C Program to swap without temp variable

#include <stdio.h>
int main()
{
    int x, y;

    printf("Enter two numbers: ");
    scanf("%d%d", &x, &y);

    printf("Before swap = %d , %d\n", x, y);
    x=x+y;
    y=x-y;
    x=x-y;
    printf("After swap = %d , %d\n", x, y);
    return 0;
}