有组合框的窗口程序

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在窗口中建立一个下拉菜单式的组件，计算分数的四则运算！

头文件CFraction.h

class CFraction{private:int nume;  // 分子int deno;  // 分母int gcd(int nu, int de);public://构造函数及运算符重载的函数声明CFraction(int nu = 0, int de = 1);         //构造函数friend CFraction operator + (CFraction &c1,CFraction &c2);friend CFraction operator - (CFraction &c1,CFraction &c2);friend CFraction operator * (CFraction &c1,CFraction &c2);friend CFraction operator / (CFraction &c1,CFraction &c2);int get_nume();int get_deno();void Simplify();                    //化简（使分子分母没有公因子）};

MyCFraction.cpp

#include"stdafx.h"#include"CFraction.h"using namespace std;CFraction::CFraction(int nu, int de){nume = nu;deno = de;}int CFraction::gcd(int nu, int de)    {    int t, r, a, b;   a = nu;  b = de;  if (a < b)       {    t = a;    a = b;                                     b = t;    }     while (b != 0)    {    r = a % b;    a = b;    b = r;    }    return a;    }  void CFraction::Simplify() {  int n ;if(nume < 0){n = gcd(-nume, deno);}else{n = gcd(nume, deno);}nume = nume / n;  deno = deno / n; }  CFraction operator + (CFraction &c1,CFraction &c2){CFraction c;c.nume = c1.nume * c2.deno + c2.nume * c1.deno;c.deno = c1.deno * c2.deno;return c;}CFraction operator - (CFraction &c1,CFraction &c2){CFraction c;c.nume = c1.nume * c2.deno - c2.nume * c1.deno;c.deno = c1.deno * c2.deno;return c;}CFraction operator * (CFraction &c1,CFraction &c2){CFraction c;c.nume = c1.nume * c2.nume;c.deno = c1.deno * c2.deno;return c;}CFraction operator / (CFraction &c1,CFraction &c2){CFraction c;c.nume = c1.nume * c2.deno;c.deno = c1.deno * c2.nume;return c;}int CFraction::get_nume(){return this->nume;}int CFraction::get_deno(){return this->deno;}

buttonj按钮的程序：

不要忘记头文件：#include"CFraction.h"

void C分数拓展Dlg::OnBnClickedButton1(){// TODO: 在此添加控件通知处理程序代码UpdateData(); //将把界面上各控件输入的值“捕获”到与之关联的变量中CFraction c1(cf1_nume, cf1_deno), c2(cf2_nume, cf2_deno), c(0, 1);if(sign == '+'){c = c1 + c2;}else if(sign == '-'){c = c1 - c2;}else if(sign == '*'){c = c1 * c2;}else if(sign == '/'){c = c1 / c2;}c.Simplify();c_nume = c.get_nume();c_deno = c.get_deno();UpdateData(FALSE);}

运行窗口：

加法：

减法：

乘法：

除法：