[YTu]_2441 (C++习题 复数类--重载运算符2+)

#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 &c2);
	Complex operator+(int &i);
	friend Complex operator+(int &i,Complex &);
	void display();
private:
	double real;
	double imag;
};
Complex Complex:: operator+(Complex &c2)
{
    return Complex(real+c2.real,imag+c2.imag);
}
Complex Complex::operator+(int &i)
{
    return Complex(real+i,imag);
}
Complex operator+(int &i,Complex &c2)
{
    return Complex(i+c2.real,c2.imag);
}
void Complex::display()
{
    cout<<"("<<real<<','<<imag<<"i)"<<endl;
}
int main()
{
    double real,imag;
	cin>>real>>imag;
	Complex c1(real,imag);
	cin>>real>>imag;
	Complex c2(real,imag);
	cout<<setiosflags(ios::fixed);
	cout<<setprecision(2);
    Complex c3=c1+c2;
    cout<<"c1+c2=";
    c3.display();
    int i;
    cin>>real>>imag;
    cin>>i;
    c3=Complex(real,imag)+i;
    cout<<"c1+i=";
    c3.display();
    cin>>i;
    cin>>real>>imag;
    c1=Complex(real,imag);
    c3=i+c1;
    cout<<"i+c1=";
    c3.display();
    return 0;
}