第九周项目一 复数问题 增加一目- 与重载<<和>>

问题及代码

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*文件名称: 初学对象6                  
作者：李长鸿                   
*完成时间：2015.513             
*问题描述： 复数问题               
*/

<pre class="cpp" name="code">#include<iostream>using namespace std;class Complex{public:    Complex()    {        real=0;        imag=0;    }    Complex(double r,double i)    {        real=r;        imag=i;    }    Complex operator-(int)    {        return Complex(0-real,0-imag);    }    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);    friend Complex operator+(const Complex &c1,const double d);    friend Complex operator-(const Complex &c1,const double d);    friend Complex operator*(const Complex &c1,const double d);    friend Complex operator/(const Complex &c1,const double d);    friend istream &operator>>(istream &in,const Complex &c1);    friend ostream &operator<<(ostream &out,const Complex &c1);private:    double real;    double imag;};//下面定义成员函数Complex operator+(const Complex &c1,const Complex c2){    return Complex(c1.real+c2.real,c1.imag+c2.imag);}Complex operator-(const Complex &c1,const Complex c2){    return Complex(c1.real-c2.real,c1.imag-c2.imag);}Complex operator*(const Complex &c1,const Complex c2){    return Complex(c1.real*c2.real,c1.imag*c2.imag);}Complex operator/(const Complex &c1,const Complex c2){    return Complex(c1.real/c2.real,c1.imag/c2.imag);}Complex operator+(const Complex &c1,const double d){    return Complex(c1.real+d,c1.imag);}Complex operator-(const Complex &c1,const double d){    return Complex(c1.real-d,c1.imag);}Complex operator*(const Complex &c1,const double d){    return Complex(c1.real*d,c1.imag);}Complex operator/(const Complex &c1,const double d){    return Complex(c1.real/d,c1.imag);}ostream& operator<<(ostream &out,const Complex &c1){    out<<"("<<c1.real;    if(c1.imag>=0)out<<"+";    out<<c1.imag<<"i)"<<endl;    return out;}//下面定义用于测试的main()函数int main(){    Complex c1(3,4),c2(5,-10),c3;    cout<<"-c1="<<c1-4<<"-c2="<<c2-1;    cout<<"c1="<<c1;    cout<<"c2="<<c2;    cout<<"c1+c2="<<c1+c2;    cout<<"c1-c2="<<c1-c2;    cout<<"c1*c2="<<c1*c2;    cout<<"c1/c2="<<c1/c2;    cout<<endl;    double d=7.77;    Complex c(7,7);    cout<<"c="<<c1;    cout<<"d="<<d<<endl;    cout<<"c+d="<<c+d;    cout<<"c-d="<<c-d;    cout<<"c*d="<<c*d;    cout<<"c/d="<<c/d;    return 0;}

 

总结：声明时不是少写&就是少写<<或>>，磕磕绊绊总是不会再少写了