计算器制作步骤

1、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

2、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(

3、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(

4、IDC_MUTIPLY, 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

5、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, F

6、uncNone;（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voi

7、d 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_

8、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 CCalculatorD

9、lg: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);elsem_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 CC

10、alculatorDlg:OnAdd() /加/ TODO: Add your control notification handler code hereCalculate();m_operator=OpAdd;void CCalculatorDlg:OnMinus()/减/ TODO: Add your control notification handler code hereCalculate();m_operator=OpSubtract;void CCalculatorDlg:OnMutiply()/乘/ TODO: Add your control notification ha

11、ndler code hereCalculate();m_operator=OpMultiply;void CCalculatorDlg:OnDivid()/除/ TODO: Add your control notification handler code hereCalculate();m_operator=OpDivide;void CCalculatorDlg:OnSign() /处理正负号/ TODO: Add your control notification handler code herem_operand*=-1;UpdateDisplay();void CCalcula

12、torDlg:OnEqual()/处理等号/ TODO: Add your control notification handler code hereCalculate();m_operator=OpNone;void CCalculatorDlg:OnSqrt()/处理开根号/ TODO: Add your control notification handler code herem_func=FuncSqrt;Run_Func();void CCalculatorDlg:OnRecip() /求倒数1/x/ TODO: Add your control notification han

13、dler code herem_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;els

14、e 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 CC

15、alculatorDlg: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

16、为零"elsefloat 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 herem_operator = OpNone;m_operand = 0;m_accum = 0;m_bOperandAvail = FAL