复数运算符重载

/*。
*Copyright(c)2014,烟台大学计算机学院
*All right reserved,
*文件名：test.cpp
*作者：liu_feng_zi_
*完成日期：2015年6月25日
*版本号：v1.0
*问题描述：复数运算符重载（+与<<）
*输入描述：
*程序输出：
*/
#include <iostream>
#include <iomanip>
using namespace std;
class Complex
{
public:
Complex():real(0),imag(0) {}
Complex(double r,double i):real(r),imag(i) {}
Complex operator+(Complex &);
Complex operator+(double &);
friend Complex operator+(double&,Complex &);
friend ostream& operator << (ostream& output, const Complex& c);
private:
double real;
double imag;
};
Complex Complex::operator+(Complex &c)
{
Complex cc;
cc.real=real+c.real;
cc.imag=imag+c.imag;
return cc;
}
Complex Complex::operator+(double &c)
{
Complex cc;
cc.real=real+c;
cc.imag=imag;
return cc;
}
Complex operator+(double&d,Complex &c)
{
Complex cc;
cc.real=c.real+d;
cc.imag=c.imag;
return cc;
}
ostream& operator << (ostream& output, const Complex& c)
{
output<<setiosflags(ios::fixed)<<setprecision(2);
output<<"("<<c.real<<((c.imag>0)?"+":"")<<c.imag<<"i)"<<endl;
return output;
}
int main()
{
//测试复数加复数
double real,imag;
cin>>real>>imag;
Complex c1(real,imag);
cin>>real>>imag;
Complex c2(real,imag);
Complex c3=c1+c2;
cout<<"c1+c2=";
cout<<c3;

//测试复数加实数
double d;
cin>>real>>imag;
cin>>d;
c3=Complex(real,imag)+d;
cout<<"c1+d=";
cout<<c3;

//测试实数加复数
cin>>d;
cin>>real>>imag;
c1=Complex(real,imag);
c3=d+c1;
cout<<"d+c1=";
cout<<c3;

return 0;
}