複數重載和模板的應用

/*
* Copyright (c) 2013, 煙臺大學計算機學院
* All rights reserved.
* 作    者：紀麗娜
* 完成日期：2014 年 4 月21 日
* 版 本 號：v1.0
* 問題描述：重載和模板的應用
*/
#include <iostream>
using namespace std;
template < class T >
class Complex
{
public:
    Complex()
    {
        real=0;
        imag=0;
    }
    Complex(T r,T i)
    {
        real=r;
        imag=i;
    }
    Complex operator+(Complex &c2);
    Complex operator-(Complex &c2);
    Complex operator*(Complex &c2);
    Complex operator/(Complex &c2);
    void display();
private:
    double real;
    double imag;
};
//下面定義成員函數
template <class T>
Complex<T> Complex<T>::operator+(Complex < T > &c2)
{
    Complex<T> c;
    c.real=real+c2.real;
    c.imag=imag+c2.imag;
    return c;
}
template <class T>
Complex<T> Complex<T>::operator-(Complex < T > &c2)
{
    Complex<T> c;
    c.real=real-c2.real;
    c.imag=imag-c2.imag;
    return c;
}
template <class T>
Complex<T> Complex<T>::operator*(Complex < T > &c2)
{
    Complex<T> c;
    c.real=(real*c2.real-imag*c2.imag);
    c.imag=(real*c2.imag+imag*c2.real);
    return c;
}
template <class T>
Complex<T> Complex<T>::operator/(Complex < T > &c2)
{
    Complex<T> c;
    c.real=(real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
    c.imag=(imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
    return c;
}
template <class T>
void Complex<T>::display()
{
     if(real==0)
     {cout<<imag<<"i"<<endl;
     }else
    {
        if(imag<0)
     {cout<<real<<imag<<"i"<<endl;
     }else if(imag==0)
     {cout<<real<<endl;
     }else
     {cout<<real<<"+"<<imag<<"i"<<endl;}
    }
}
//下面定義用於測試的main()函數
int main()
{
    Complex<int> c1(3,4),c2(5,-10),c3;
    cout<<"int 類型:"<<endl;
    cout<<"c1=";
    c1.display();
    cout<<"c2=";
    c2.display();
    c3=c1+c2;
    cout<<"c1+c2=";
    c3.display();
    c3=c1-c2;
    cout<<"c1-c2=";
    c3.display();
    c3=c1*c2;
    cout<<"c1*c2=";
    c3.display();
    c3=c1/c2;
    cout<<"c1/c2=";
    c3.display();
    cout<<"double 類型："<<endl;
    Complex<double> c4(3.1,4.4),c5(5.34,-10.21),c6; //定義對象時，用“類模板名<實際類型名>”形式
    cout<<"c4=";
    c4.display( );

    cout<<"c5=";
    c5.display( );

    c6=c4+c5;
    cout<<"c4+c5=";
    c6.display( );

    c6=c4-c5;
    cout<<"c4-c5=";
    c6.display( );

    c6=c4*c5;
    cout<<"c4*c5=";
    c6.display( );


    c6=c4/c5;
    cout<<"c4/c5=";
    c6.display( );

    return 0;
}