Write a C program to Swap two numbers without third variable.

#include <stdio.h>

void main()

{

   int a, b;

  printf("Enter two integers to swap\n");

   scanf("%d%d", &a, &b);

   a = a + b;

   b = a - b;

   a = a - b;

   printf("a = %d\nb = %d\n",a,b);

}