reference semantics

#include<stdio.h>

void swap(int* a, int* b)
{
    int tmp = *a;
    *a = *b;
    *b = tmp;
}

int main(int argc, char** argv)
{
   int i = 0;
   int j = 1;
   swap(&i,&j);

   printf("i is %d, j is %d", i, j); return 0;
}