c program to swap two integers without using temporary variable

#include<stdio.h>
#include<conio.h>

void main()
{
int x, y;

printf("Enter the value of x and y ");
scanf("%d%d",&x, &y);

printf("Before Swapping\nx = %d\ny = %d\n",x,y);

x = x+y;
y = x-y;
x = x-y;
printf("After Swapping\nx = %d\ny = %d\n",x,y);
getch();
}