第八週實驗報告（任務1-方案3）

程序頭部註釋開始
* 程序的版權和版本聲明部分
* Copyright (c) 2011, 煙臺大學計算機學院學生
* All rights reserved.
* 文件名稱：     用友元函數完成運算符重載          
* 作    者：     郭廣建                       
* 完成日期：  2012年    04  月  10     日
* 版 本 號：  1.0

題目介紹：

方案三：在方案二的基礎上，擴展+、-、*、/運算符的功能，使之能與double型數據進行運算。設Complex c; double d; c?d和d?c的結果爲將d視爲實部爲d的複數同c運算的結果（其中?爲+、-、*、/之一）。

源程序：

#include<iostream>

using namespace std;

class Complex
{
public:
    Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r;imag=i;}
    friend Complex operator+(double d,Complex &c2);
    friend Complex operator-(double d,Complex &c2);
    friend Complex operator*(double d,Complex &c2);
    friend Complex operator/(double d,Complex &c2);
    friend Complex operator+(Complex &c2,double d);
    friend Complex operator-(Complex &c2,double d);
    friend Complex operator*(Complex &c2,double d);
    friend Complex operator/(Complex &c2,double d);
    void display();
private:
    double real;
    double imag;
};
//下面定義成員函數
Complex operator+(double d, Complex &c2)
{
	return Complex(d + c2.real , c2.imag);
}
Complex operator-(double d, Complex &c2)
{
	return Complex(d - c2.real , c2.imag);
}
Complex operator*(double d, Complex &c2)
{
	return Complex( d * c2.real ,d * c2.imag);
}
Complex operator/(double d, Complex &c2)
{
	return Complex(d / c2.real ,d / c2.imag);
}
Complex operator+(Complex &c2,double d)
{
	return Complex(c2.real+d, c2.imag);
}
Complex operator-(Complex &c2,double d)
{
	return Complex(c2.real-d, c2.imag);
}
Complex operator*(Complex &c2,double d)
{
	return Complex(c2.real*d ,c2.imag*d);
}
Complex operator/(Complex &c2,double d)
{
    return Complex(c2.real/d , c2.imag/d);
}
void Complex::display()
{
	cout << '(' << real << ',' << imag << ')' <<endl;
} 
int main()
{
    double d = 3.14;
    Complex c1(3,4),c2(5,-10),c3;
    cout<<"c1=";
    c1.display();
    cout<<"c2=";
    c2.display();
    c3=d+c1;
    cout<<"d+c1";
    c3.display();
    c3=d-c1;
    cout<<"d-c1";
    c3.display();
    c3=d*c1;
    cout<<"d*c1";
    c3.display();
    c3=d/c1;
    cout<<"d/c2=";
    c3.display();
	c3=c2+d;
    cout<<"c2+d=";
    c3.display();
    c3=c2-d;
    cout<<"c2-d=";
    c3.display();
    c3=c2*d;
    cout<<"c2*d=";
    c3.display();
    c3=c2/d;
    cout<<"c2/d=";
    c3.display();  
    system("pause");
    return 0;
}

運行結果：