What is the output of this program? public class Q_07{public static void main {S

Question

What is the output of this program? public class Q_07{public static void main {String[] args} {int x = 2; Switch(x){case 2: x +=1; case 3: x +=2; case 4: x +=3; case 5: x +=4; System.out.println ("x1 =" + x); case 6: x ++; system out.println("x2 =" +x); case 7: x += 4; break; case 8: x--; System out println("x3 ="+x); case 9: x += 3;} System.out.println("x4 =" +x);}} Write a program that searches for a value in an array, if found replaces it with the last element of the array, given the array: int [] values = {23, 78, 14, 56, 90, 101, 32, 34};

Explanation / Answer

9. Output:
x1 = 12
x2 = 13
x4 = 17

Explanation of output:
1. Initially x is 2 when we enter switch statement. It matches with case 2. Hence, x gets incremented by 1. x is now 3.
2. case 2 doesn't have a break statement, hence it executes all cases below it until it finds a break.
3. case 3,4,5 get executed and x gets incremented by 2,3,4 respectively. In total 2+3+4 = 9 gets added to x. x is now 12.
4. Now there's a print statement, so x1 = 12 gets printed.
5. It executes case 6, and x again gets incremented using postfix operator. x is now 13.
6. The print statement is executed, and x2 = 13 gets printed.
7. It goes in case 7 now. Here x gets incremented by 4. x is now 17.
8. It encounters a break statement, hence goes out of switch statement.
9. Finally the print statement outside the break is executed, and x4 = 17 gets printed.

10. Here's the Java code for the same:

import java.util.Scanner;

public class ArrayOp {
  
    int values[] = {23,78,14,56,90,101,32,34};

    public static void main(String[] args) {
        int n;
        Scanner sc = new Scanner(System.in);
        System.out.println("Please enter a value:");
      
       // Number to be found.
        n = sc.nextInt();

       // We need an object of this class to refer to values array in a static context.
        ArrayOp obj = new ArrayOp();
        int i;
      
        for ( i = 0; i < obj.values.length; i++) {

       // If value is found, replace it with last e
            if (obj.values[i] == n) {
                obj.values[i] = obj.values[obj.values.length - 1];
              
                // Optional message to display to user.
                System.out.println("Value found and replaced with last element.");
                break;
            }

        }

        // Optional message to display to user.
        if (i == obj.values.length) {
            System.out.println("Value not found in array.");
        }

        // Print array to test changes. (Optional)
        obj.printArray();
    }

    /**
     * Method to print array values.
     */
    private void printArray() {
        System.out.println("Printing array.");
        for (int i = 0; i < values.length; i++) {
            System.out.print(values[i] + " ");
        }
    }

}

I have tried to answer questions as per my knowledge, in case of any problem let me know.

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