C Program to Swap Values of 2 Variables Without Using 3rd Variable

/*WAP to swap values of 2 variables without using 3rd variable */

#include<stdio.h>

void main()

{

   int a,b;

   clrscr();

   printf("Enter The Value for A & B\n");

   scanf("%d%d",&a,&b);

   printf("Values Before Swapping A & B \n");

   printf("A=%d \t B=%d \n",a,b);

   a=a+b;

   b=a-b;

   a=a-b;

   printf("Values After Swapping\n ");

   printf("A=%d \t B=%d",a,b);

   getch();

}

OutPut:

Enter The Value for A & B

123

456

Values Before Swapping A & B

A=123    B=456

Values After Swapping

 A=456   B=123