C++_Operator Overloading(运算符重载 | 计算有理数的加减乘除)

今天药忘吃喽~ 2022-09-30 09:51 155阅读 0赞

// OperatorT.cpp : 定义控制台应用程序的入口点。
    //
    
    #include "stdafx.h"
    #include <iostream>
    
    //运算符的重载 
    //计算有理数rational的 + - * /
    
    class Rational
    {
    public:
    	Rational();//构造函数初始化
    	Rational(int numer, int denom);
    	Rational operator +(Rational  d);// 
    	Rational operator -(Rational  d);
    	Rational operator *(Rational  d);
    	Rational operator /(Rational  d);
    
    	void print();
    private:
    	friend std::ostream &operator<<(std::ostream &os, Rational f);
    	//友元函数用friend声明，可以访问类中的私有变量
    
    	void normalize();//对分数简化处理
    	int nu;
    	int de;
    };
    Rational::Rational()
    {
    	nu = 0;
    	de = 0;
    }
    Rational::Rational(int numer, int denom)
    {
    	nu = numer;
    	de = denom;
    	normalize();//简化
    }
    Rational Rational::operator +(Rational  d)
    {
    	Rational r;
    	r.nu = nu *d.de + de*d.nu;
    	r.de = de * d.de;
    	return r;
    }
    
    Rational Rational::operator-(Rational  d)
    {
    	//Rational r;
    	//r.nu = nu *d.de - de*d.nu;
    	//r.de = de * d.de;
    	//return r;
    
    	d.nu = -d.nu;
    	return operator +(d);
    }
    
    Rational Rational::operator*(Rational  d)
    {
    	Rational r;
    	r.nu = nu * d.nu;
    	r.de = de * d.de;
    	return r;
    }
    Rational Rational::operator/(Rational   d)
    {
    	//Rational r;
    	//r.nu = nu * d.de;
    	//r.de = de * d.nu;
    	//return r;
    
    	int temp;
    	temp = d.nu;
    	d.nu = d.de;
    	d.de = temp;
    	return operator*(d);
    }
    void Rational::print()
    {
    	normalize();
    	if (nu%de == 0)
    	{
    		std::cout << nu / de << std::endl; //<< "\n" << "\n"
    	}
    	else
    	{
    		std::cout << nu << "/" << de  << std::endl;
    	}
    }
    //对分数的简化处理
    //1.分母为正
    //2.欧几里得算法对分数进行化简
    void Rational::normalize()
    {
    	if (de < 0)//分母小于0，分子分母都取负
    	{
    		nu = -nu;
    		de = -de;
    	}
    
    	int a = abs(nu);
    	int b = abs(de);
    	while (b > 0)   //好！
    	{
    		int t = a%b;
    		a = b;//被除数变除数，余数变被除数...循环..直到余数为0
    		b = t;
    	}
    	nu /= a;
    	de /= a;
    }
    //使用前先声明 // 对 << 进行重载
    std::ostream & operator<<(std::ostream & os, Rational f);
    int main()
    {
    	Rational r1(-3, 5), r2(-6, -9);
    	Rational r3, r4, r5, r6;
    
    	r3 = r1 + r2;
    	r4 = r1 - r2;
    	r5 = r1 * r2;
    	r6 = r1 / r2;
    
    	std::cout << "Src: "<<"\n";
    	std::cout << "r1= "; r1.print();
    	std::cout << "r2= "; r2.print();
    
    	std::cout << "Result: "<<"\n";
    	//std::cout << "r3= "; r3.print();
    	//std::cout << "r4= "; r4.print();
    	//std::cout << "r5= "; r5.print();
    	//std::cout << "r6= "; r6.print();//
    
    	//对<<重载 应用
    	std::cout <<"("<< r1 <<")"<< " + " <<"("<< r2  <<")"<< " = " << r1 + r2 << std::endl;
    	std::cout <<"("<< r1 <<")"<< " - " << "("<< r2  <<")"<< " = " << r1 - r2 << std::endl;
    	std::cout <<"("<< r1 <<")"<< " * " << "("<< r2  <<")"<< " = " << r1 * r2 << std::endl;
    	std::cout <<"("<< r1 <<")"<< " / " << "("<< r2  <<")" << " = " << r1 / r2 << std::endl;
    
    	system("pause");
    	return 0;
    }
    // 对 << 进行重载的实现
    std::ostream & operator<<(std::ostream & os, Rational f)
    {
    	Rational f1 = f;
    	f1.normalize();
    	os << f1.nu << "/" << f1.de;
    	return os;
    }

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[20170320232605683]: /images/20220706/762f96252eeb4c5aa6c15d959cd6e544.png