第八周 课后实践：项目一——实现复数类中的运算符重载（3）

问题及代码：

#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 d1, Complex &c2);    friend Complex operator+(Complex &c1, double d2);    friend Complex operator-(Complex &c1,Complex &c2);    friend Complex operator-(double d1, Complex &c2);    friend Complex operator-(Complex &c1, double d2);    friend Complex operator*(Complex &c1,Complex &c2);    friend Complex operator*(double d1, Complex &c2);    friend Complex operator*(Complex &c1, double d2);    friend Complex operator/(Complex &c1,Complex &c2);    friend Complex operator/(double d1, Complex &c2);    friend Complex operator/(Complex &c1, double d2);    void display();private:    double real;    double imag;};//下面定义成员函数Complex operator+(Complex &c1,Complex &c2){    return Complex(c1.real+c2.real,c1.imag+c2.imag);}Complex operator+(double d1,Complex &c2){    Complex c(d1,0);    return c+c2;}Complex operator+(Complex &c1,double d2){    Complex c(d2,0);    return c1+c;}Complex operator-(Complex &c1,Complex &c2){    return Complex(c1.real-c2.real,c1.imag-c2.imag);}Complex operator-(double d1,Complex &c2){    Complex c(d1,0);    return c-c2;}Complex operator-(Complex &c1,double d2){    Complex c(d2,0);    return c1-c;}Complex operator*(Complex &c1,Complex &c2){    Complex c;    c.real=c1.real*c2.real-c1.imag*c2.imag;    c.imag=c1.imag*c2.real+c1.real*c2.imag;    return c;}Complex operator*(double d1,Complex &c2){    Complex c(d1,0);    return c*c2;}Complex operator*(Complex &c1,double d2){    Complex c(d2,0);    return c1*c;}Complex operator/(Complex &c1,Complex &c2){    Complex c;    c.real=(c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    c.imag=(c1.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    return c;}Complex operator/(double d1,Complex &c2){    Complex c(d1,0);    return c/c2;}Complex operator/(Complex &c1,double d2){    Complex c(d2,0);    return c1/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(3,4),c2(5,-10),c3;    double d=6;    cout<<"c1=";    c1.display();    cout<<"c2=";    c2.display();    cout<<"d="<<d<<endl;    c3=c1+c2;    cout<<"c1+c2=";    c3.display();    cout<<"c1+d";    (c1+d).display();    cout<<"d+c1=";    (d+c1).display();    c3=c1-c2;    cout<<"c1-c2=";    c3.display();    cout<<"c1-d=";    (c1-d).display();    cout<<"d-c1=";    (d-c1).display();    c3=c1*c2;    cout<<"c1*c2=";    c3.display();    cout<<"c1*d=";    (c1*d).display();    cout<<"d*c1=";    (d*c1).display();    c3=c1/c2;    cout<<"c1/c2=";    c3.display();    cout<<"c1/d=";    (c1/d).display();    cout<<"d/c1=";    (d/c1).display();    return 0;}

 

运行结果：