/*-------------------------------------------------------------------*/
/* stack.c (Version 2: Function Modules)                             */
/*-------------------------------------------------------------------*/

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

void Stack_push(double pdStackArray[], int *piStackTop, 
                int iMaxStackSize, double dItem)
/* Push dItem onto the top of the stack represented by pdStackArray
   and piStackTop.  iMaxStackSize indicates the maximum number of 
   items that the stack can contain. */
{
   assert(pdStackArray != NULL);
   assert(piStackTop != NULL);
   assert(*piStackTop >= 0);
   assert(*piStackTop < iMaxStackSize);
   pdStackArray[*piStackTop] = dItem;
   ++*piStackTop;
}

double Stack_pop(double pdStackArray[], int *piStackTop)
/* Pop and return the top item from the stack represented by 
   pdStackArray and piStackTop. */
{
   assert(pdStackArray != NULL);
   assert(piStackTop != NULL);
   assert(*piStackTop > 0);
   --*piStackTop;
   return pdStackArray[*piStackTop];
}