通过运算符重载实现复数运算

#include<iostream>
using namespace std;
class Complex
{
public:
    // 带缺省值的构造函数
    Complex(double real = 0, double image = 0)
    {
        cout << "带缺省值的构造函数" << endl;
        _real = real;
        _image = image;
    }
    // 析构函数
    ~Complex()
    {
        cout << "析构函数" << endl;
    }
    // 拷贝构造函数
    Complex(const Complex& d)
    {
        cout << "拷贝构造函数" << endl;
        _real = d._real;
        _image = d._image;
    }
    // 赋值运算符重载
    Complex& operator= (const Complex& d)
    {
        cout << "赋值运算符重载" << endl;
        if (&d != this)
        {
            _real = d._real;
            _image = d._image;
        }

        return *this;
    }
    void Display()
    {
        cout << "real = " << _real << "  " << "image = " << _image << endl;
    }

public:
    Complex& operator++()//前置++
    {
        _real++;
        return *this;
    }
    Complex operator++(int)//后置++ int为标示符区分前置++和后置++
    {
        Complex tmp(*this);
        _real++;
        return tmp;
    }

    Complex& operator--()//前置--
    {
        _real--;
        return *this;
    }
    Complex operator--(int)//后置--
    {
        Complex tmp(*this);
        _real--;
        return tmp;
    }

    Complex operator+(const Complex& c)
    {
        Complex tmp;
        tmp._real = _real + c._real;
        tmp._image = _image + c._image;
        return tmp;
    }
    Complex operator-(const Complex& c)
    {
        Complex tmp;
        tmp._real = this->_real - c._real;
        tmp._image = this->_image - c._image;
        return tmp;
    }

    Complex& operator-=(const Complex& c)
    {
        _real -= c._real;
        _image -= c._image;
        return *this;
    }
    Complex& operator+=(const Complex& c)
    {
        _real += c._real;
        _image += c._image;
        return *this;
    }

    Complex operator*(const Complex& c)
    {
        Complex tmp;
        tmp._real = (_real * c._real) - (_image * c._image);
        tmp._image = (_real * c._image) + (_image * c._real);
        return tmp;
    }
    Complex operator/(const Complex& c)
    {
        Complex tmp;
        double t = (c._real * c._real) + (c._image * c._image);
        tmp._real = (_real * c._real - _image * c._image) / t;
        tmp._image = (_real * c._image + _image * c._real) / t;
        return tmp;
    }

private:
    double _real;       // 实部
    double _image;      // 虚部
};
void TestMultiply()
{
    Complex c1(3.3, 1.1), c2(1.1, 2.2);
    Complex c3;
    c3 = c1 * c2; //(1.21,8.47)
    c3.Display();
}
void TestDivide()
{
    Complex c1(3.3, 1.1), c2(1.1, 2.2);
    Complex c3;
    c3 = c1 / c2; //(0.2,1.4)
    c3.Display();
}
void TestAdd_Reduce()
{
    Complex c1(4.3, 2.1), c2(1.5, 6.5), c3;
    c3 = c2 + c1;
    c3.Display();//(5.8,8.6)
    c3 = c2 - c1;//(2.2,1.1)
    c3.Display();
}

int main()
{
    Complex c1(2.2, 1.1);
    Complex c2(c1);//代入法拷贝构造
    c1.Display();
    c2.Display();
    Complex c3 = c1;//赋值法拷贝构造
    c3.Display();
    Complex c4(3.3, 1.1);
    c1 = c4;//赋值运算符重载
    c1.Display();

    ++c4;//(4.3,1.1)
    c4.Display();
    --c4;//(3.3,1.1)
    c4.Display();
    c3 = c4++;
    c3.Display();//(3.3,1.1)
    c4.Display();//(4.3,1.1)
    c4 -= c1;// (1,0)
    c4.Display();
    c4 += c1;//(4.3,1.1)
    c4.Display();

    TestAdd_Reduce();
    TestMultiply();
    TestDivide();
    getchar();
    return 0;
}

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