#include "Error.h"
#include "StackError.h"

const int SIZE = 100;

class Stack
{
protected:
	int data[SIZE];
	int tos;
public:
	Stack() { tos = -1; }
	bool isEmpty() { return tos == -1; }
	bool isFull() { return tos == SIZE - 1; }

	void push(int elem);
	int pop();
};

void Stack::push(int elem)
{
	if (isFull())
		throw StackOverflowError("push", __FILE__, __LINE__);
	tos++;
	data[tos] = elem;
}

int Stack::pop()
{
	if (isEmpty())
		//throw StackUnderflowError("pop", __FILE__, __LINE__);
		throw StackUnderflowError(__FUNCTION__, __FILE__, __LINE__);
	int rlt = data[tos];
	tos--;
	return rlt;
	   
}