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

using namespace std;

int Stac::MAXVAL = 100;

Stac::Stac(){
  _sp = 0;
  _val = new double[MAXVAL];
}

Stac::Stac(int max){
  _sp = 0;
  _val = new double[MAXVAL];
  MAXVAL = max;
}

// copy constructor
Stac::Stac(const Stac& st){
  _sp = st._sp;
  _val = new double[MAXVAL];
  for(int i = 0; i < st._sp; i++)
    _val[i] = st._val[i];
}

Stac::~Stac(){
  delete[] _val;
}

// push: push f onto value stack
void Stac::push(double f){
  if(_sp < MAXVAL)
    _val[_sp++] = f;
  else
    cerr << "error: stack full, can't push\n";
}

// pop: pop and return top value from stack
double Stac::pop(void){
  if(_sp > 0)
    return _val[--_sp];
  else{
    cerr << "error: stack empty\n";
    return 0.0;
  }
}

void Stac::maxval(int max){
  MAXVAL = max;
  cout << "value of MAXVAL: " << MAXVAL << endl;
}

void Stac::maxval(void){
  cout << "value of MAXVAL: " << MAXVAL << endl;
}