第九周 项目1-复数类中的运算符重载（续）

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)i
Complex 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