c++習題1_C_複數運算符重載（+與<<）

/*
*作者：lws
*完成時間：2014/6/12
*輸入：3 4 5 -10 3 4 5 5 3 4
*輸出：c1+c2=(8.00-6.00i) c1+d=(8.00+4.00i) d+c1=(8.00+4.00i)
*/
#include <iostream>
#include <iomanip>
//#include <cstdio>
using namespace std;
class Complex
{
public:
    Complex():real(0),imag(0){}
    Complex(double r,double i):real(r),imag(i){}
    Complex operator+(Complex &c);
    Complex operator+(double &d);
    friend Complex operator+(double &d,Complex &c);
    friend ostream& operator<<(ostream& output,const Complex &c);
private:
    double real;
    double imag;
};
Complex Complex::operator+(Complex &c)
{
    return Complex(real+c.real,imag+c.imag);
}
Complex Complex::operator+(double &d)
{
    return Complex(real+d,imag);
}
Complex operator+(double &d,Complex &c)
{
    return Complex(d+c.real,c.imag);
}
ostream& operator<<(ostream& output,const Complex &c)
{
    output<<setiosflags(ios::fixed)<<setprecision(2)<<"("<<c.real;
    if(c.imag>=0) output<<"+";
    output<<c.imag<<"i)";
    return output;
}
int main()
{
    //freopen("a.txt","r",stdin);
    //測試複數加複數
    double real,imag;
    cin>>real>>imag;
    Complex c1(real,imag);
    cin>>real>>imag;
    Complex c2(real,imag);
    Complex c3=c1+c2;
    cout<<"c1+c2="<<c3<<endl;
    //測試複數加實數
    double d;
    cin>>real>>imag;
    cin>>d;
    c3=Complex(real,imag)+d;
    cout<<"c1+d="<<c3<<endl;
    //測試實數加複數
    cin>>d;
    cin>>real>>imag;
    c1=Complex(real,imag);
    c3=d+c1;
    cout<<"d+c1="<<c3<<endl;
    //fclose(stdin);
    return 0;
}
           

運作結果：