C++复数运算符重载（+与<<）

#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;
};

//将程序需要的其他成份写在下面，只提交begin到end部分的代码
//******************** begin ********************

Complex Complex::operator+(Complex &p)
{
return Complex(real+p.real,imag+p.imag);

}
Complex Complex::operator+(double &p)
{
return Complex(real+p,imag);

}
Complex operator+(double&p,Complex &p1)
{
return Complex(p+p1.real,p1.imag);

}
ostream& operator<<(ostream& output, const Complex& c)
{
if(c.imag>0)

output<<setiosflags(ios::fixed)<<setprecision(2)<<"("<<c.real<<"+"<<c.imag<<"i)"<<endl;
else
output<<setiosflags(ios::fixed)<<setprecision(2)<<"("<<c.real<<c.imag<<"i)"<<endl;
return output;
}

//********************* end ********************
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;
}