【C++】复数的运算符重载

标签：c++   类   复数   重载   运算符   

运算符重载的定义：

用户对于自定义类型的运算操作，例如复数的运算。需要重新定义运算符号（创建函数）。

        除了类属关系运算符"."、成员指针运算符".*"、作用域运算符"::"、sizeof运算符和三目运算符"?:"以外，C++中的所有运算符都可以重载。

复数的运算符重载如下：

<span style="font-size:18px;">

#include<iostream>
#include<string>
using namespace std;


class Complex;
Complex operator+(int x, Complex &c);
ostream& operator<<(ostream &out, const Complex &c);
istream& operator>>(istream &in, Complex &c);

class Complex
{
	friend istream& operator>>(istream &in, Complex &c);
	friend ostream& operator<<(ostream &out, const Complex &c);
	friend Complex operator+(int x, Complex &c);
public:
	Complex(const int real = 0, const int imag = 0) :m_real(real), m_imag(imag)
	{}
	~Complex()
	{}
	void Show()const
	{
		cout << "(" << m_real << "," << m_imag << ")" << endl;
	}



public:
	Complex operator+(int x)
	{
		return Complex(m_real + x, m_imag);
	}
	Complex operator+(Complex &c)
	{
		return Complex(m_real + c.m_real, m_imag + c.m_imag);
	}

	Complex operator-(Complex &c)
	{
		return Complex(m_real - c.m_real, m_imag - c.m_imag);
	}



	friend Complex operator+(int x, Complex &c)
	{
		return Complex(x + c.m_real, c.m_imag);
	}

	friend Complex operator-(int x, Complex &c)
	{
		return Complex(x - c.m_real, -c.m_imag);
	}

	Complex operator*(Complex &c);
	friend Complex operator*(int x, Complex &c);
	Complex operator/(Complex &c);
	friend Complex operator/(int x, Complex &c);
	Complex operator+=(Complex &c);
	Complex operator-=(Complex &c);
	Complex operator*=(Complex &c);
	Complex operator/=(Complex &c);

private:
	int m_real;
	int m_imag;
};




Complex Complex::operator/(Complex &c)
{
	Complex temp;

	temp.m_real = (m_real*c.m_real + m_imag*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);
	temp.m_imag = (m_imag*c.m_real - m_real*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);
	return temp;
}

Complex operator/(int x, Complex &c)
{
	Complex temp;

	temp.m_real = (x*c.m_real) / (c.m_real*c.m_real + c.m_imag*c.m_imag);
	temp.m_imag = (-x*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);
	return temp;
}

Complex Complex:: operator+=(Complex &c)
{
	m_real = m_real + c.m_real;
	m_imag = m_imag + c.m_imag;
	return *this;
}

Complex Complex::operator-=(Complex &c)
{
	m_real = m_real - c.m_real;
	m_imag = m_imag - c.m_imag;
	return *this;
}


Complex Complex:: operator*(Complex &c)
{
	return Complex(m_real*c.m_real - m_imag*c.m_imag, m_imag*c.m_real + m_real*c.m_imag);
}

Complex operator*(int x, Complex &c)
{
	return Complex(c.m_real*x, c.m_imag*x);
}

Complex Complex::operator*=(Complex &c)
{
	int i = m_real;
	m_real = m_real*c.m_real - m_imag*c.m_imag;
	m_imag = m_imag*c.m_real + i*c.m_imag;
	return *this;
}


Complex Complex:: operator/=(Complex &c)
{

	m_real = (m_real*c.m_real + m_imag*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);
	m_imag = (m_imag*c.m_real - m_real*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);
	return *this;
}
ostream& operator<<(ostream &out, const Complex &c)
{
	out << "(" << c.m_real << "," << c.m_imag << ")";
	return out;
}

istream& operator>>(istream &in, Complex &c)
{
	in >> c.m_real >> c.m_imag;
	return in;
}




int main()
{
	Complex c1(2, 1);
	Complex c2(3, 2);

	Complex c;
	
	c = c1 + c2;
	cout<<c1<<"+"<<c2<<"="<<c<<endl;

	c = c1 * c2;
	cout << c1 << "*" << c2 << "=" << c << endl;

	c = c1 / c2;
	cout << c1 << "*" << c2 << "=" << c << endl;

	c = 2 + c1;
	cout <<"2"<< "+" << c1 << "=" << c << endl;
	//    c1+=c2;
	//    cout<<c1<<endl;
	//    c1-=c2;
	//    cout<<c1<<endl;
	c1 *= c2;
	cout << c1 << endl;
	c1 /= c2;
	cout << c1 << endl;

	c = 4 / c1;
	cout << c << endl;
	 Complex c3;
	 cin>>c3;
	 cout<<c3;
	return 0;
}

</span>

运行结果：

【C++】复数的运算符重载

标签：c++   类   复数   重载   运算符   

原文地址：http://blog.csdn.net/irean_lau/article/details/46393651