第9周项目1-复数类中的运算符重载（续）-优快云博客

本文链接：https://blog.youkuaiyun.com/sinat_21382429/article/details/45795943

本文介绍了一个使用C++实现的复数类，该类支持基本的复数运算并通过运算符重载来简化表达式。文中详细展示了如何通过重载加、减、乘、除等运算符来实现复数之间的各种运算。

#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+(double d,Complex &c2);
    friend Complex operator-(Complex &c1,Complex &c2);
    friend Complex operator-(double d,Complex &c2);
    friend Complex operator*(Complex &c1,Complex &c2);
    friend Complex operator*(double d,Complex &c2);
    friend Complex operator/(Complex &c1,Complex &c2);
    friend Complex operator/(double d,Complex &c2);
    Complex operator-();
    friend istream& operator>>(istream &in,Complex &c);
    friend ostream& operator<<(ostream &out,Complex &c);
    void display();
private:
    double real;
    double imag;
};

Complex Complex::operator-()
{
    return (0-*this);
}

istream& operator>>(istream &in,Complex &c)
{
    int r,i;
    char a,b;
    do
    {
        cout<<"input a complex number(a+bi或a-bi):"<<endl;
        in>>r>>a>>i>>b;
    }while(!((a=='+'||a=='-')&&b=='i'));
    c.real=r;
    c.imag=(a=='+')?i:-i;
    return in;
}

ostream& operator<<(ostream &out,Complex &c)
{
    out<<"("<<c.real;
    if(c.imag>0)
        out<<"+";
    out<<c.imag<<"i)";
    return out;
}

Complex operator+(Complex &c1,Complex &c2)
{
    Complex c;
    c.real=c1.real+c2.real;
    c.imag=c1.imag+c2.imag;
    return c;
}

Complex operator+(double d,Complex &c2)
{
    return Complex(c2.real+d,c2.imag);
}

Complex operator-(Complex &c1,Complex &c2)
{
    Complex c;
    c.real=c1.real-c2.real;
    c.imag=c1.imag-c2.imag;
    return c;
}

Complex operator-(double d,Complex &c2)
{
    return Complex(c2.real-d,c2.imag);
}

Complex operator*(Complex &c1,Complex &c2)
{
    Complex c;
    c.real=c1.real*c2.real;
    c.imag=c1.imag*c2.imag;
    return c;
}

Complex operator*(double d,Complex &c2)
{
    return Complex(c2.real*d,c2.imag);
}

Complex operator/(Complex &c1,Complex &c2)
{
    Complex c;
    c.real=c1.real/c2.real;
    c.imag=c1.imag/c2.imag;
    return c;
}

Complex operator/(double d,Complex &c2)
{
    return Complex(c2.real/d,c2.imag);
}

void Complex::display()
{
    cout<<'('<<real<<','<<imag<<')'<<endl;
}

int main()
{
    Complex c1,c2,c3;
    double d=5;
    cout<<"c1=";
    cin>>c1;
    cout<<"c2=";
    cin>>c2;
    cout<<"c1="<<c1<<endl;
    cout<<"c2="<<c2<<endl;
    cout<<"d="<<d<<endl;
    c3=c1+c2;
    cout<<"c1+c2="<<c3<<endl;
    c3=5+c1;
    cout<<"c1+5="<<c3<<endl;
    c3=c1-c2;
    cout<<"c1-c2="<<c3<<endl;
    c3=5-c1;
    cout<<"5-c1="<<c3<<endl;
    c3=c1*c2;
    cout<<"c1*c2="<<endl;
    c3=5*c1;
    cout<<"c1*5="<<c3<<endl;
    c3=c1/c2;
    cout<<"c1/c2="<<c3<<endl;
    c3=5/c1;
    cout<<"5/c1="<<c3<<endl;
    return 0;
}

运行结果：