#include <stdio.h>
void huhuan(int a,int b){
    int t;
  t = a;
a = b;
b = t;
return ;
}
int main (void) {
int a = 3;
int b = 2;
huhuan(a,b);

    printf("a = %d b = %d",a,b);
    return 0;
}