定义一个复数类Complex，重载运算符“+”，使之能用于复数的加法运算。将运算符函数重载为非成员、非友元的普通函数。编写程序，求两个复数之和。

两个复数

复数之和

3 4

5 -10

(8.00,-6.00i)
#include <iostream>

#include <iomanip>

using namespace std;

class Complex

{

public:

    Complex();

    Complex(double r,double i);

    double get_real();

    double get_imag();

    void display();

private:

    double real;

    double imag;

};

Complex::Complex()

{

    return;

}

Complex::Complex(double r,double i)

{

    real=r;imag=i;

}

double Complex::get_real()

{

    return real;

}

double Complex::get_imag()

{

    return imag;

}

void Complex::display()

{

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

}

Complex operator +(Complex a,Complex b)

{

    double i,j;

    i=a.get_real() +b.get_real();

    j=a.get_imag() +b.get_imag();

    Complex c(i,j);

    return c;

}  

int main()

{

    double real,imag;

    cin>>real>>imag;

    Complex c1(real,imag);

    cin>>real>>imag;

    Complex c2(real,imag);

    Complex c3=c1+c2;

    cout<<setiosflags(ios::fixed);

    cout<<setprecision(2);

    c3.display();

    return 0;

}