通过键盘输入两个整形数分别存放在变量x,y中不借用第三个变量，实现x,y值的互换。（刚学c语言，请问怎么做?)

#include <stdio.h>

int main(int argc, char *argv[])
{
    int x, y;
    long int t;
#define V_DBG
#ifndef V_DBG
    /* scanf("%d%d\n", &x, &y); */
#else
    x = 1; y = 25;
#endif
    //print
    printf("org:\t\t\tx = %d, y = %d\n", x, y);
    //print->swap
    printf("print->swap:\t\tx = %d, y = %d\n", y, x);
    //value->swap
    t = x; x = y; y = t;
    printf("value->swap:\t\tx = %d, y = %d\n", x, y);
    //ptr->swap
    t = (long int)&x;
    ((long int *)t)[0] = 0x0000001900000001;
    printf("ptr->swap:\t\tx = %d, y = %d\n", x, y);
    //arithmetic->swap /* caution: overflow risk */
    x += y; y = x - y; x -= y;
    printf("arithmetic->swap:\tx = %d, y = %d\n", x, y);
    //xor->swap /* caution: overflow risk */
    x ^= y; y ^= x; x ^= y;
    printf("xor->swap:\t\tx = %d, y = %d\n", x, y);
   
    return 0;
}