/* test_swap.c             older style of test_swap.cpp */

void swap(int *v1, int *v2)         /* pass by pointer */
{
  int tmp = *v2;
  *v2 = *v1;
  *v1 = tmp;
} /* end swap */


#include <stdio.h>
int main()                     /* C version of test swap */
{
  int i=10;
  int j=20;
  printf("before swap  i= %d  j= %d \n", i, j);
  
  swap(&i,&j);         /* note users call requires & */
  
  printf("after  swap  i= %d  j= %d \n", i, j);
  return 0;
} /* end main */