复数的运算符重载----友元函数

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代码：
#include <iostream>using namespace std;class Complex{public:    Complex(double r,double i)    {        real=r;        imag=i;    }    Complex()    {        real=0;        imag=0;    }    friend Complex operator+(const Complex &c1,const Complex &c2);    friend Complex operator-(const Complex &c1,const Complex &c2);    friend Complex operator*(const Complex &c1,const Complex &c2);    friend Complex operator/(const Complex &c1,const Complex &c2);    void display();private:    double real;    double imag;};Complex operator+(const Complex &c1,const Complex &c2){    Complex c;    c.real=c1.real+c2.real;    c.imag=c1.imag+c2.imag;    return c;}Complex operator-(const Complex &c1,const Complex &c2){    Complex c;    c.real=c1.real-c2.real;    c.imag=c1.imag-c2.imag;    return c;}Complex operator*(const Complex &c1,const Complex &c2){    Complex c;    c.real=c1.real*c2.real;    c.imag=c1.imag*c2.imag;    return c;}Complex operator/(const Complex &c1,const Complex &c2){    Complex c;    c.real=c1.real/c2.real;    c.imag=c1.imag/c2.imag;    return c;}void Complex::display(){    cout<<real;    if(imag==1)        cout<<"+i"<<endl;    else if(imag>0)        cout<<"+"<<imag<<"i"<<endl;    else if(imag<0)        cout<<imag<<"i"<<endl;    else if(imag==0)        cout<<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;}
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