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

#define MAXVAL 100 /* maximum depth of val stack */

int sp = 0;           /* next free stack position */
double val[MAXVAL]; /* value stack */

/* push: push f onto value stack */
void push(double f)
{

  if (sp < MAXVAL)
    val[sp++] = f;
  else
    fprintf(stderr,"error: pila llena %g\n", f);
}

/* pop: pop and return top value from stack */
double pop(void)
{  
  if (sp > 0)
    return val[--sp];
  else {
    fprintf(stderr,"error: pila vacia\n");
    return 0.0;
  }
}

void ClearStack(void)
{
	sp=0;
	puts("Pila vaciada");
}

void PrintStack(void)
{
	int i=sp;
	
	while(i) printf(FORMATO_F,val[--i]);
}