (k <= 10) {
+            System.out.print("*".repeat(k + 1));
+            System.out.println();
+            k++;
+        }
+    }
+}
diff --git a/src/jeondabeen/report3/Report3_6.java b/src/jeondabeen/report3/Report3_6.java
new file mode 100644
index 0000000..e080038
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_6.java
@@ -0,0 +1,13 @@
+package jeondabeen.report3;
+
+public class Report3_6 {
+    public static void main(String[] args) {
+        for (int i = 1; i <= 6; i++) {
+            for (int j = 1; j < 6; j++) {
+                if (i + j == 6) {
+                    System.out.println("[" + i + ", " + j + "]");
+                }
+            }
+        }
+    }
+}
diff --git a/src/jeondabeen/report3/Report3_7.java b/src/jeondabeen/report3/Report3_7.java
new file mode 100644
index 0000000..50f4a65
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_7.java
@@ -0,0 +1,15 @@
+package jeondabeen.report3;
+
+public class Report3_7 {
+    public static void main(String[] args) {
+        String str = "12345";
+        int sum = 0;
+
+        for (int i = 0; i < str.length(); i++) {
+            sum += str.charAt(i) - '0';
+        }
+
+        //예상 결과 : sum=15
+        System.out.println("sum=" + sum);
+    }
+}
diff --git a/src/jeondabeen/report3/Report3_8.java b/src/jeondabeen/report3/Report3_8.java
new file mode 100644
index 0000000..d4d1fb9
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_8.java
@@ -0,0 +1,8 @@
+package jeondabeen.report3;
+
+public class Report3_8 {
+    public static void main(String[] args){
+        int value = (int) (Math.random() * 6) + 1;
+        System.out.println("value:"+value);
+    }
+}
diff --git a/src/jeondabeen/report3/Report3_9.java b/src/jeondabeen/report3/Report3_9.java
new file mode 100644
index 0000000..de3f7c4
--- /dev/null
+++ b/src/jeondabeen/report3/Report3_9.java
@@ -0,0 +1,17 @@
+package jeondabeen.report3;
+
+import java.util.Arrays;
+
+public class Report3_9 {
+    public static void main(String[] args) {
+        int num = 12345;
+        int sum = 0;
+
+        while (num > 0) {
+            sum += num % 10;
+            num /= 10;
+        }
+
+        System.out.println("sum="+sum);
+    }
+}
diff --git a/src/jeondabeen/report3/flow chart.png b/src/jeondabeen/report3/flow chart.png
new file mode 100644
index 0000000000000000000000000000000000000000..0aefbccb7424dfd710026c46bead7cf992674d8f
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literal 0
HcmV?d00001

diff --git a/src/jeondabeen/report4/Report4_1 b/src/jeondabeen/report4/Report4_1
new file mode 100644
index 0000000..e20530e
--- /dev/null
+++ b/src/jeondabeen/report4/Report4_1
@@ -0,0 +1,5 @@
+int[] arr[];
+=> int[] arr; OR int arr[];
+
+int[] arr[] = new int[3][];
+=> int[][] arr = new int[3][]; OR int arr[][] = new int[3][];
\ No newline at end of file
diff --git a/src/jeondabeen/report4/Report4_2 b/src/jeondabeen/report4/Report4_2
new file mode 100644
index 0000000..f22e2fd
--- /dev/null
+++ b/src/jeondabeen/report4/Report4_2
@@ -0,0 +1,8 @@
+int[][]arr ={
+    {5,5,5,5,5},
+    {10,10,10},
+    {20,20,20,20},
+    {30,30}
+};
+
+arr[3].length => 2
\ No newline at end of file
diff --git a/src/jeondabeen/report4/Report4_3.java b/src/jeondabeen/report4/Report4_3.java
new file mode 100644
index 0000000..898144c
--- /dev/null
+++ b/src/jeondabeen/report4/Report4_3.java
@@ -0,0 +1,15 @@
+package jeondabeen.report4;
+
+public class Report4_3 {
+    public static void main(String[] args){
+        int[] arr = {10, 20, 30, 40, 50};
+        int sum = 0;
+
+        for (int num : arr) {
+            sum += num;
+        }
+
+        //예상 결과 : sum=150
+        System.out.println("sum="+sum);
+    }
+}
diff --git a/src/jeondabeen/report4/Report4_4.java b/src/jeondabeen/report4/Report4_4.java
new file mode 100644
index 0000000..c166aee
--- /dev/null
+++ b/src/jeondabeen/report4/Report4_4.java
@@ -0,0 +1,28 @@
+package jeondabeen.report4;
+
+public class Report4_4 {
+    public static void main(String[] args) {
+        int[][] arr = {
+                { 5, 5, 5, 5, 5 },
+                { 10, 10, 10, 10, 10 },
+                { 20, 20, 20, 20, 20 },
+                { 30, 30, 30, 30, 30 }
+        };
+
+        int total = 0;
+        float average = 0;
+
+        int numCount = 0;
+        for (int[] ints : arr) {
+            for (int num : ints) {
+                total += num;
+                numCount++;
+            }
+        }
+
+        average = (float) total / numCount;
+
+        System.out.println("total=" + total);
+        System.out.println("average=" + average);
+    } 
+}
diff --git a/src/jeondabeen/report4/Report4_5.java b/src/jeondabeen/report4/Report4_5.java
new file mode 100644
index 0000000..f1fbdb4
--- /dev/null
+++ b/src/jeondabeen/report4/Report4_5.java
@@ -0,0 +1,31 @@
+package jeondabeen.report4;
+
+import java.util.Arrays;
+
+public class Report4_5 {
+    public static void main(String[] args) {
+        int[] ballArr = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        int[] ball3 = new int[3];
+
+        // 배열 ballArr의 임의의 요소를 골라서 위치를 바꾼다
+        for (int i = 0; i < ballArr.length; i++) {
+            int j = (int) (Math.random() * ballArr.length);
+            int tmp = 0;
+
+            tmp = ballArr[i];
+            ballArr[i] = ballArr[j];
+            ballArr[j] = tmp;
+        }
+
+        for (int i = 0; i < 3; i++) {
+            ball3[i] = ballArr[i];
+        }
+
+        // 배열 ballArr의 앞에서 3개의 수를 배열 ball3로 복사한다
+        ball3 = Arrays.copyOf(ballArr, 3);
+
+        for (int i = 0; i < ball3.length; i++) {
+            System.out.print(ball3[i]);
+        }
+    }
+}
diff --git a/src/jeondabeen/report4/Report4_6.java b/src/jeondabeen/report4/Report4_6.java
new file mode 100644
index 0000000..a742fc7
--- /dev/null
+++ b/src/jeondabeen/report4/Report4_6.java
@@ -0,0 +1,32 @@
+package jeondabeen.report4;
+
+import java.util.Scanner;
+
+public class Report4_6 {
+    public static void main(String args[]) {
+        String[] words = { "television", "computer", "mouse", "phone" };
+
+        Scanner scanner = new Scanner(System.in);
+
+        for (int i = 0; i < words.length; i++) {
+            char[] question = words[i].toCharArray(); // String을 char[]로 변환
+
+            for (int j = 0; j < question.length; j++) {
+                int k = (int) (Math.random() * question.length);
+
+                char tmp = question[j];
+                question[j] = question[k];
+                question[k] = tmp;
+            }
+
+            System.out.printf("Q%d. %s의 정답을 입력하세요 .>", i + 1, new String(question));
+            String answer = scanner.nextLine();
+
+            // trim()으로 answer의 좌우 공백을 제거한 후, equals로 word[i]와 비교
+            if (words[i].equals(answer.trim()))
+                System.out.printf("맞았습니다.%n%n");
+            else
+                System.out.printf("틀렸습니다.%n%n");
+        }
+    }
+}

From e5c4e4f7047e8df862703a2b5192d3b03fccfad9 Mon Sep 17 00:00:00 2001
From: jan <samjan1127@gmail.com>
Date: Thu, 19 Jan 2023 22:21:14 +0900
Subject: [PATCH 4/8] modify: report1_3

---
 src/jeondabeen/report1/Report1_3.java | 21 ++-------------------
 1 file changed, 2 insertions(+), 19 deletions(-)

diff --git a/src/jeondabeen/report1/Report1_3.java b/src/jeondabeen/report1/Report1_3.java
index bc8c3b9..b87c63a 100644
--- a/src/jeondabeen/report1/Report1_3.java
+++ b/src/jeondabeen/report1/Report1_3.java
@@ -8,29 +8,12 @@ public static void main(String[] args) {
 
         int tmp = x;
         x = y;
-        y = tmp;
-        tmp = z;
-        z = y;
-        y = tmp;
+        y = z;
+        z = tmp;
 
         //예상 결과 : x=2, y=3, z=1
         System.out.println("x="+x);
         System.out.println("y="+y);
         System.out.println("z="+z);
-
-        byte b = 10;
-        char ch = 'A';
-        int i = 100;
-        long l = 1000L;
-
-        AddClass addClass = new AddClass();
-        addClass.test();
-    }
-}
-
-// 필요하다면 클래스 추가
-class AddClass {
-    void test() {
-        System.out.println("AddClass.test");
     }
 }

From db3d476e360a72b6538f10d89a97483019f0dba0 Mon Sep 17 00:00:00 2001
From: jan <samjan1127@gmail.com>
Date: Sat, 21 Jan 2023 12:17:17 +0900
Subject: [PATCH 5/8] add: report5

---
 src/jeondabeen/report5/Report5_1      | 12 ++++++++++
 src/jeondabeen/report5/Report5_2.java | 10 ++++++++
 src/jeondabeen/report5/Report5_3.java | 17 ++++++++++++++
 src/jeondabeen/report5/Report5_4.java | 15 ++++++++++++
 src/jeondabeen/report5/Report5_5.java | 23 ++++++++++++++++++
 src/jeondabeen/report5/Student.java   | 34 +++++++++++++++++++++++++++
 6 files changed, 111 insertions(+)
 create mode 100644 src/jeondabeen/report5/Report5_1
 create mode 100644 src/jeondabeen/report5/Report5_2.java
 create mode 100644 src/jeondabeen/report5/Report5_3.java
 create mode 100644 src/jeondabeen/report5/Report5_4.java
 create mode 100644 src/jeondabeen/report5/Report5_5.java
 create mode 100644 src/jeondabeen/report5/Student.java

diff --git a/src/jeondabeen/report5/Report5_1 b/src/jeondabeen/report5/Report5_1
new file mode 100644
index 0000000..a1e152f
--- /dev/null
+++ b/src/jeondabeen/report5/Report5_1
@@ -0,0 +1,12 @@
+//6-1. 다음과 같은 멤버 변수를 갖는 Student 클래스를 정의하세요.
+//타입 : String, 변수명 : name, 설명 : 학생 이름
+//타입 : int, 변수명 : ban, 설명 : 반
+//타입 : int, 변수명 : no, 설명 : 번호
+//타입 : int, 변수명 : kor, 설명 : 국어 점수
+//타입 : int, 변수명 : eng, 설명 : 영어 점수
+//타입 : int, 변수명 : math, 설명 : 수학 점수
+
+class Student {
+    String name;
+    int ban, no, kor, eng, math;
+}
diff --git a/src/jeondabeen/report5/Report5_2.java b/src/jeondabeen/report5/Report5_2.java
new file mode 100644
index 0000000..a0dc649
--- /dev/null
+++ b/src/jeondabeen/report5/Report5_2.java
@@ -0,0 +1,10 @@
+package jeondabeen.report5;
+
+public class Report5_2 {
+    public static void main(String[] args){
+        Student s = new Student("홍길동", 1, 1, 100, 60, 76);
+
+        String str = s.info();
+        System.out.println(str);
+    }// 예상 결과 : 홍길동, 1, 1, 100, 60, 76, 236, 78.7
+}
diff --git a/src/jeondabeen/report5/Report5_3.java b/src/jeondabeen/report5/Report5_3.java
new file mode 100644
index 0000000..99d35bc
--- /dev/null
+++ b/src/jeondabeen/report5/Report5_3.java
@@ -0,0 +1,17 @@
+package jeondabeen.report5;
+
+public class Report5_3 {
+    public static void main(String args[]) {
+        Student s = new Student();
+        s.name = "홍길동";
+        s.ban = 1;
+        s.no = 1;
+        s.kor = 100;
+        s.eng = 60;
+        s.math = 76;
+        System.out.println("이름 : " + s.name);
+        System.out.println("총점 : " + s.getTotal());
+        System.out.println("평균 : " + s.getAverage());
+    }//예상 결과 : 이름 : 홍길동, 총점 : 236, 평균 : 78.7
+}
+
diff --git a/src/jeondabeen/report5/Report5_4.java b/src/jeondabeen/report5/Report5_4.java
new file mode 100644
index 0000000..0887e2f
--- /dev/null
+++ b/src/jeondabeen/report5/Report5_4.java
@@ -0,0 +1,15 @@
+package jeondabeen.report5;
+
+class PlayingCard  {
+    int kind;       // 인스턴스 변수
+    int num;        // 인스턴스 변수
+    static int width;   // 클래스 변수
+    static int height;  // 클래스 변수
+    PlayingCard(int k, int n) {     // 매개변수 == 지역변수
+        kind = k;
+        num = n;
+    }
+    public static void main(String args[]) {     // 매개변수 == 지역변수
+        PlayingCard card = new PlayingCard(1,1);    // 지역변수
+    }
+}
diff --git a/src/jeondabeen/report5/Report5_5.java b/src/jeondabeen/report5/Report5_5.java
new file mode 100644
index 0000000..95c008b
--- /dev/null
+++ b/src/jeondabeen/report5/Report5_5.java
@@ -0,0 +1,23 @@
+package jeondabeen.report5;
+
+public class Report5_5 {
+    // weapon, armor에 static을 붙여야 한다.
+    // weapon과 armor는 공유하는/같아야 하는 속성이기 때문이다.
+}
+
+class Marine {
+    int x=0, y=0; //Marine의 위치좌표 (x,y)
+    int hp = 60; //현재 체력
+    int weapon = 6; //공격력
+    int armor = 0; //방어력
+    void weaponUp() {
+        weapon++;
+    }
+    void armorUp() {
+        armor++;
+    }
+    void move(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+}
\ No newline at end of file
diff --git a/src/jeondabeen/report5/Student.java b/src/jeondabeen/report5/Student.java
new file mode 100644
index 0000000..2bf2f9f
--- /dev/null
+++ b/src/jeondabeen/report5/Student.java
@@ -0,0 +1,34 @@
+package jeondabeen.report5;
+
+class Student{
+    String name;
+    int ban, no, kor, eng, math;
+
+    public Student() {
+    }
+
+    Student(String name, int ban, int no, int kor, int eng, int math) {
+        this.name = name;
+        this.ban = ban;
+        this.no = no;
+        this.kor = kor;
+        this.eng = eng;
+        this.math = math;
+    }
+
+    String info() {
+        // 예상 결과 : 홍길동, 1, 1, 100, 60, 76, 236, 78.7
+        int total = kor+eng+math;
+        float avg = (int) (total / 0.3 + 0.5) / 10f;
+
+        return name + ", " + ban + ", " + no + ", " + kor + ", " + eng + ", " + math + ", " + total + ", " + avg;
+    }
+
+    int getTotal() {
+        return kor + eng + math;
+    }
+
+    float getAverage() {
+        return (int) (getTotal() / 0.3 + 0.5) / 10f;
+    }
+}
\ No newline at end of file

From 49aa3ca76c7a5b8ea635b9be447434ed68e83de3 Mon Sep 17 00:00:00 2001
From: jan <samjan1127@gmail.com>
Date: Tue, 24 Jan 2023 23:23:22 +0900
Subject: [PATCH 6/8] add: report6

---
 src/jeondabeen/report6/Report6_1.md   | 10 ++++++++++
 src/jeondabeen/report6/Report6_2.md   |  5 +++++
 src/jeondabeen/report6/Report6_3.md   |  6 ++++++
 src/jeondabeen/report6/Report6_4.md   |  6 ++++++
 src/jeondabeen/report6/Report6_5.md   |  8 ++++++++
 src/jeondabeen/report6/Report6_6.md   |  3 +++
 src/jeondabeen/report6/Report6_7.md   |  8 ++++++++
 src/jeondabeen/report6/Report6_8.md   |  4 ++++
 src/jeondabeen/report6/Report6_9.md   | 17 +++++++++++++++++
 src/jeondabeen/report7/Report7_1.java |  2 ++
 src/jeondabeen/report7/Report7_2.java |  2 ++
 11 files changed, 71 insertions(+)
 create mode 100644 src/jeondabeen/report6/Report6_1.md
 create mode 100644 src/jeondabeen/report6/Report6_2.md
 create mode 100644 src/jeondabeen/report6/Report6_3.md
 create mode 100644 src/jeondabeen/report6/Report6_4.md
 create mode 100644 src/jeondabeen/report6/Report6_5.md
 create mode 100644 src/jeondabeen/report6/Report6_6.md
 create mode 100644 src/jeondabeen/report6/Report6_7.md
 create mode 100644 src/jeondabeen/report6/Report6_8.md
 create mode 100644 src/jeondabeen/report6/Report6_9.md
 create mode 100644 src/jeondabeen/report7/Report7_1.java
 create mode 100644 src/jeondabeen/report7/Report7_2.java

diff --git a/src/jeondabeen/report6/Report6_1.md b/src/jeondabeen/report6/Report6_1.md
new file mode 100644
index 0000000..0bcd7c4
--- /dev/null
+++ b/src/jeondabeen/report6/Report6_1.md
@@ -0,0 +1,10 @@
+6-8. 다음 중 생성자에 대한 설명으로 옳지 않은 것은? (모두 고르시오)   
+b. 생성자는 객체를 생성하기 위한 것이다.   
+=> 생성자는 인스턴스 초기화를 위해 사용되는 것, 객체를 생성하는 것은 new 연산자이다.
+
+c. 클래스에는 생성자가 반드시 하나 이상 있어야 한다.   
+=> 특정한 인자를 받아야 하거나, 인스턴스가 생성되고 바로 실행되어야 할 작업이 없다면 생성자를 만들 필요는 없다.   
+    생성자가 하나도 없는 클래스라면 컴파일러가 자동으로 기본 생성자를 만들어 주기 때문이다. 
+
+e. 생성자는 오버로딩 할 수 없다.   
+=> 생성자는 메서드이고, 인스턴스마다 초기화 작업이 다를 수 있기 때문에 오버로딩 가능하다.
\ No newline at end of file
diff --git a/src/jeondabeen/report6/Report6_2.md b/src/jeondabeen/report6/Report6_2.md
new file mode 100644
index 0000000..50793f3
--- /dev/null
+++ b/src/jeondabeen/report6/Report6_2.md
@@ -0,0 +1,5 @@
+6-9. 다음 중 this에 대한 설명으로 맞지 않은 것은? (모두 고르시오)   
+b. 클래스 내에서라면 어디서든 사용할 수 있다.      
+=> 인스턴스 메서드 내에서만 사용할 수 있다. this라는 참조변수는 인스턴스를 가리키는 것이고    
+   this는 인스턴스 메서드 안에 인스턴스를 가리키는 지역변수로 숨겨져 있다.   
+   따라서 클래스 메서드에서는 사용할 수 없다.
\ No newline at end of file
diff --git a/src/jeondabeen/report6/Report6_3.md b/src/jeondabeen/report6/Report6_3.md
new file mode 100644
index 0000000..e20fc5e
--- /dev/null
+++ b/src/jeondabeen/report6/Report6_3.md
@@ -0,0 +1,6 @@
+6-10. 다음 중 오버로딩이 성립하기 위한 조건이 아닌 것은? (모두 고르시오)   
+c. 리턴타입이 달라야 한다.   
+=> 리턴 타입은 상관 없다!
+
+d. 매개변수의 이름이 달라야 한다.   
+=> 매개변수 이름은 상관 없다. 타입과 개수가 달라야 한다.
\ No newline at end of file
diff --git a/src/jeondabeen/report6/Report6_4.md b/src/jeondabeen/report6/Report6_4.md
new file mode 100644
index 0000000..8605d4e
--- /dev/null
+++ b/src/jeondabeen/report6/Report6_4.md
@@ -0,0 +1,6 @@
+6-11. 다음 중 아래의 add메서드를 올바르게 오버로딩 한 것은? (모두 고르시오)
+> long add(int a, int b) { return a+b; }
+
+b. long add(long a, long b) { return a+b; }   
+c. int add(byte a, byte b) { return a+b; }   
+d. int add(long a, int b) { return (int)(a+b); }   
\ No newline at end of file
diff --git a/src/jeondabeen/report6/Report6_5.md b/src/jeondabeen/report6/Report6_5.md
new file mode 100644
index 0000000..3fdc6b2
--- /dev/null
+++ b/src/jeondabeen/report6/Report6_5.md
@@ -0,0 +1,8 @@
+6-12. 다음 중 초기화에 대한 설명으로 옳지 않은 것은? (모두 고르시오)   
+
+c. 초기화 블럭보다 생성자가 먼저 수행된다.   
+=> static 초기화 블럭은 항상 생성자보다 먼저 수행되고,
+   인스턴스 초기화 블럭은 생성자에 공통된 코드를 넣는데 사용되기 때문에 생성자보다 먼저 수행된다.
+
+e. 클래스변수보다 인스턴스변수가 먼저 초기화된다.   
+=> 클래스 변수는 객체가 생성되지 않아도 사용할 수 있어 클래스 변수가 먼저 초기화된다.
\ No newline at end of file
diff --git a/src/jeondabeen/report6/Report6_6.md b/src/jeondabeen/report6/Report6_6.md
new file mode 100644
index 0000000..3bd95e2
--- /dev/null
+++ b/src/jeondabeen/report6/Report6_6.md
@@ -0,0 +1,3 @@
+6-13. 다음 중 인스턴스변수의 초기화 순서가 올바른 것은?   
+
+a. 기본값-명시적초기화-초기화블럭-생성자
\ No newline at end of file
diff --git a/src/jeondabeen/report6/Report6_7.md b/src/jeondabeen/report6/Report6_7.md
new file mode 100644
index 0000000..3886d43
--- /dev/null
+++ b/src/jeondabeen/report6/Report6_7.md
@@ -0,0 +1,8 @@
+6-14. 다음 중 지역변수에 대한 설명으로 옳지 않은 것은? (모두 고르시오)   
+
+a. 자동 초기화되므로 별도의 초기화가 필요없다.   
+=> 자바에서는 지역변수를 수동 초기화 해야한다.
+
+e. 힙(heap)영역에 생성되며 가비지 컬렉터에 의해 소멸된다.   
+=> 힙 영역은 인스턴스가 생성되는 곳. 인스턴스 변수가 이 곳에 생성된다.
+   지역변수는 call stack에 생성된다.
\ No newline at end of file
diff --git a/src/jeondabeen/report6/Report6_8.md b/src/jeondabeen/report6/Report6_8.md
new file mode 100644
index 0000000..a8e2445
--- /dev/null
+++ b/src/jeondabeen/report6/Report6_8.md
@@ -0,0 +1,4 @@
+6-15. 호출스택이 다음과 같은 상황일 때 옳지 않은 설명은? (모두 고르시오)   
+
+b. println메서드를 제외한 나머지 메서드들은 모두 종료된 상태이다.   
+=> 다른 메서드들은 잠시 중지된 상태이다.
\ No newline at end of file
diff --git a/src/jeondabeen/report6/Report6_9.md b/src/jeondabeen/report6/Report6_9.md
new file mode 100644
index 0000000..520eb9c
--- /dev/null
+++ b/src/jeondabeen/report6/Report6_9.md
@@ -0,0 +1,17 @@
+//6-16. 다음 코드의 실행 결과를 예측하여 적어주세요.
+```java
+class Exercise6_16 {
+    public static void change(String str) {
+    str += "456";
+    }
+
+    public static void main(String[] args) {
+        String str = "ABC123";
+        System.out.println(str);
+        change(str);
+        System.out.println("After change:" + str);
+    }
+}
+```
+ABC123  
+After change:ABC123456 
\ No newline at end of file
diff --git a/src/jeondabeen/report7/Report7_1.java b/src/jeondabeen/report7/Report7_1.java
new file mode 100644
index 0000000..3301829
--- /dev/null
+++ b/src/jeondabeen/report7/Report7_1.java
@@ -0,0 +1,2 @@
+package jeondabeen.report7;public class Report7_1 {
+}
diff --git a/src/jeondabeen/report7/Report7_2.java b/src/jeondabeen/report7/Report7_2.java
new file mode 100644
index 0000000..2fc45b8
--- /dev/null
+++ b/src/jeondabeen/report7/Report7_2.java
@@ -0,0 +1,2 @@
+package jeondabeen.report7;public class Report7_2 {
+}

From fd90bac0fe2e33a2465c8b2d7bed0139a7628d99 Mon Sep 17 00:00:00 2001
From: jan <samjan1127@gmail.com>
Date: Wed, 25 Jan 2023 10:21:35 +0900
Subject: [PATCH 7/8] add: report7

---
 src/jeondabeen/report7/Report7_1.java | 23 +++++++++-
 src/jeondabeen/report7/Report7_2.java | 20 ++++++++-
 src/jeondabeen/report7/Report7_3.java | 60 +++++++++++++++++++++++++++
 src/jeondabeen/report7/Report7_4.java | 24 +++++++++++
 src/jeondabeen/report7/Report7_5.java | 17 ++++++++
 5 files changed, 142 insertions(+), 2 deletions(-)
 create mode 100644 src/jeondabeen/report7/Report7_3.java
 create mode 100644 src/jeondabeen/report7/Report7_4.java
 create mode 100644 src/jeondabeen/report7/Report7_5.java

diff --git a/src/jeondabeen/report7/Report7_1.java b/src/jeondabeen/report7/Report7_1.java
index 3301829..bcea22b 100644
--- a/src/jeondabeen/report7/Report7_1.java
+++ b/src/jeondabeen/report7/Report7_1.java
@@ -1,2 +1,23 @@
-package jeondabeen.report7;public class Report7_1 {
+package jeondabeen.report7;
+
+public class Report7_1 {
+    static int[] shuffle(int[] arr) {
+        for (int i = 0; i < arr.length; i++) {
+            int j = (int) (Math.random() * arr.length);
+
+            int tmp = arr[i];
+            arr[i] = arr[j];
+            arr[j] = tmp;
+        }
+
+        return arr;
+    }
+
+    public static void main(String[] args) {
+        int[] original = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        System.out.println(java.util.Arrays.toString(original));
+
+        int[] result = shuffle(original);
+        System.out.println(java.util.Arrays.toString(result));
+    }
 }
diff --git a/src/jeondabeen/report7/Report7_2.java b/src/jeondabeen/report7/Report7_2.java
index 2fc45b8..7e85eda 100644
--- a/src/jeondabeen/report7/Report7_2.java
+++ b/src/jeondabeen/report7/Report7_2.java
@@ -1,2 +1,20 @@
-package jeondabeen.report7;public class Report7_2 {
+package jeondabeen.report7;
+
+public class Report7_2 {
+    static boolean isNumber(String str) {
+        for (int i = 0; i < str.length(); i++) {
+            if (!(str.charAt(i) >= '0' && str.charAt(i) <= '9')) return false;
+        }
+
+        return true;
+    }
+
+
+    public static void main(String[] args) {
+        String str = "123";
+        System.out.println(str + " 는 숫자입니까? " + isNumber(str));
+        str = "1234o";
+        System.out.println(str + " 는 숫자입니까? " + isNumber(str));
+    }
+    //예상 결과 : 123는 숫자입니까? true, 1234o는 숫자입니까? false
 }
diff --git a/src/jeondabeen/report7/Report7_3.java b/src/jeondabeen/report7/Report7_3.java
new file mode 100644
index 0000000..495fc66
--- /dev/null
+++ b/src/jeondabeen/report7/Report7_3.java
@@ -0,0 +1,60 @@
+package jeondabeen.report7;
+
+class MyTv {
+    boolean isPowerOn;
+    int channel;
+    int volume;
+    final int MAX_VOLUME = 100;
+    final int MIN_VOLUME = 0;
+    final int MAX_CHANNEL = 100;
+    final int MIN_CHANNEL = 1;
+    void turnOnOff() {
+        // (1) isPowerOn의 값이 true면 false로, false면 true로 바꾼다.
+        isPowerOn = !isPowerOn;
+    }
+    void volumeUp() {
+        // (2) volume의 값이 MAX_VOLUME보다 작을 때만 값을 1 증가시킨다.
+        if (volume < MAX_VOLUME) volume++;
+    }
+    void volumeDown() {
+        // (3) volume의 값이 MIN_VOLUME보다 클 때만 값을 1 감소시킨다.
+        if (volume > MIN_VOLUME) volume--;
+    }
+    void channelUp() {
+        // (4) channel의 값을 1 증가시킨다.
+        // 만일 channel이 MAX_CHANNEL이면 , channel의 값을 MIN_CHANNEL로 바꾼다.
+        if (channel == MAX_CHANNEL) {
+            channel = MIN_CHANNEL;
+            return;
+        }
+
+        channel++;
+    }
+    void channelDown() {
+        // (5) channel의 값을 1 감소시킨다 .
+        // 만일 channel이 MIN_CHANNEL이면, channel의 값을 MAX_CHANNEL로 바꾼다.
+        if (channel == MIN_CHANNEL) {
+            channel = MAX_CHANNEL;
+            return;
+        }
+
+        channel--;
+    }
+}
+
+public class Report7_3 {
+    public static void main(String args[]) {
+        MyTv t = new MyTv();
+        t.channel = 100;
+        t.volume = 0;
+        System.out.println("CH:" + t.channel + ", VOL:" + t.volume);
+        t.channelDown();
+        t.volumeDown();
+        System.out.println("CH:" + t.channel + ", VOL:" + t.volume);
+        t.volume = 100;
+        t.channelUp();
+        t.volumeUp();
+        System.out.println("CH:" + t.channel + ", VOL:" + t.volume);
+    }
+    //예상 결과 : CH: 100, VOL: 0 / CH: 99, VOL: 0 / CH: 100, VOL: 100
+}
diff --git a/src/jeondabeen/report7/Report7_4.java b/src/jeondabeen/report7/Report7_4.java
new file mode 100644
index 0000000..0972644
--- /dev/null
+++ b/src/jeondabeen/report7/Report7_4.java
@@ -0,0 +1,24 @@
+package jeondabeen.report7;
+
+public class Report7_4 {
+    static int max(int[] arr) {
+        int result = 0;
+
+        if (arr == null || arr.length == 0) return -999999;
+
+        for (int num : arr) {
+            if (num > result) result = num;
+        }
+
+        return result;
+    }
+
+    public static void main(String[] args) {
+        int[] data = {3,2,9,4,7};
+        System.out.println(java.util.Arrays.toString(data));
+        System.out.println("최대값 :"+max(data));
+        System.out.println("최대값 :"+max(null));
+        System.out.println("최대값  :"+max(new int[]{})); // 크기가 0인 배열  }
+    }
+    //예상 결과 : 최대값: 9 / 최대값: -99999 최대값: -999999
+}
diff --git a/src/jeondabeen/report7/Report7_5.java b/src/jeondabeen/report7/Report7_5.java
new file mode 100644
index 0000000..29b4e48
--- /dev/null
+++ b/src/jeondabeen/report7/Report7_5.java
@@ -0,0 +1,17 @@
+package jeondabeen.report7;
+
+public class Report7_5 {
+    static int abs(int value) {
+        if (value < 0) value *= -1;
+
+        return value;
+    }
+
+    public static void main(String[] args) {
+        int value = 5;
+        System.out.println(value + "의 절대값 :" + abs(value));
+        value = -10;
+        System.out.println(value + "의 절대값 :" + abs(value));
+    }
+    //예상 결과 : 5의 절대값 : 5 / -10의 절대값 : 10
+}

From 7e0c5eb7ac575f5ea9c375b7bd61ed71624cbd92 Mon Sep 17 00:00:00 2001
From: jan <samjan1127@gmail.com>
Date: Wed, 25 Jan 2023 20:40:41 +0900
Subject: [PATCH 8/8] add: report8

---
 src/jeondabeen/report8/Report8_1.java | 54 +++++++++++++++++
 src/jeondabeen/report8/Report8_2.java | 86 +++++++++++++++++++++++++++
 src/jeondabeen/report8/Report8_3.java | 34 +++++++++++
 src/jeondabeen/report8/Report8_4.java | 50 ++++++++++++++++
 src/jeondabeen/report8/Report8_5.java | 63 ++++++++++++++++++++
 5 files changed, 287 insertions(+)
 create mode 100644 src/jeondabeen/report8/Report8_1.java
 create mode 100644 src/jeondabeen/report8/Report8_2.java
 create mode 100644 src/jeondabeen/report8/Report8_3.java
 create mode 100644 src/jeondabeen/report8/Report8_4.java
 create mode 100644 src/jeondabeen/report8/Report8_5.java

diff --git a/src/jeondabeen/report8/Report8_1.java b/src/jeondabeen/report8/Report8_1.java
new file mode 100644
index 0000000..5b5597a
--- /dev/null
+++ b/src/jeondabeen/report8/Report8_1.java
@@ -0,0 +1,54 @@
+package jeondabeen.report8;
+
+class SutdaDeck {
+    final int CARD_NUM = 20;
+    SutdaCard[] cards = new SutdaCard[CARD_NUM];
+
+    SutdaDeck() {
+        // (구현) 배열 SutdaCard를 적절히 초기화 하시오.
+        for (int i = 0; i < cards.length; i++) {
+            if (i >= 10) {
+                boolean isKwang = false;
+
+                if (i == 10 || i == 12 || i == 17) isKwang = !(cards[i - 10].isKwang);
+
+                cards[i] = new SutdaCard(i + 1 - 10, isKwang);
+            } else {
+                boolean isKwang = false;
+
+                if (i == 0 || i == 2 || i == 7) isKwang = (int) (Math.random() * 2) != 0;
+
+                cards[i] = new SutdaCard(i + 1, isKwang);
+            }
+        }
+    }
+}
+
+class SutdaCard {
+    int num;
+    boolean isKwang;
+
+    SutdaCard() {
+        this(1, true);
+    }
+
+    SutdaCard(int num, boolean isKwang) {
+        this.num = num;
+        this.isKwang = isKwang;
+    }
+
+    // info()대신 Object클래스의 toString()을 오버라이딩했다. 
+    public String toString() {
+        return num + ( isKwang ? "K":"");
+    }
+}
+
+class Report8_1 {
+    public static void main(String args[]) {
+        SutdaDeck deck = new SutdaDeck();
+
+        for (int i = 0; i < deck.cards.length; i++)
+            System.out.print(deck.cards[i] + ",");
+    }
+}
+// 예상결과) 1K,2,3K,4,5,6,7,8K,9,10,1,2,3,4,5,6,7,8,9,10,
diff --git a/src/jeondabeen/report8/Report8_2.java b/src/jeondabeen/report8/Report8_2.java
new file mode 100644
index 0000000..7806d8f
--- /dev/null
+++ b/src/jeondabeen/report8/Report8_2.java
@@ -0,0 +1,86 @@
+package jeondabeen.report8;
+
+class SutdaDeck2 {
+    final int CARD_NUM = 20;
+    SutdaCard2[] cards = new SutdaCard2[CARD_NUM];
+
+    SutdaDeck2() {
+        for (int i = 0; i < cards.length; i++) {
+            if (i >= 10) {
+                boolean isKwang = false;
+
+                if (i == 10 || i == 12 || i == 17) isKwang = !(cards[i - 10].isKwang);
+
+                cards[i] = new SutdaCard2(i + 1 - 10, isKwang);
+            } else {
+                boolean isKwang = false;
+
+                if (i == 0 || i == 2 || i == 7) isKwang = (int) (Math.random() * 2) != 0;
+
+                cards[i] = new SutdaCard2(i + 1, isKwang);
+            }
+        }
+    }
+
+    void shuffle() {
+        // (구현)
+        for (int i = 0; i < cards.length; i++) {
+            int j = (int) (Math.random() * cards.length);
+
+            SutdaCard2 tmp = new SutdaCard2();
+            tmp = cards[i];
+            cards[i] = cards[j];
+            cards[j] = tmp;
+        }
+    }
+
+    SutdaCard2 pick(int index) {
+        // (구현)
+        return cards[index];
+    }
+
+    SutdaCard2 pick() {
+        // (구현)
+        int index = (int) (Math.random() * cards.length);
+        return cards[index];
+    }
+} // SutdaDeck
+
+class SutdaCard2 {
+    int num;
+    boolean isKwang;
+
+    SutdaCard2() {
+        this(1, true);
+    }
+
+    SutdaCard2(int num, boolean isKwang) {
+        this.num = num;
+        this.isKwang = isKwang;
+    }
+
+    public String toString() {
+        return num + ( isKwang ? "K":"");
+    }
+}
+
+class Report8_2 {
+    public static void main(String args[]) {
+        SutdaDeck2 deck = new SutdaDeck2();
+
+        System.out.println(deck.pick(0));
+        System.out.println(deck.pick());
+        deck.shuffle();
+
+        for(int i=0; i < deck.cards.length;i++)
+            System.out.print(deck.cards[i]+",");
+
+        System.out.println();
+        System.out.println(deck.pick(0));
+    }
+}
+//예상결과)
+// 1K
+// 7
+// 2,6,10,1K,7,3,10,5,7,8,5,1,2,9,6,9,4,8K,4,3K,
+// 2
diff --git a/src/jeondabeen/report8/Report8_3.java b/src/jeondabeen/report8/Report8_3.java
new file mode 100644
index 0000000..fec5a15
--- /dev/null
+++ b/src/jeondabeen/report8/Report8_3.java
@@ -0,0 +1,34 @@
+package jeondabeen.report8;
+
+class Product {
+    int price; // 제품의 가격
+    int bonusPoint; // 제품구매 시 제공하는 보너스점수
+
+    // (구현)
+    Product() {
+    }
+
+    Product(int price) {
+        this.price = price;
+        bonusPoint = (int) (price / 10.0);
+    }
+}
+
+class Tv extends Product {
+    Tv() {
+        // 자식 클래스 생성자에 부모 생성자 호출이 되어있지 않다면
+        // 컴파일러가 자동으로 super()를 맨 윗 줄에 추가해주는데
+        // 부모의 기본 생성자가 없고 매개변수를 필요로 하는 생성자만 존재해
+        // 인자를 넘겨주지 못해 발생하는 Error다!
+    }
+
+    public String toString() {
+        return "Tv";
+    }
+}
+
+class Report8_3 {
+    public static void main(String[] args) {
+        Tv t = new Tv();
+    }
+}
diff --git a/src/jeondabeen/report8/Report8_4.java b/src/jeondabeen/report8/Report8_4.java
new file mode 100644
index 0000000..75467ef
--- /dev/null
+++ b/src/jeondabeen/report8/Report8_4.java
@@ -0,0 +1,50 @@
+package jeondabeen.report8;
+
+class MyTv {
+    private boolean isPowerOn;
+    private int channel;
+    private int volume;
+
+    final int MAX_VOLUME = 100;
+    final int MIN_VOLUME = 0;
+    final int MAX_CHANNEL = 100;
+    final int MIN_CHANNEL = 1;
+
+    // (구현)
+
+    public boolean isPowerOn() {
+        return isPowerOn;
+    }
+
+    public void setPowerOn(boolean isPowerOn) {
+        this.isPowerOn = isPowerOn;
+    }
+
+    public int getChannel() {
+        return channel;
+    }
+
+    public void setChannel(int channel) {
+        this.channel = channel;
+    }
+
+    public int getVolume() {
+        return volume;
+    }
+
+    public void setVolume(int volume) {
+        this.volume = volume;
+    }
+}
+
+class Report8_4 {
+    public static void main(String args[]) {
+        MyTv t = new MyTv();
+
+        t.setChannel(10);
+        System.out.println("CH:" + t.getChannel());
+        t.setVolume(20);
+        System.out.println("VOL:" + t.getVolume());
+    }
+}
+//예상결과) CH:10 VOL:20
diff --git a/src/jeondabeen/report8/Report8_5.java b/src/jeondabeen/report8/Report8_5.java
new file mode 100644
index 0000000..81bdf83
--- /dev/null
+++ b/src/jeondabeen/report8/Report8_5.java
@@ -0,0 +1,63 @@
+package jeondabeen.report8;
+
+class MyTv2 {
+    private boolean isPowerOn;
+    private int channel;
+    private int volume;
+    private int prevChannel;
+    // (구현)
+
+    final int MAX_VOLUME = 100;
+    final int MIN_VOLUME = 0;
+    final int MAX_CHANNEL = 100;
+    final int MIN_CHANNEL = 1;
+
+    public void setVolume(int volume) {
+        if (volume > MAX_VOLUME || volume < MIN_VOLUME)
+            return;
+        this.volume = volume;
+    }
+
+    public int getVolume() {
+        return volume;
+    }
+
+    public void setChannel(int channel) {
+        if (channel > MAX_CHANNEL || channel < MIN_CHANNEL)
+            return;
+
+        // (구현)
+        prevChannel = this.channel;
+        this.channel = channel;
+    }
+
+    public int getChannel() {
+        return channel;
+    }
+
+    // (구현)
+    public void gotoPrevChannel() {
+        int tmp = channel;
+        channel = prevChannel;
+        prevChannel = tmp;
+    }
+}
+
+class Report8_5 {
+    public static void main(String args[]) {
+        MyTv2 t = new MyTv2();
+        t.setChannel(10);
+        System.out.println("CH:" + t.getChannel());
+        t.setChannel(20);
+        System.out.println("CH:" + t.getChannel());
+        t.gotoPrevChannel();
+        System.out.println("CH:" + t.getChannel());
+        t.gotoPrevChannel();
+        System.out.println("CH:" + t.getChannel());
+    }
+}
+
+// CH:10
+// CH:20
+// CH:10
+// CH:20