#include<iostream>

using namespace std;

class Complex{

public:

    Complex(double r=0.0,double i=0.0):real(r),imag(i){}

    Complex operator + (const Complex &c2) const;

    Complex operator - (const Complex &c2) const;

    void display() const;

private:

    double real,imag;

};

void Complex::display() const{

    cout<<"("<<real<<","<<imag<<")"<<endl;

}

Complex Complex::operator + (const Complex &c2) const{

    return Complex(real+c2.real,imag+c2.imag);//调用Complex构造函数创建一个临时对象并返回它

                                              //Complex c(real+c2.real,imag+c2.imag);

                                              //return c;

}

Complex Complex::operator - (const Complex &c2) const{

    return Complex(real-c2.real,imag-c2.imag);

}

int main(){

    Complex c1(,),c2(,),c3;

    cout<<"c1=";c1.display();

    cout<<"c2=";c2.display();

    c3=c1-c2;

    cout<<"c2=c1-c2=";c3.display();

    c3=c1+c2;

    cout<<"c2=c1+c2=";c3.display();

    return ;

}