Question

WAP using a function void swap(int n1, int n2) to swap the numbers stored in n1 and n2 without using a third variable. Print the numbers before and after interchange.

Answer 1

SOLUTION.

The given co‎‎‎‎‎‎de is written in Java.

import java.util.*;

public class SwapNumbers{

   void swap(int n1,int n2){

       System.out.println("Before Swapping - ");

       System.out.println("n1 = "+n1);

       System.out.println("n2 = "+n2);

       n1+=n2;

       n2=n1-n2;

       n1-=n2;

       System.out.println("After Swapping - ");

       System.out.println("n1 = "+n1);

       System.out.println("n2 = "+n2);

   }

   public static void main(String s[]){

       Scanner _=new Scanner(System.in);

       System.out.print("Enter first number: ");

       int a=_.nextInt();

       System.out.print("Enter second number: ");

       int b=_.nextInt();

       (new SwapNumbers()).swap(a,b);

   }

}

SAMPLE I/O.

Enter first number: 10

Enter second number: 20

Before Swapping -  

n1 = 10

n2 = 20

After Swapping -  

n1 = 20

n2 = 10

See attachment for verification.