第九周 项目一-复数类中的运算符重载（续）

在复数类中的运算符重载基础上
（1）再定义一目运算符 -，-c相当于0-c。
（2）定义Complex类中的<<和>>运算符的重载，实现输入和输出，改造原程序中对运算结果显示方式，使程序读起来更自然。

/*   * Copyright (c) 2015, 烟台大学计算机学院   * All rights reserved.   * 文件名称：test.cpp   * 作    者：冷基栋   * 完成日期：2015年 5 月 8 日   * 版 本 号：v1.0  */  #include <iostream>using namespace std;class Complex{public:    Complex()    {        real=0;        imag=0;    }    Complex operator -();    friend ostream& operator<<(ostream& out, Complex& c) ;    friend istream& operator>>(istream& in, Complex& c)  ;    Complex(double r,double i)    {        real=r;        imag=i;    }    Complex operator+(const Complex &c2);    Complex operator-(const Complex &c2);    Complex operator*(const Complex &c2);    Complex operator/(const Complex &c2);    friend Complex operator-(double d1, Complex &c2);    void display();private:    double real;    double imag;};//下面定义成员函数Complex Complex::operator -(){    return (0-*this);}ostream& operator<<(ostream& out, Complex &c){    out<<"("<<c.real;    if (c.imag>=0)out<<"+";    out<<c.imag<<")"<<endl;    return out;}istream& operator>>(istream& in, Complex &c){    char a,i;    int m,n;    do    {        cout<<"input a complex number:"<<endl;        in>>m>>a>>n>>i;    }    while(!((a=='+'||a=='-')&&i=='i'));    c.real=m;    c.imag=(a=='+')?n:-n;    return in;}Complex operator-(double d1, Complex &c2){    Complex c(d1,0);    return c-c2;}//复数相加： (a+bi)+(c+di)=(a+c)+(b+d)i.Complex Complex::operator+(const Complex &c2){    Complex c;    c.real=real+c2.real;    c.imag=imag+c2.imag;    return c;}//复数相减：(a+bi)-(c+di)=(a-c)+(b-d)i.Complex Complex::operator-(const Complex &c2){    Complex c;    c.real=real-c2.real;    c.imag=imag-c2.imag;    return c;}//复数相乘：(a+bi)(c+di)=(ac－bd)+(bc+ad)i.Complex Complex::operator*(const Complex &c2){    Complex c;    c.real=real*c2.real-imag*c2.imag;    c.imag=imag*c2.real+real*c2.imag;    return c;}//复数相除：(a+bi)/(c+di)=(ac+bd)/(c^2+d^2) +(bc-ad)/(c^2+d^2)iComplex Complex::operator/(const Complex &c2){    Complex 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;}void Complex::display(){    cout<<"("<<real<<","<<imag<<"i)"<<endl;}//下面定义用于测试的main()函数int main(){    Complex c1,c2,c3,c4;    cout<<"c1: "<<endl;;    cin>>c1;    cout<<"c2: "<<endl;    cin>>c2;    cout<<"c1="<<c1<<endl;    cout<<"c2="<<c2<<endl;    cout<<"-c1=";    c4=-c1;    cout<<c4;    c3=c1+c2;    cout<<"c1+c2="<<c3<<endl;    c3=c1-c2;    cout<<"c1-c2="<<c3<<endl;    c3=c1*c2;    cout<<"c1*c2="<<c3<<endl;    c3=c1/c2;    cout<<"c1/c2="<<c3<<endl;    return 0;}

运行结果：

知识点总结：

多个重载运算符最好不要放在一起

学习心得：

好好学习 天天向上