第8周项目1（3）—扩充运算符功能

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#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+(const Complex &c1,const Complex &c2);    friend Complex operator+(const Complex &c1,double a);    friend Complex operator-(const Complex &c1,const Complex &c2);    friend Complex operator-(const Complex &c1,double a);    friend Complex operator*(const Complex &c1,const Complex &c2);    friend Complex operator*(const Complex &c1,double a);    friend Complex operator/(const Complex &c1,const Complex &c2);    friend Complex operator/(const Complex &c1,double a);    void display();private:    double real;    double imag;};//下面定义成员函数Complex operator+(const Complex &c1,double a){    return Complex(c1.real+a,c1.imag);}Complex operator-(const Complex &c1,double a){    return Complex(c1.real-a,c1.imag);}Complex operator*(const Complex &c1,double a){    return Complex(c1.real*a,c1.imag*a);}Complex operator/(const Complex &c1,double a){    return Complex(c1.real/a,c1.imag/a);}Complex operator+(const Complex &c1,const Complex &c2){    return Complex(c1.real+c2.real,c1.imag+c2.imag);}Complex operator-(const Complex &c1,const Complex &c2){    return Complex(c1.real-c2.real,c1.imag-c2.imag);}Complex operator*(const Complex &c1,const Complex &c2){    return Complex(c1.real*c2.real-c1.imag*c2.imag,c1.real*c2.imag+c2.real*c1.imag);}Complex operator/(const Complex &c1,const Complex &c2){    return Complex((c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag),(-c1.real*c2.imag+c2.real*c1.imag)/(c2.real*c2.real+c2.imag*c2.imag));}void Complex::display(){    if(imag>0)    cout<<real<<"+"<<imag<<"i"<<endl;    else        cout<<real<<imag<<"i"<<endl;}//下面定义用于测试的main()函数int main(){    Complex c1(3,4),c2(5,-10),c3;    double a=3;    cout<<"c1=";    c1.display();    cout<<"c2=";    c2.display();    c3=c1+a;    cout<<"c1+a=";    c3.display();    c3=c1-a;    cout<<"c1-a=";    c3.display();    c3=c1*a;    cout<<"c1*a=";    c3.display();    c3=c1/a;    cout<<"c1/a=";    c3.display();    return 0;}
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