OJ—— 复数类--重载运算符2+

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#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&,Complex &);    void display();private:    double real;    double imag;};Complex Complex::operator+(Complex &c2){    Complex c;    c.real=real+c2.real;    c.imag=imag+c2.imag;    return c;}Complex Complex::operator+(int &i){  return  Complex(real+i,imag);} Complex operator+(int&i,Complex &c2) {    return Complex(c2.real+i,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;}

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