简易计算器制作步骤：1、创建基于对话框的MFC(EXE)应用程序Calculator；2、在对话框窗体上顺序创建0到9十个数字按钮，并设置其标识符分别为IDC_0到IDC_9，其它按钮按下表设置属性：3、按表2添加各运算按钮的消息处理函数4、为使0到9十个数字按钮响应相同的消息处理函数，定义宏ON_COMMAND_RANGE (1) // CalculatorDlg.h//{{AFX_MSG(CCalculatorDlg)virtual BOOL OnInitDialog();afx_msg void OnSysCommand(UINT nID, LPARAM lParam);afx_msg void OnPaint();afx_msg HCURSOR OnQueryDragIcon();afx_msg void OnAdd();afx_msg void OnMinus();afx_msg void OnMutiply();afx_msg void OnDivid();afx_msg void OnClear();afx_msg void OnSign();afx_msg void OnPoint();afx_msg void OnEqual();afx_msg void OnSqrt();afx_msg void OnRecip();afx_msg void OnOperandInput(UINT iID);//注意先向类中添加protected 型成员函数OnOperandInput，然后再屏蔽掉类中的该函数声明，在此位置添加此说明//}}AFX_MSG(2)//CalculatorDlg.cppBEGIN_MESSAGE_MAP(CCalculatorDlg, CDialog)//{{AFX_MSG_MAP(CCalculatorDlg)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_ADD, OnAdd)ON_BN_CLICKED(IDC_MINUS, OnMinus)ON_BN_CLICKED(IDC_MUTIPL Y, OnMutiply)ON_BN_CLICKED(IDC_DIVID, OnDivid)ON_BN_CLICKED(IDC_CLEAR, OnClear)ON_BN_CLICKED(IDC_SIGN, OnSign)ON_BN_CLICKED(IDC_POINT, OnPoint)ON_BN_CLICKED(IDC_EQUAL, OnEqual)ON_BN_CLICKED(IDC_SQRT, OnSqrt)ON_BN_CLICKED(IDC_RECIP, OnRecip)ON_COMMAND_RANGE(IDC_0,IDC_9,OnOperandInput)//使用一个消息函数来处理对某个ID范围内所有控件的命令响应//}}AFX_MSG_MAPEND_MESSAGE_MAP()5、在头文件CalculatorDlg.h中添加类型、成员变量及成员函数（1）自定义类型（定义在类外）enum Operator { OpNone,OpAdd,OpSubtract,OpMultiply,OpDivide};enum CalcError { ErrNone,ErrDivideByZero};enum Func { FuncSin, FuncTan, FuncCos, FuncSqrt, FuncSqre, FuncLn, FuncLog,FuncN, FuncRec, FuncExp, FuncNone};（2）成员变量及函数（此处应定义为类CalculatorDlg的公有成员）float m_operand; //存储当前输入的操作数float m_accum; //存储当前的计算结果BOOL m_bCoff; //标识当前输入是否是小数float m_coff; //小数输入时的系数Operator m_operator; //enum型变量用以标识当前运算符CalcError m_errorState; //enum型变量用以标识当前运算状态Func m_func; //enum型变量用以标识当前运算函数类型BOOL m_bOperandAvail; //标识当前输入是否为新输入数字void Calculate();//处理普通计算（用类向导，公有成员）void UpdateDisplay();//处理显示（用类向导，公有成员）void Run_Func();//处理函数运算（用类向导，公有成员）（3）为编辑框添加Cstring 变量m_result6、部分变量的初始化CCalculatorDlg::CCalculatorDlg(CWnd* pParent /*=NULL*/): CDialog(CCalculatorDlg::IDD, pParent){//{{AFX_DATA_INIT(CCalculatorDlg)m_result = _T("");//}}AFX_DATA_INIT// Note that LoadIcon does not require a subsequent DestroyIcon in Win32m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);m_coff=0.1;m_bCoff=0;m_errorState = ErrNone;m_bOperandAvail=FALSE;m_operator=OpNone;}另：在文件CalculatorDlg.cpp中添加#include "math.h"7、添加各功能代码(1)数字输入消息处理函数void CCalculatorDlg::OnOperandInput(UINT iID){ASSERT(iID >= IDC_0 && iID <= IDC_9);if(m_errorState!=ErrNone)return;if(!m_bOperandAvail)m_operand=0;if(!m_bCoff)m_operand=m_operand*10+(iID-IDC_0);else{m_operand=m_operand+(iID-IDC_0)*m_coff;m_coff*=0.1;}m_bOperandAvail=TRUE;UpdateDisplay();}（2）运算符消息处理函数void CCalculatorDlg::OnAdd() //加{// TODO: Add your control notification handler code here Calculate();m_operator=OpAdd;}void CCalculatorDlg::OnMinus()//减{// TODO: Add your control notification handler code here Calculate();m_operator=OpSubtract;void CCalculatorDlg::OnMutiply()//乘{// TODO: Add your control notification handler code here Calculate();m_operator=OpMultiply;}void CCalculatorDlg::OnDivid()//除{// TODO: Add your control notification handler code here Calculate();m_operator=OpDivide;}void CCalculatorDlg::OnSign() //处理正负号{// TODO: Add your control notification handler code here m_operand*=-1;UpdateDisplay();}void CCalculatorDlg::OnEqual()//处理等号{// TODO: Add your control notification handler code here Calculate();m_operator=OpNone;}void CCalculatorDlg::OnSqrt()//处理开根号{// TODO: Add your control notification handler code here m_func=FuncSqrt;Run_Func();}void CCalculatorDlg::OnRecip() //求倒数1/x{// TODO: Add your control notification handler code here m_func=FuncRec;Run_Func();}void CCalculatorDlg::OnPoint()//处理小数点// TODO: Add your control notification handler code herem_bCoff=1;UpdateDisplay();}void CCalculatorDlg::Calculate()//处理计算,注意用类向导先添加此成员函数{if(m_errorState!=ErrNone)return;if(m_bOperandAvail){if(m_operator==OpNone)m_accum=m_operand;else if(m_operator==OpMultiply)m_accum*=m_operand;else if(m_operator==OpDivide){if(m_operand==0)m_errorState=ErrDivideByZero;elsem_accum/=m_operand;}else if(m_operator==OpAdd)m_accum+=m_operand;else if(m_operator==OpSubtract)m_accum-=m_operand;}m_bOperandAvail=FALSE;m_bCoff=0;m_coff=0.1;UpdateDisplay();}void CCalculatorDlg::Run_Func()//处理求根和求倒{if (m_errorState != ErrNone)return;if (m_bOperandAvail){if(m_func==FuncSqrt)m_operand=sqrt(m_operand);if(m_func==FuncRec)m_operand=1/m_operand;}UpdateDisplay();}void CCalculatorDlg::UpdateDisplay()//处理显示{if(GetSafeHwnd()==NULL)return;if(m_errorState!=ErrNone)m_result="除数不能为零";else{float lval=(m_bOperandAvail)?m_operand:m_accum;m_result.Format(_T("%f"),lval);int i=m_result.GetLength();while(m_result.GetAt(i-1)=='0'){m_result.Delete(i-1,1);i-=1;}}UpdateData(FALSE);}void CCalculatorDlg::OnClear() //处理清空{// TODO: Add your control notification handler code here m_operator = OpNone;m_operand = 0;m_accum = 0;m_bOperandAvail = FALSE;m_errorState = ErrNone;m_coff=0.1;m_bCoff=0;UpdateDisplay();}void CCalculatorDlg::Run_Func()//处理函数运算{if (m_errorState != ErrNone)return;if (m_bOperandAvail){if(m_func==FuncSqrt)m_operand=sqrt(m_operand);if(m_func==FuncRec)m_operand=1/m_operand;}UpdateDisplay();}。