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


#define MAXVAL	100

static int sp = 0;
static double val[MAXVAL];


void push(double f)
{
  if (sp < MAXVAL) {
    val[sp++] = f;
  }else{
    printf("error: stack full, can't push %g\n", f);
  }/*endif*/
}


double pop(void)
{
  if (sp>0) {
    return val[--sp];
  }else{
    printf("error: stack empty\n");
    return 0.0;
  }/*endif*/
}