第八周项目一 实现复数类中的运算符重载

 

（1）请用类的成员函数，定义复数类重载运算符+、-、*、/，使之能用于复数的加减乘除。

 

#include <iostream>using namespace std;class Complex{public:    Complex(){real=0;imag=0;}    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);    void display();private:    double real;    double imag;};//下面定义成员函数Complex Complex::operator+(const Complex &c2){    Complex a;    a.real=real+c2.real;    a.imag=imag+c2.imag;    return a;}Complex Complex::operator-(const Complex &c2){    Complex a;    a.real=real-c2.real;    a.imag=imag-c2.imag;    return a;}Complex Complex::operator*(const Complex &c2){    Complex a;    a.real=real*c2.real;    a.imag=imag*c2.imag;    return a;}Complex Complex::operator/(const Complex &c2){    Complex a;    a.real=real/c2.real;    a.imag=imag/c2.imag;    return a;}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;    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：

 

（2）请用类的友元函数，而不是成员函数，再次完成上面提及的运算符的重载。

 

#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-(Complex &c1,Complex &c2);    friend Complex operator*(Complex &c1,Complex &c2);    friend Complex operator/(Complex &c1,Complex &c2);    void display();private:    double real;    double imag;};//下面定义成员函数Complex operator+(Complex &c1,Complex &c2){    Complex a;    a.real=c1.real+c2.real;    a.imag=c1.imag+c2.imag;    return a;}Complex operator-(Complex &c1,Complex &c2){    Complex a;    a.real=c1.real-c2.real;    a.imag=c1.imag-c2.imag;    return a;}Complex operator*(Complex &c1,Complex &c2){    Complex a;    a.real=c1.real*c2.real;    a.imag=c1.imag*c2.imag;    return a;}Complex operator/(Complex &c1,Complex &c2){    Complex a;    a.real=c1.real/c2.real;    a.imag=c1.imag/c2.imag;    return a;}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;    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：