c program to add two numbers without using third variable

Write a c program to add two Numbers without using Third variable..

PROGRAM:

#include<stdio.h>

int main()

{

     int x,y;

     printf(" ***PROGRAM TO ADD TWO NUMBERS WITHOUT USING

                THIRD VARIABLE*** ");

     printf("\n Enter the first number to be added: ");

     scanf("%d",&x);         /* taking x value from keyboard*/

     printf("\n Enter the second number to be added: ");

     scanf("%d",&y);         /* taking y value from keyboard*/

     x = x + y;     /*assining the value of sum of x and y to x*/

     printf("\n The sum of two numbers is: %d\n",x);    /*printing the sum.*/

     return 0;

}

Sample Output: ( using GNU GCC Compiler with Code Blocks IDE )
  Enter the first number to be added: 15
  Enter the second number to be added: 5
  The sum of two numbers is: 20


For c# Program:

C# Program To Add Two Numbers/Integers without using Third Variable