HW3

src/homework3/Main.java

@@ -3,6 +3,206 @@
 public class Main {
 
     public static void main(String[] args) {
-	// write your code here
+
+        System.out.println(" Example1 ");
+        Example1();
+
+        System.out.println(" Example2 ");
+        Example2();
+
+        System.out.println(" Example3 ");
+        Example3();
+
+        System.out.println(" Example4 ");
+        Example4(5);
+
+        System.out.println(" Example5 ");
+        int arr_example5[] = Example5(4, 9);
+
+        for (int i = 0; i < arr_example5.length; i++) {
+            System.out.printf("%4d", arr_example5[i]);
+        }
+        System.out.println();
+
+        System.out.println(" Example6 ");
+
+
+        System.out.println(" Example7 ");
+        Example7(new int[] {2, 2, 2, 1, 2, 2, 10, 1});
+        Example7(new int[] {1, 1, 1, 2, 1});
+        Example7(new int[] {7, 1, 1, 2, 1});
+
+        System.out.println(" Example8 ");
+        Example8(new int[] {1, 2, 3, 4, 5, 6, 7, 8}, 0);
+        Example8(new int[] {1, 2, 3, 4, 5, 6, 7, 8}, 2);
+        Example8(new int[] {1, 2, 3, 4, 5, 6, 7, 8}, -3);
+
+    }
+
+    static public void Example1() {
+        int arr[] = new int[] {1, 1, 0, 0, 1, 0, 1, 1, 0, 0};
+        for (int i = 0; i < arr.length; i++){
+            if (arr[i] == 0) {
+                arr[i] = 1;
+            } else if (arr[i] == 1) {
+                arr[i] = 0;
+            }
+
+            System.out.printf("%2d", arr[i]);
+        }
+        System.out.println();
     }
+
+    static public void Example2() {
+        int arr[] = new int[100];
+
+        for (int i = 0; i < arr.length; i++){
+            arr[i] = i+1;
+        }
+
+        for (int i = 0; i < arr.length; i++) {
+            System.out.printf("%4d", arr[i]);
+        }
+        System.out.println();
+    };
+
+    static public void Example3() {
+        int arr[] = new int[] {1, 5, 3, 2, 11, 4, 5, 2, 4, 8, 9, 1};
+        for (int i = 0; i < arr.length; i++){
+            if (arr[i] < 6) {
+                arr[i] *= 2;
+            }
+        }
+        for (int i = 0; i < arr.length; i++) {
+            System.out.printf("%4d", arr[i]);
+        }
+        System.out.println();
+    }
+
+    static public void Example4(int NumberOfElements) {
+        int double_arr[][] = new int[NumberOfElements][NumberOfElements];
+
+        for (int i = 0; i < double_arr.length; i++){
+            double_arr[i][i] = 1;
+            double_arr[i][NumberOfElements-i-1] = 1;
+        }
+        for (int i = 0; i < double_arr.length; i++) {
+            for (int j = 0; j < double_arr[i].length; j++) {
+                System.out.printf("%2d", double_arr[i][j]);
+            }
+            System.out.println();
+        }
+    }
+
+    public static int[] Example5(int len, int initialValue) {
+
+        int arr[] = new int[len];
+
+        for (int i = 0; i < arr.length; i++) {
+            arr[i] = initialValue;
+        }
+        return arr;
+    }
+
+
+
+
+    public static void Example7 (int arr[]){
+
+        int leftSideSumm = 0;
+        int rightSideSumm = 0;
+        boolean result = false;
+        int foundIteration = 0;
+
+        for (int i = 0;  i < arr.length - 1; i++){
+            leftSideSumm +=  arr[i];
+            for (int j = arr.length - 1; j > i; j--){
+                rightSideSumm += arr[j];
+            }
+            if (leftSideSumm == rightSideSumm){
+                result = true;
+                foundIteration = i;
+                break;
+            }
+            rightSideSumm = 0;
+        }
+
+        if (result == false){
+            System.out.println("Результат не найден!");
+        }
+        else{
+            System.out.println("Результат найден!");
+            for (int i = 0; i < arr.length; i++){
+                if (i == foundIteration){
+                    System.out.print(arr[i] + " = ");
+                }
+                else if (i == arr.length - 1){
+                    System.out.print(arr[i]);
+                }
+                else {
+                    System.out.print(arr[i] + " + ");
+                }
+            }
+        }
+        System.out.println();
+    }
+
+
+    public static void Example8 (int arr[],int n){
+
+        int savedValue;
+
+        for (int i = 0; i < arr.length; i++) {
+            System.out.printf("%4d", arr[i]);
+        }
+
+        if (n > 0) {
+
+            for (int i = 0; i < n; i++){
+                savedValue = arr[arr.length-1];
+                for (int j = arr.length-1; j > 0; j--){
+                    arr[j] = arr[j-1];
+                }
+                arr[0] = savedValue;
+            }
+
+            System.out.print(" => ");
+
+
+            for (int i = 0; i < arr.length; i++) {
+                System.out.printf("%4d", arr[i]);
+            }
+
+        }
+        else if (n < 0) {
+
+            for (int i = 0; i > n; i--){
+                savedValue = arr[0];
+                for (int j = 0; j < arr.length-1; j++){
+                    arr[j] = arr[j+1];
+                }
+                arr[arr.length-1] = savedValue;
+            }
+
+            System.out.print(" => ");
+
+            for (int i = 0; i < arr.length; i++) {
+                System.out.printf("%4d", arr[i]);
+            }
+
+        }
+        else{
+            System.out.print(" => ");
+
+
+            for (int i = 0; i < arr.length; i++) {
+                System.out.printf("%4d", arr[i]);
+            }
+            System.out.println();
+            System.out.println("При значении n = 0 массив не изменяется!");
+        }
+        System.out.println();
+    }
+
 }
+