分数运算窗口（下拉式）

水深无声 2022-06-11 00:15 111阅读 0赞

//【任务2 拓展（选做）】将上面的输入运算符的编辑框换为下拉列表框，使之只能选“+‐*/”。
    //头文件 cfrac1.h
    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 output();
    	int getnume(){return nume;}
    	int getdeno(){return deno;}
    
    	CFraction operator+(CFraction &c1);
    	CFraction operator-(CFraction &c1);
    	CFraction operator*(CFraction &c1);
    	CFraction operator/(CFraction &c1);
    
    };
    
    
    //cfrac1.cpp文件
    #include "stdafx.h"
    
    #include "cfrac1.h"
    
    using namespace std;
    
    CFraction CFraction :: operator+(CFraction &c1)
    { 
    	CFraction c2;  
        c2.deno = deno * c1.deno;  
        c2.nume = nume * c1.deno + c1.nume * deno; 
    	c2.output();
        return c2;  
    }  
    
    CFraction CFraction :: operator-(CFraction &c1)
    {  
    	CFraction c2;  
        c2.deno = deno * c1.deno;  
        c2.nume = nume * c1.deno - c1.nume * deno;
    	c2.output();
        return c2;  
    }  
    
    CFraction CFraction :: operator*(CFraction &c1)
    {  
    	CFraction c2;  
        c2.deno = deno * c1.deno;  
        c2.nume = nume * c1.nume; 
    	c2.output();
        return c2;  
    }  
    
    CFraction CFraction :: operator/(CFraction &c1)
    {  
    	CFraction c2;  
        c2.deno = deno * c1.nume;  
        c2.nume = nume * c1.deno; 
    	c2.output();
        return c2;  
    }  
    
    void CFraction :: output()  
    {  
    	int i;  
    	if(nume >= 0)
    	{
    		if(deno < nume)i = deno;
    	    else i = nume;
    	    for(; i > 0; --i)
    	    {
    			if(nume % i == 0 && deno % i == 0)
    		    {
    				nume = nume / i;
    			    deno = deno / i;
    			    break;
    	        }
             } 
    	}
    	else 
    	{
    		nume = -nume;
    		if(deno < nume)i = deno;
    	    else i = nume;
    	    for(; i > 0; --i)
    	    {
    			if(nume % i == 0 && deno % i == 0)
    		    {
    				nume = nume / i;
    			    deno = deno / i;
    			    break;
    	        }
             }
    		  nume = -nume;
    	}
    
    }
    
    //button
    void CCFraction1Dlg::OnBnClickedButton1()
    {
    	// TODO: 在此添加控件通知处理程序代码
    	UpdateData();//将界面上的各控件输入的值“捕获”到与之关联的变量中
    	CFraction t1(m_nu1, m_de1);
    	CFraction t2(m_nu2, m_de2);
    	CFraction t3;
    	if (m_a=="+")
    		t3 = t1+t2;
    	else if (m_a == "-")
    		t3 = t1-t2;
    	else if (m_a=="*")
    		t3 = t1*t2;
    	else if (m_a=="/")
    		t3 = t1/t2;
    	m_nu3 = t3.getnume();
    	m_de3 = t3.getdeno();
    	UpdateData(FALSE);//用m_area的值更新界面上对应的控件的值并实现显示
    }

![1338207674_1534.jpg][]![1338207680_9640.jpg][]![1338207687_3364.jpg][]

上机感言：多谢贺老师帮我找出错误所在，因为画红圈地方的一个小小的空格使得整个程序运行结果不对，以后的加倍的仔细啊，

[1338207674_1534.jpg]: https://img-my.csdn.net/uploads/201205/28/1338207674_1534.jpg
[1338207680_9640.jpg]: https://img-my.csdn.net/uploads/201205/28/1338207680_9640.jpg
[1338207687_3364.jpg]: https://img-my.csdn.net/uploads/201205/28/1338207687_3364.jpg