WAP that swaps values of two variables without third variable.

 Here is your code in c:-


#include <stdio.h>

int main()
{
    int n1, n2;
    
    printf("Enter the first number: ");
    
    scanf("%d", &n1);
    
    printf("Enter the Second number: ");
    
    scanf("%d", &n2);
    
    printf("The numbers before swap is n1 = %d and n2 = %d \n", n1, n2);
    
    n1 = n1 + n2;
    n2 = n1 - n2;
    n1 = n1 - n2;
    
    printf("The numbers after swap is n1 = %d and n2 = %d", n1 , n2);

    return 0;
}

 Output:-

Logic Behind Swap:-



In the code:-         n1 = n1 + n2;
                               n2 = n1 - n2;
                               n1 = n1 - n2;

                Let n1 = 10 , n2 = 20;

 

In the first statement n1 = n1 + n2 value of n1 will become 30.

In the second statement n2 = n1 - n2 value of n2 become 30 - 20 = 10 

In the third statement n1 = n1- n2 value of n1 become 30 - 10 = 20

We can see that after this n1 becomes 20 and n2 becomes 10.

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