演習 8-3

#include <stdio.h>
#define swap(int, x, y) z = x; x = y; y = z;

int main(){

int x, y, z;

printf("整数ｘ："); scanf("%d", &x);
printf("整数ｙ："); scanf("%d", &y);

swap(int, x, y);

printf("x = %d, y = %d\n", x, y);

return 0;
}