复数四则

#include <iostream>
#include <cstdlib>
#include <limits>
using namespace std;

class MyComplex{
public:
    double a;
    double b;
public:
    MyComplex(double a = 0.0, double b = 0.0){
        this->a = a;
        this->b = b;
    }
    MyComplex& operator+(const MyComplex & c);
    MyComplex& operator-(const MyComplex & c);
    MyComplex& operator*(const MyComplex & c);
    MyComplex& operator/ (const MyComplex &c);
    
    friend ostream& operator<<(ostream &stream, MyComplex& mc);
    friend istream& operator>>(istream &stream, MyComplex& mc);
};


MyComplex& MyComplex::operator+(const MyComplex & c)
{
    
    this->a=a+c.a;
    this->b=b+c.b;
    return (*this);
}

MyComplex& MyComplex::operator-(const MyComplex & c)
{
    this->a=this->a-c.a;
    this->b=this->b-c.b;
    return (*this);
}

MyComplex& MyComplex::operator*(const MyComplex & c)
{
    this->a=a*c.a-b*c.b;
    this->b=a*c.b+b*c.a;
    return (*this);
}

MyComplex& MyComplex::operator/ (const MyComplex &c) {
    return *this = MyComplex((a*c.a+b*c.b)/(c.b*c.b+c.a*c.a),(b*c.a-a*c.b)/(c.b*c.b+c.a*c.a));
}


ostream& operator <<(ostream &stream, MyComplex& mc){    
    stream<< "(" << mc.a;
    stream.setf(std::ios::showpos);
    stream<< mc.b << "i)";
    stream.unsetf(std::ios::showpos);
    return stream;
}
istream& operator>>(istream &stream, MyComplex& mc){
    stream>>mc.a>>mc.b;
    return stream;
}

int main() {
    MyComplex z1, z2;
    cin >> z1;
    cin >> z2;
    
    cout<<z1.a<<" "<<z1.b<<endl;
    cout<<z2.a<<" "<<z2.b<<endl;
    
    cout << "z1 + z2 = "      << z1 + z2      << endl;
    cout << "z1 - z2 + z1 = " << z1 - z2 + z1 << endl;
    cout << "z1 * z2 - z1 = " << z1 * z2 - z1 << endl;
    cout << "z1 / z2 + z1 = " << z1 / z2 + z1 << endl;
    cout << "z2 - z1 / z1 = " << z2 - z1 / z1;
    // GCC及VC编译器在调试模式下会暂停，便于查看运行结果
#if ( defined(__DEBUG__) || defined(_DEBUG) )
    cin.ignore(numeric_limits<streamsize>::max(), '
');
    cin.get();
#endif
    return 0;
}