#include <stdio.h>
int main()
{
int a,b;
printf("\tEnter Two Numbers\n");
printf("----------------------------\n");
printf("Enter First Number : ");
scanf("%d", &a);
printf("\nEnter Second Number : ");
scanf("%d",&b);
printf("----------------------------\n");
printf("\nBefore Exchange a= %d b=%d\n",a,b);
/*Without using third variable*/
a=a+b;
b=a-b;
a=a-b;
printf("\nAfter Exchange a=%d b=%d",a,b);
return 0;
}