C++

复数类的运算

#include <iostream>
using namespace std;

class Complex
{
public:
Complex(double r=0, double i=0):real(r), imag(i){ }
friend Complex operator+(Complex c1,Complex c2) //重载双目运算符'+'
{
Complex c3;
c3.real=c1.real+c2.real;
c3.imag=c1.imag+c2.imag;
return c3;
}
Complex operator-=(Complex c1) //重载双目运算符'-='
{
return Complex(real-=c1.real,imag-=c1.imag);
}
Complex operator-(Complex c2) //重载双目运算符'-'
{
return Complex(real-c2.real,imag-c2.imag);
}
void Display() const;
private:
double real;
double imag;
};

void Complex::Display() const
{
cout << "(" << real << ", " << imag << ")" << endl;
}

int main()
{
double r, m;
cin >> r >> m;
Complex c1(r, m);
cin >> r >> m;
Complex c2(r, m);
Complex c3 = c1+c2;
c3.Display();
c3 = c1-c2;
c3.Display();
c3 -= c1;
c3.Display();
return 0;
}