接着上一篇（二）

#include <iostream>
using namespace std;
class Complex
{
public:
    Complex()
    {
        real=0;
        imag=0;
    }
    Complex(double r,double i)
    {
        real=r;
        imag=i;
    }
    double getReal() const
    {
        return real;   //(1)定义公用的数据接口，可以为const成员函数
    }
    double getImag() const
    {
        return imag;
    }
    void setReal(double r)
    {
        real=r;   //(1)定义公用的数据接口
    }
    void setImag(double i)
    {
        imag=i;
    }


    void display();
private:
    double real;
    double imag;
};

//复数相加：(a+bi)+(c+di)=(a+c)+(b+d)i.
Complex operator+(const Complex &c1, const Complex &c2) //(3)将参数处理为const更符合需求
{
    Complex c;
    c.setReal(c1.getReal()+c2.getReal());   //(2)调用公用数据接口读取和修改私有数据成员
    c.setImag(c1.getImag()+c2.getImag());
    return c;
}

//复数相减：(a+bi)-(c+di)=(a-c)+(b-d)i.
Complex operator-(const Complex &c1, const Complex &c2)
{
    Complex c;
    c.setReal(c1.getReal()-c2.getReal());
    c.setImag(c1.getImag()-c2.getImag());
    return c;
}

//复数相乘：(a+bi)(c+di)=(ac－bd)+(bc+ad)i.
Complex operator*(const Complex &c1, const Complex &c2)
{
    Complex c;
    c.setReal(c1.getReal()*c2.getReal()-c1.getImag()*c2.getImag());
    c.setImag(c1.getImag()*c2.getReal()+c1.getReal()*c2.getImag());
    return c;
}

//复数相除：(a+bi)/(c+di)=(ac+bd)/(c^2+d^2) +(bc-ad)/(c^2+d^2)i
Complex operator/(const Complex &c1, const Complex &c2)
{
    Complex c;
    double d= (c2.getReal()*c2.getReal()+c2.getImag()*c2.getImag());
    c.setReal((c1.getReal()*c2.getReal()+c1.getImag()*c2.getImag())/d);
    c.setImag((c1.getImag()*c2.getReal()-c1.getReal()*c2.getImag())/d);
    return c;
}

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：

体会心得：