홍우람 1일차 과제

2주차 클론.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/untitled" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

src/wooramhong/report1/Report1_1

@@ -0,0 +1,6 @@
+2-4번 문제
+
+정답 :byte b = 256; //byte는 -128~127까지임으로 (byte)256이여야함
+            char c = ''; //공백문자의 부재
+            char answer = 'no'; // char는 영단어 하나만
+            float f = 3.14 //함수는 뒤에 f가 붙어야함

src/wooramhong/report1/Report1_2

@@ -0,0 +1,9 @@
+2-7번 번 문제
+
+정답 :  System.out.println("1" + "2"); // 12
+       System.out.println(true + ""); //true
+       System.out.println('A' + 'B'); //131
+       System.out.println('1' + 2); //51
+       System.out.println('1' + '2'); //99
+       System.out.println('J' + "ava"); //Java
+       System.out.println(true + null); //오류

src/studentenglishname/report1/Report1_3.java → src/wooramhong/report1/Report1_3.java

@@ -1,8 +1,17 @@
-package studentenglishname.report1;
+package wooramhong.report1;
 // 2-8 번 문제   <- 이렇게 문제 번호 작성 필수
 public class Report1_3 {
     public static void main(String[] args) {
-        // 정답 작성
+        int x = 1;
+        int y = 2;
+        int z = 3;
+        int temp=0;
+
+        temp=x;
+        x=y;
+        y=z;
+        z=temp;
+
         // Ex)
         AddClass addClass = new AddClass();
         addClass.test();

src/wooramhong/report2/Report2_1

@@ -0,0 +1,5 @@
+3-1번문제
+
+정답 :1. b=(byte)i
+     2. float f = (float)l;
+     3. i = (int)ch

src/wooramhong/report2/Report2_2.java

@@ -0,0 +1,22 @@
+package wooramhong.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 y>=5가 성립하기 때문에
+        System.out.println(y += 10 - x++); //13 x++은 뒤에 적용되기 때문에
+        System.out.println(x += 2); //5 x = x+2와 같은 의미기 때문에
+        System.out.println(!('A' <= c && c <= 'Z')); //false &&으로 두가지가 모두 성립하지 않으면 false
+        System.out.println('C' - c); //2 C의 문자코드가 67
+        System.out.println('5' - '0'); //5 int형으로 변환
+        System.out.println(c + 1); //66 c='A'이고 A의 문자코드는 65 고로 65+1
+        System.out.println(++c); //B c='A'이고 A의 문자코드는 65 거기에 +1을 해 66인 상태로 다시 char로 변환하면 B
+        System.out.println(c++); //B 위에서 B가 되었고, 늦게 더해짐으로
+        System.out.println(c); //C 위에서 늦게나마 +1이 되어서
+
+    }
+}
+

src/wooramhong/report2/Report2_3

@@ -0,0 +1,3 @@
+3-3번 문제
+
+정답: (num/100)*100

src/wooramhong/report2/Report2_4.java

@@ -0,0 +1,11 @@
+package wooramhong.report2;
+//3-4번문제
+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);
+    }
+}

src/wooramhong/report2/Report2_5

@@ -0,0 +1,3 @@
+3-5번 문제
+
+정답:num == 0 ? 0 : num>0? "양수입니다.":"음수입니다"

src/wooramhong/report2/Report2_6.java

@@ -0,0 +1,11 @@
+package wooramhong.report2;
+
+public class Report2_6 {
+    public static void main(String[] args) {
+        int fahrenheit = 100;
+        double celcius = Math.floor(((float)5/9 *(fahrenheit-32))*100) > ((float)5/9 *(fahrenheit-32))*100 -0.5? Math.floor(((float)5/9 *(fahrenheit-32))*100)/100 : Math.floor(((float)5/9 *(fahrenheit-32))*100)/100+0.01;
+
+        System.out.println("Fahrenheit:"+fahrenheit);
+        System.out.println("Celcius:"+celcius);
+    }
+}

src/wooramhong/report3/Report3_1.java

@@ -0,0 +1,61 @@
+package wooramhong.report3;
+
+import java.util.Scanner;
+
+class Report3_1 {
+    public static void main(String[] args) {
+        Scanner scanner=new Scanner(System.in);
+        int x=scanner.nextInt();
+        if (x>10&&20>x) {
+            System.out.println(true);
+        }
+    }
+    public static void main2(String[] args) {
+        char ch= 'A';
+        if (ch != ' ' || ch !='\t') {
+            System.out.println(true);
+        }
+    }
+
+    public static void main3(String[] args) {
+        char ch= 'A';
+        if (ch == 'x' || ch == 'X') {
+            System.out.println(true);
+        }
+    }
+
+    public static void main4(String[] args) {
+        char ch= 'A';
+        if (ch >= '0' && ch <= '9') {
+            System.out.println(true);
+        }
+    }
+
+    public static void main5(String[] args) {
+        char ch= 'A';
+        if (ch >= 'a' && ch <='z' || ch >= 'A' && ch<='Z') {
+            System.out.println(true);
+        }
+    }
+
+    public static void main6(String[] args) {
+        int year=5;
+        if (year % 4== 0 || year % 100 != 0) {
+            System.out.println(true);
+        }
+    }
+
+    public static void main7(String[] args) {
+        boolean powerOn = false;
+        if (powerOn = false) {
+            System.out.println(true);
+        }
+    }
+
+    public static void main8(String[] args) {
+        String str = "yes";
+        if (str == "yes") {
+            System.out.println(true);
+        }
+    }
+}

src/wooramhong/report3/Report3_10.java

@@ -0,0 +1,30 @@
+package wooramhong.report3;
+
+public class Report3_10 {
+    public static void main(String[] args) {
+        // 1~100사이의 임의의 값을 얻어서  answer에 저장한다.
+        int answer = (int)(Math.random()*101);
+        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("정답입니다."+count+"번째에 맞추셨습니다.");
+                break;
+            } else if (input>100) {
+                System.out.println("100 이하의 숫자를 입력하세요");
+            } else if (input<0) {
+                System.out.println("1 이상의 숫자를 입력하세요");
+            }else if (input<answer) {
+                System.out.println("더 높은 숫자입니다.");
+            }else if (input>answer) {
+                System.out.println("더 낮은 숫자입니다.");
+            }
+        } while(true); //무한반복문
+    } // end of main
+}

src/wooramhong/report3/Report3_2.java

@@ -0,0 +1,11 @@
+package wooramhong.report3;
+
+class Report3_2 {
+    public static void main(String[] args) {
+        int sum = 0;
+        for (int i = 0; i < 21; i++) {
+            sum+=i;
+        }
+        System.out.println("sum="+sum);
+    }
+}

src/wooramhong/report3/Report3_3.java

@@ -0,0 +1,15 @@
+package wooramhong.report3;
+
+class Report3_3 {
+    public static void main(String[] args) {
+        int sum = 0;
+        int totalSum = 0;
+        for (int i = 0; i < 11; i++) {
+            for (int j = 0; j < i; j++) {
+                sum+=j;
+            }
+            totalSum+=sum;
+        }
+        System.out.println("totalSum="+totalSum);
+    }
+}

src/wooramhong/report3/Report3_4.java

@@ -0,0 +1,21 @@
+package wooramhong.report3;
+
+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 (s % 2==0) {
+                sum-=s;
+            }
+            else {
+                sum+=s;
+            }
+            s++;
+        }
+        num=s;
+        System.out.println("num="+num);
+        System.out.println("sum="+sum);
+    }
+}

src/wooramhong/report3/Report3_5.java

@@ -0,0 +1,22 @@
+package wooramhong.report3;
+
+class Report3_5 {
+    public static void main(String[] args) {
+//        for (int i = 0; i <= 10; i++) {
+//            for (int j = 0; j <= i; j++)
+//                System.out.print("*");
+//            System.out.println();
+//        }
+        int i=0;
+        int j=0;
+        while(i<=10){
+            i++;
+            j=0;
+            while(j<=i){
+                j++;
+                System.out.print("*");
+            }
+            System.out.println();
+        }
+    }
+}

src/wooramhong/report3/Report3_6.java

@@ -0,0 +1,17 @@
+package wooramhong.report3;
+
+class Report3_6 {
+    public static void main(String[] args) {
+        int[] dice1={1,2,3,4,5,6};
+        int[] dice2={1,2,3,4,5,6};
+
+        for (int i = 0; i < dice1.length; i++) {
+            for (int j = 0; j < dice2.length; j++) {
+                int sum=dice1[i]+dice2[j];
+                if (sum==6) {
+                    System.out.println("첫번쨰 주사위"+dice1[i]+"와 두번째 주사위"+dice2[j]);
+                }
+            }
+        }
+    }
+}

src/wooramhong/report3/Report3_7.java

@@ -0,0 +1,15 @@
+package wooramhong.report3;
+
+class Report3_7 {
+    public static void main(String[] args) {
+        String str = "12345";
+        int sum = 0;
+
+        for (int i = 0; i < str.length(); i++) {
+            char[] chArr = str.toCharArray();
+            sum+=(int)chArr[i]-48;
+        }
+
+        System.out.println("sum=" + sum);
+    }
+}

src/wooramhong/report3/Report3_8.java

@@ -0,0 +1,8 @@
+package wooramhong.report3;
+
+public class Report3_8 {
+    public static void main(String[] args){
+        int value = (int)(Math.random()*6+1);
+        System.out.println("value:"+value);
+    }
+}

src/wooramhong/report3/Report3_9.java

@@ -0,0 +1,13 @@
+package wooramhong.report3;
+
+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);
+    }
+}

src/wooramhong/report3/로그인flow.drawio

@@ -0,0 +1 @@
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