第十二周实践项目1.2-实现复数类中的运算符重载

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问题及代码：

/* *Copyright(c)2016,烟台大学计算机与控制工程学院 *All right reserved. *文件名称：77.cpp *作    者：董凯琦 *完成日期：2016年5月18日 *版 本 号：v1.0 * *问题描述：请用类的友元函数，定义复数类重载运算符+、-、*、/，使之能用于复数的加减乘除 *输入描述： *程序输出： */ #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+(Complex &c1, Complex &c2);    friend Complex operator-(Complex &c1, Complex &c2);    friend Complex operator*(Complex &c1, Complex &c2);    friend Complex operator/(Complex &c1, Complex &c2);    void display();private:    double real;    double imag;};Complex operator+(Complex &c1, Complex &c2){    return Complex(c1.real+c2.real,c1.imag+c2.imag);}Complex operator-(Complex &c1, Complex &c2){    return Complex(c1.real-c2.real,c1.imag-c2.imag);}Complex operator*(Complex &c1, Complex &c2){    return Complex(c1.real*c2.real,c1.imag*c2.imag);}Complex operator/(Complex &c1, Complex &c2){    return Complex(c1.real/c2.real,c1.imag/c2.imag);}void Complex::display(){    cout<<"("<<real<<","<<imag<<"i)"<<endl;}int main(){    Complex c1(3,4),c2(5,-10),c3;    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();    return 0;}

运行结果：

知识点总结：

要注意成员函数完成运算符重载，和友元函数完成时的区别：

1.在定义构造函数时，成员函数包含一个参数而友元函数包含两个参数。

例如

 <span style="font-family: Arial, Helvetica, sans-serif;">friend Complex operator+(Complex &c1, Complex &c2);</span>

<span style="font-family: Arial, Helvetica, sans-serif;">2.在实现的时候友元函数：</span>

<span style="font-family: Arial, Helvetica, sans-serif;"></span><pre name="code" class="cpp">Complex operator+(Complex &c1, Complex &c2){    return Complex(c1.real+c2.real,c1.imag+c2.imag);}

而成员函数：

<span style="font-family: Arial, Helvetica, sans-serif;">Complex Complex::operator+(const Complex &c2){    return Complex(real+c2.real,imag+c2.imag);}</span>

<span style="font-family: Arial, Helvetica, sans-serif;">学习心得：</span>

<span style="font-family: Arial, Helvetica, sans-serif;">要善于总结规律！</span>

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