/*------------------------------------------------------------------*/
/* teststack.c (Client of a Generic Stack ADT that Uses Function    */
/*              Pointers)                                           */
/*------------------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>
#include "stack.h"

/*------------------------------------------------------------------*/

static void printString(void *pvItem, void *pvExtra)

/* Print string *pvItem using format pvFormat. */

{
   char *pcItem = (char*)pvItem;
   char *pcFormat = (char*)pvExtra;
   printf(pcFormat, pcItem);
}

/*------------------------------------------------------------------*/

static void sumDouble(void *pvItem, void *pvExtra)

/* Accumulate double *pvItem into *pvExtra. */

{
   double *pdItem = (double*)pvItem;
   double* pdSum = (double*)pvExtra;
   *pdSum += *pdItem;
}

/*------------------------------------------------------------------*/

int main(void)

/* Test the Stack ADT. */

{
   Stack_T oStack1;
   Stack_T oStack2;
   double d1 = 1.1;
   double d2 = 2.2;
   double d3 = 3.3;
   double dSum = 0.0;

   /* Create and use a Stack of strings. */

   oStack1 = Stack_new();

   Stack_push(oStack1, "Ruth");
   Stack_push(oStack1, "Gehrig");
   Stack_push(oStack1, "Mantle");
   Stack_push(oStack1, "Jeter");

   Stack_map(oStack1, printString, "%s\n");
 
   Stack_free(oStack1);

   /* Create and use a Stack of doubles. */

   oStack2 = Stack_new();

   Stack_push(oStack2, &d1);
   Stack_push(oStack2, &d2);
   Stack_push(oStack2, &d3);

   Stack_map(oStack2, sumDouble, &dSum);

   printf("The sum is %g.\n", dSum);

   Stack_free(oStack2);

   return 0;
}