done

index.js

@@ -0,0 +1,109 @@
+import java.util.Scanner;
+
+public class Main {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        boolean continueLoop = true;
+
+        while (continueLoop) {
+            System.out.println("pls select the task you want to lunch 1--task1 , 2--task2 , 3--task3 or q to quit. ");
+            String selectedTask = scanner.next();
+            switch (selectedTask) {
+                case "1":
+                    System.out.println("executing task1");
+                    task1();
+                break;
+                case "2":
+                    System.out.println("executing task2");
+                    task2();
+                    break;
+
+                case "3":
+                    System.out.println("executing task3");
+                    double x = 5.0;
+                    double y = 3.0;
+                    double sum = xyExpression(x, y);
+                    System.out.println("The result is: " + sum);
+                    break;
+                case "q":
+                case "Q":
+                    System.out.println("quitting...");
+                    continueLoop = false;
+                    break;
+                default:
+                    System.out.println("Invalid selection. Please enter 1, 2, 3, or q to quit.");
+                    break;
+            }
+        }
+    scanner.close();
+    }
+
+public static void task1() {
+        int[] arrayNumbers = {  7, 12, -4,  5,  6, 14,  8};
+        int largestNumber =arrayNumbers[0];
+        int smallestNumber =arrayNumbers[0];
+
+
+        for (int i = 1; i < arrayNumbers.length; i++) {
+            if (arrayNumbers[i] > largestNumber) {
+                largestNumber = arrayNumbers[i];
+                ;
+            }
+            if (arrayNumbers[i] < smallestNumber) {
+                smallestNumber = arrayNumbers[i];
+
+            }
+        }
+
+        System.out.println("largest Number: " + largestNumber);
+        System.out.println("smallest Number is: " + smallestNumber);
+
+        double difference = largestNumber - smallestNumber ;
+        System.out.println("the difference is " + difference);
+
+
+}
+
+public static void task2() {
+
+        int[] arrayNumbers = {  7, 12, -4,  5,  6, 14,  8};
+        int smallest = Integer.MAX_VALUE;
+        int secondSmallest  =Integer.MAX_VALUE;
+
+
+        for (int number : arrayNumbers  ) {
+            if (number  < smallest ) {
+                secondSmallest  = smallest ;
+                smallest = number ;
+            } else if (number < secondSmallest && number != smallest ){
+                secondSmallest = number;
+            }
+
+        }
+        System.out.println("smalest value " + smallest) ;
+        System.out.println(" second smallest value  " + secondSmallest);
+
+
+    }
+
+//    Task3 
+    public static double xyExpression (double x, double y) {
+
+        double xExpression = Math.pow(x, 2);
+
+
+        double yExpression = (4.0 * y / 5.0) - x;
+
+
+        double xSquared = Math.pow(yExpression, 2);
+
+
+        double result = xExpression + xSquared;
+
+        return result;
+
+
+
+    }
+
+}