C++习题 复数类--重载运算符+

Description

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。

Input

两个复数

Output

复数之和

Sample Input

3 4
5 -10

Sample Output

(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;
}