C_PRG_LANG_EX_4.14

#include <stdio.h>

#define SWAP(type, x, y){\
type tmp = x;\
x = y;\
y = tmp;\
}

int main(void)
{
    int x = 5;
    int y = 8;
    printf("x = %d, y = %d\n", x, y);
    printf("SWAP\n");
    SWAP(int, x, y);
    printf("x = %d, y = %d\n", x, y);
}