第九周任务三

ゞ浴缸里的玫瑰 2022-06-13 12:24 253阅读 0赞

/* 
    实验内容:定义分数类中<<和>>运算符重载 
    * 程序的版权和版本声明部分  
    * Copyright (c) 2011, 烟台大学计算机学院学生  
    * All rights reserved.  
    * 文件名称： 定义分数类中<<和>>运算符重载                            
    * 作    者：  薛广晨                             
    * 完成日期：  2012       年  4    月  14      日  
    * 版 本号：  x1.0           
    */
    //【任务3】接第8周任务3，定义分数类中<<和>>运算符重载，实现分数的输入输出，改造原程序中对运算结果显示方式，使程序读起来更自然。
    #include<iostream>
    
    using namespace std;
    
    class CFraction
    {
    private:
    	int nume;  // 分子
    	int deno;  // 分母
     public:
    	CFraction(int nu = 0, int de = 1) : nume(nu), deno(de){};   //构造函数，初始化用
    	void output1();
    
    	friend ostream& operator << (ostream &,CFraction &);
    	friend istream& operator >> (istream &,CFraction &);
    
    	CFraction operator+(CFraction &c1);
    	CFraction operator-(CFraction &c1);
    	CFraction operator*(CFraction &c1);
    	CFraction operator/(CFraction &c1);
    
    	CFraction operator-();//取反
    
    	//比较运算符(二目)的重载
    	bool operator > (CFraction &c1);
    	bool operator < (CFraction &c1);
    	bool operator >= (CFraction &c1);
    	bool operator <= (CFraction &c1);
    	bool operator == (CFraction &c1);
    	bool operator != (CFraction &c1);
    
    };
    
    ostream& operator << (ostream &ouput, CFraction &c)
    {  
    	int i;  
        if(c.deno == 0)  
        cout<<"error"<<endl; 
    	if(c.nume >= 0)
    	{
    		if(c.deno < c.nume)i = c.deno;
    	    else i = c.nume;
    	    for(; i > 0; --i)
    	    {
    			if(c.nume % i == 0 && c.deno % i == 0)
    		    {
    				c.nume = c.nume / i;
    			    c.deno = c.deno / i;
    			    break;
    	        }
             }
    	     ouput << c.nume << "/" << c.deno << endl; 
    	}
    	else 
    	{
    		c.nume = -c.nume;
    		if(c.deno < c.nume)i = c.deno;
    	    else i = c.nume;
    	    for(; i > 0; --i)
    	    {
    			if(c.nume % i == 0 && c.deno % i == 0)
    		    {
    				c.nume = c.nume / i;
    			    c.deno = c.deno / i;
    			    break;
    	        }
             }
    	     ouput << -c.nume << "/" << c.deno << endl; 
    	}
        return ouput;
    }  
    
    istream& operator >> (istream &input, CFraction &c)
    {
    	char c1;
    	cout << "请输入一个分数(格式：x/y)：";
    	input >> c.nume >> c1 >> c.deno;
    	do
    	{
    		if(c1 == '/')break;
    		else
    		{
    			cout << "格式错误，请重新输入一个分数(格式：x/y)：";
    			input >> c.nume >> c1 >> c.deno;
    		}
    	}while(1);
    	return input;
    }
    
    CFraction CFraction :: operator+(CFraction &c1)
    { 
    	CFraction c2;  
        c2.deno = deno * c1.deno;  
        c2.nume = nume * c1.deno + c1.nume * deno;  
        return c2;  
    }  
    
    CFraction CFraction :: operator-(CFraction &c1)
    {  
    	CFraction c2;  
        c2.deno = deno * c1.deno;  
        c2.nume = nume * c1.deno - c1.nume * deno;  
        return c2;  
    }  
    
    CFraction CFraction :: operator*(CFraction &c1)
    {  
    	CFraction c2;  
        c2.deno = deno * c1.deno;  
        c2.nume = nume * c1.nume;  
        return c2;  
    }  
    
    CFraction CFraction :: operator/(CFraction &c1)
    {  
    	CFraction c2;  
        c2.deno = deno * c1.nume;  
        c2.nume = nume * c1.deno;  
        return c2;  
    }  
    
    CFraction CFraction :: operator-()//取反
    {
    	CFraction c2; 
    	c2.nume = -nume;
    	c2.deno = deno;
    
    	return c2;
    }
    
    void CFraction :: output1()  
    {  
    	cout << nume << "/" << deno << endl;  
    } 
    
    //比较运算符(二目)的重载
    bool CFraction :: operator > (CFraction &c1)
    {
    	CFraction c2, c3;
    	c2.nume = nume * c1.deno;
    	c3.nume = c1.nume * deno;
    	if(c2.nume > c3.nume)return true;
    	else return false;
    }
    
    bool CFraction :: operator < (CFraction &c1)
    {
    	CFraction c2, c3;
    	c2.nume = nume * c1.deno;
    	c3.nume = c1.nume * deno;
    	if(c2.nume < c3.nume)return true;
    	else return false;
    }
    
    bool CFraction :: operator >= (CFraction &c1)
    {
    	CFraction c2, c3;
    	c2.nume = nume * c1.deno;
    	c3.nume = c1.nume * deno;
    	if(c2.nume < c3.nume)return false;
    	else return true;
    }
    
    bool CFraction :: operator <= (CFraction &c1)
    {
    	CFraction c2, c3;
    	c2.nume = nume * c1.deno;
    	c3.nume = c1.nume * deno;
    	if(c2.nume > c3.nume)return false;
    	else return true;
    }
    
    bool CFraction :: operator == (CFraction &c1)
    {
    	CFraction c2, c3;
    	c2.nume = nume * c1.deno;
    	c3.nume = c1.nume * deno;
    	if((c2.nume >= c3.nume) && (c2.nume <= c3.nume))return true;
    	else return false;
    }
    
    bool CFraction :: operator != (CFraction &c1)
    {
    	CFraction c2, c3;
    	c2.nume = nume * c1.deno;
    	c3.nume = c1.nume * deno;
    	if((c2.nume > c3.nume) || (c2.nume < c3.nume))return true;
    	else return false;
    }
    
    void main()
    {
    	CFraction c1, c2, c3;
    	cin >> c1 >> c2;
    	cout <<"c1 = ";
    	c1.output1();
    	cout <<"c2 = ";
    	c2.output1();
    
    	c3 = c1 + c2;
    	cout << "c1 + c2 = " << c3;
        
    	c3 = c1 - c2;
    	cout << "c1 - c2 = " << c3;
    
    	c3 = c1 * c2;
    	cout << "c1 * c2 = " << c3;
    
    	c3 = c1 / c2;
    	cout << "c1 / c2 = " << c3;
    
    	c3 = -c1;
    	cout << "-c1 = " << c3;
    
    	cout << endl;
    	
    	cout<<"下面比较两个分数的大小：\n";
    	if (c1 > c2) cout << "c1 > c2" << endl;
    	if (c1 < c2) cout << "c1 < c2" << endl;
    	if (c1 == c2) cout << "c1 ＝ c2" << endl; 
    	if (c1 != c2) cout << "c1 ≠ c2" << endl;
    	if (c1 >= c2) cout << "c1 ≥ c2" << endl;
    	if (c1 <= c2) cout << "c1 ≤ c2" << endl;
    	cout<<endl;
        
    
    	system("pause");
    }

![1334413841_1915.jpg][]  
上机感言：感觉挺爽的，可以直接输入与输出

[1334413841_1915.jpg]: https://img-my.csdn.net/uploads/201204/14/1334413841_1915.jpg