C++语言 通过类模板实现加法计算器

//C++语言 通过类模板实现加法计算器

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

template <class T>
class Calculate //声明一个模板类
{
    public:
        Calculate(T a, T b);
    public:
        T Add();
        T Substraction();
        void display();
    private:
        T m_a;
        T m_b;
};

template <class T>
Calculate<T>::Calculate(T a, T b)
{
    m_a = a;
    m_b  = b;
}
template <class T>
T Calculate<T>::Add()
{
    return m_a + m_b;
}
template <class T>
T Calculate<T>::Substraction()
{
    return m_a - m_b;
}
template <class T>
void Calculate<T>::display()
{
    cout << "a:" << m_a << endl;
    cout << "b:" << m_b << endl;
}

int main(int argc, char* argv[])
{
    Calculate<int> cal1(20, 10);
    cal1.display();
    cout << "Add():" << cal1.Add() << endl;
    cout << "Substraction():" << cal1.Substraction() << endl;
    
    Calculate<double> cal2(100.23, 40);
    cal2.display();
    cout << "Add():" << cal2.Add() << endl;
    cout << "Substraction():" << cal2.Substraction() << endl;

    return 0;
}