运算符重载

/*

定义复数类complex，包括私有数据成员实部real和虚部image。定义该类的构造，拷贝构造，析构函数。为该类重载运算符+，-（友元函数），前置和后置++，--（成员函数），插入符和提取符<<，>>（友元函数）。在main函数里定义复数对象，测试重载的这些运算符。

*/

#include<iostream>

#include<string>

using namespace std;

class Complex

{

public:

    Complex(int real1=0,int image1=0) :real(real1),image(image1)

{

}

// Complex(Complex & con_recomplex)

// {

// real=con_recomplex.real;

// image=con_recomplex.image;

//     cout<<"complex constructor one!"<<endl;

// }

~Complex()

{

};

    friend Complex operator+(const Complex &a1, const Complex &a2);

friend Complex operator-(const Complex &a1, const Complex &a2);

Complex operator++();

Complex operator++(int);

Complex operator--();

Complex operator--(int);

friend ostream& operator<<(ostream& os, const Complex&a3);

friend istream& operator>>(istream& is, Complex&a3);

private:

    int real;

int image;

};

Complex operator+(const Complex &a1, const Complex &a2)

{

    return Complex(a1.real + a2.real, a1.image + a2.image);

}

Complex operator-(const Complex &a1, const Complex &a2)

{

    return Complex(a1.real - a2.real, a1.image - a2.image);

}

Complex Complex::operator++()

{

    ++real;

++image;

return *this;

}

Complex Complex::operator++(int)

{

    Complex a = *this;

++(*this);

return a;

}

Complex Complex::operator--()

{

    --real;

--image;

return *this;

}

Complex Complex::operator--(int)

{

    Complex a = *this;

--(*this);

return *this;

}

ostream& operator<<(ostream& os, const Complex& a3)

{

    os<< a3.real << "+" << a3.image << "i";

return os;

}

istream& operator>>(istream& is, Complex&a3)

{

    is >> a3.real >> a3.image;

return is;

}

int main()

{

    Complex a4(4,5), a5(6,7),a6;

cout << "a4:" << a4 << endl;

cout << "a5:" << a5 << endl;

cin >> a4;cin >> a5;

cout << "重新输入后 a4:" << a4 << endl;

cout << "重新输入后 a5:" << a5 << endl;

a6 = a4 + a5;

    cout << a6 << endl;

a6 = a4 - a5;

cout << a6 << endl;

cout <<"++a4:"<<++a4 << endl;

cout <<"a5++:" <<a5++ << endl;

cout << "--a4:" << --a4 << endl;

cout <<"a5-:" << a5-- << endl;

return 0;

}