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

void swap(char**v1, char**v2)            /* pass by pointer */
{                             /* note has to be pointer to pointer */
  char* tmp = *v2;            /* in order to swap pointers */
  *v2 = *v1;
  *v1 = tmp;
} /* end swap */


#include <stdio.h>
int main()                 /* C version of test swap str */
{
  char* i="abcdef";
  char* j="ghi";
  printf("before swap  i= %s  j= %s \n", i, j);
  
  swap(&i, &j);           /* note users call needs & */
  
  printf("after  swap  i= %s  j= %s \n", i, j);
  
  return 0;
} /* end main */