第九周项目一复数类中的运算符重载（续）

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/*Copyright(c)2014,烟台大学计算机学院   *Allrights reserved.   *文件名称:MADE2.cpp   *作    者:张生栋   *完成日期:2015年5月13日   *问题描述:定义一个定义完整的类（是可以当作独立的产品发布，成为众多项目中的“基础工程”）。  这样的类在(2)的基础上，扩展+、-、*、/运算符的功能，使之能与double型数据进行运算。设Complex c;   double d; c+d和d+c的结果为“将d视为实部为d的复数同c相加”，其他-、*、/运算符类似 ，再定义一目运算符-，-c相当于0-c，再定义<<和>>的重载 *输入描述:两个复数 *输出描述：略   *版 本 号：v1.0   */    #include <iostream>using namespace std;class Complex{public:    Complex(){real=0;imag=0;}    Complex(double r,double i){real=r; imag=i;}    Complex operator-();    friend ostream& operator << (ostream& output, const Complex& c);    friend istream& operator >> (istream& input, Complex& c);    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,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);private:    double real;    double imag;};//下面定义成员函数ostream& operator << (ostream& output, const Complex& c){    output<<"("<<c.real;    if(c.imag>0)        output<<"+";    output<< c.imag<<"i)";    return output;}istream& operator >> (istream& input, Complex& c){    int a,b;    char sign,i;    cout<<"请输入一个复数:";    input>>a>>sign>>b>>i;    while(!((sign=='+'||sign=='-')&&i=='i'));    c.real=a;    c.imag=(sign=='+')?b:-b;    return input;}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 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;    c.imag=c1.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;}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(0,d2);    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(0,d2);    return c1/c;}//下面定义用于测试的main()函数int main(){    Complex c1,c2,c3;    double d=11;    cout<<"c1: "<<endl;;    cin>>c1;    cout<<"c2: "<<endl;    cin>>c2;    cout<<"c1="<<c1<<endl;    cout<<"c2="<<c2<<endl;    cout<<"d="<<d<<endl;    //cout<<"-c1="<<(-c1);    c3=c1+c2;    cout<<"c1+c2="<<c3<<endl;    cout<<"c1+d="<<(c1+d)<<endl;    cout<<"d+c1="<<(d+c1)<<endl;    c3=c1-c2;    cout<<"c1-c2="<<c3<<endl;    cout<<"c1-d="<<(c1-d)<<endl;    cout<<"d-c1="<<(d-c1)<<endl;    c3=c1*c2;    cout<<"c1*c2="<<c3<<endl;    cout<<"c1*d="<<(c1*d)<<endl;    cout<<"d*c1="<<(d*c1)<<endl;    c3=c1/c2;    cout<<"c1/c2="<<c3<<endl;    cout<<"c1/d="<<(c1/d)<<endl;    cout<<"d/c1="<<(d/c1)<<endl;    return 0;}
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