K+R Exercise4_14

#include <stdio.h>

#define swap(t,x,y) {  t _z;\
                      _z = x;\
                       x = y;\
                       y = _z;}

/* Print the input line */
int main()
{
    int x=5;
    int y=6;
    swap(int,x,y);
    printf("x = %d\ny = %d\n",x,y);
    return(0);
}