第九周上机实践项目——更自然实现复数类中的运算符重载

/**程序的版权和版本声明部分：*Copyright（c）2013，烟台大学计算机学院学生*All rights reserved.*文件名称：更自然实现复数类中的运算符重载*作者：刘中林*完成日期：2014年4月22日*版本号：v0.1*对任务及求解方法的描述部分：*输入描述：初始化的实数和虚数*问题描述:加减乘除及运算符"<<"和">>"的重载 *程序输入：规定的初始化实数和虚数*程序输出：计算后的结果*问题分析：无*算法设计：虚数的加减乘除*我的程序：*/#include <iostream>using namespace std;class Complex{public:    friend ostream&operator<<(ostream&,Complex&);//声明友元重载运算符"<<"函数    friend istream&operator>>(istream&,Complex&);//声明友元重载运算符">>"函数    Complex(){real=0;imag=0;}    Complex(double r,double i){real=r; imag=i;}    Complex operator+(Complex &c2);    Complex operator-(Complex &c2);    Complex operator*(Complex &c2);    Complex operator/(Complex &c2);private:    double real;    double imag;};ostream&operator<<(ostream& output,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;    do    {        cout<<"input a complex number(a+bi或a-bi)";        input>>a>>sign>>b>>i;    }    while(!((sign=='+'||sign=='-')&&i=='i'));    {        c.real=a;        c.imag=(sign=='+')?b:-b;    }    return input;}Complex Complex::operator+(Complex &c2){Complex c;c.real=real+c2.real;c.imag=imag+c2.imag;return c;}Complex Complex::operator-(Complex &c2){Complex c;c.real=real-c2.real;c.imag=imag-c2.imag;return c;}Complex Complex::operator*(Complex &c2){    Complex c;    c.real=real*c2.real-imag*c2.imag;    c.imag=real*c2.imag+imag*c2.real;    return c;}Complex Complex::operator/(Complex &c2){    Complex c;    c.real=(real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    c.imag=(imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);    return c;}//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<<endl;    cout<<"c2="<<c2<<endl;    c3=c1+c2;    cout<<"c1+c2="<<c3<<endl;    c3=c1-c2;    cout<<"c1-c2="<<c3<<endl;    c3=c1*c2;    cout<<"c1*c2="<<c3<<endl;    c3=c1/c2;    cout<<"c1/c2="<<c3<<endl;    return 0;}

*样例输出：

*心得体会：只能将重载">>"和"<<"的函数作为友原函数，而不能将他们定义为成员函数。。