stake made by template

// ConsoleApplication2.cpp : 定義主控台應用程式的進入點。
//

#include "stdafx.h"
#include <iostream>
using namespace std;

template < class T, int maxsize = 20>
class stake
{
public:
    stake(){ sp = 0; }
    void push(T data);
    T pop();
private:
    int sp;
    T buffer[maxsize];
    static void error(){ cout << "\nstake error\n"; }
};

template<class T,int maxsize>
void stake<T, maxsize>::push(T data)
{
    if (sp == maxsize)
        error();
    else
    {
        buffer[sp++] = data;
    }
}

template<class T,int maxsize>
T stake<T, maxsize>::pop()
{
    if (sp == 0)
    {
        error();
        return 0;
    }
    else
    {
        cout << buffer[--sp];
    }
}


int main()
{
    stake<int> st1;
    stake<char, 10> st2;

    st1.push(1);
    st1.push(2);
    st1.push(3);

    st2.push('a');
    st2.push('b');
    st2.push('c');

    st1.pop();
    st2.pop();
    st1.pop();
    st2.pop();
    st1.pop();
    st2.pop();
    st2.pop();
    return 0;
}