計算器制作步驟

1、簡易計算器制作步驟：1、創(chuàng)建基于對話框的MFC(EXE)應(yīng)用程序Calculator；2、在對話框窗體上順序創(chuàng)建0到9十個數(shù)字按鈕，并設(shè)置其標識符分別為IDC_0到IDC_9，其它按鈕按下表設(shè)置屬性：3、按表2添加各運算按鈕的消息處理函數(shù)4、為使0到9十個數(shù)字按鈕響應(yīng)相同的消息處理函數(shù)，定義宏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);/注意先向類中添加protected 型成員函數(shù)OnOperandInput，然后再屏蔽掉類中的該函數(shù)聲明，在此位置添加此說明/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)/使用一個消

5、息函數(shù)來處理對某個ID范圍內(nèi)所有控件的命令響應(yīng)/AFX_MSG_MAPEND_MESSAGE_MAP()5、在頭文件CalculatorDlg.h中添加類型、成員變量及成員函數(shù)（1）自定義類型（定義在類外）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）成員變量及函數(shù)（此處應(yīng)定義為類CalculatorDlg的公有成員）float m_operand; /存儲當前輸入的操作數(shù)float m_accum; /存儲當前的計算結(jié)果BOOL m_bCoff; /標識當前輸入是否是小數(shù)float m_coff; /小數(shù)輸入時的系數(shù)Operator m_operator; /enum型變量用以標識當前運算符CalcError m_errorState; /enum型變量用以標識當前運算狀態(tài)Func m_func; /enum型變量用以標識當前運算函數(shù)類型BOOL m_bOperandAvail; /標識當前輸入是否為新輸入數(shù)字voi

7、d Calculate();/處理普通計算（用類向?qū)?，公有成員）void UpdateDisplay();/處理顯示（用類向?qū)?，公有成員）void Run_Func();/處理函數(shù)運算（用類向?qū)В谐蓡T）（3）為編輯框添加Cstring 變量m_result6、部分變量的初始化CCalculatorDlg:CCalculatorDlg(CWnd* pParent /*=NULL*/): CDialog(CCalculatorDlg:IDD, pParent)/AFX_DATA_INIT(CCalculatorDlg)m_result = _T();/AFX_DATA_INIT/ Note t

8、hat 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.h7、添加各功能代碼(1)數(shù)字輸入消息處理函數(shù)void CCalculatorDlg:OnOperandInput(UINT iID)A

9、SSERT(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）運算符消息處理函數(shù)void CCalculatorDlg:OnAdd() /加/ TODO: Add your contr

10、ol notification handler code hereCalculate();m_operator=OpAdd;void CCalculatorDlg:OnMinus()/減/ TODO: Add your control notification handler code hereCalculate();m_operator=OpSubtract;void CCalculatorDlg:OnMutiply()/乘/ TODO: Add your control notification handler code hereCalculate();m_operator=OpMulti

11、ply;void CCalculatorDlg:OnDivid()/除/ TODO: Add your control notification handler code hereCalculate();m_operator=OpDivide;void CCalculatorDlg:OnSign() /處理正負號/ TODO: Add your control notification handler code herem_operand*=-1;UpdateDisplay();void CCalculatorDlg:OnEqual()/處理等號/ TODO: Add your control

12、 notification handler code hereCalculate();m_operator=OpNone;void CCalculatorDlg:OnSqrt()/處理開根號/ TODO: Add your control notification handler code herem_func=FuncSqrt;Run_Func();void CCalculatorDlg:OnRecip() /求倒數(shù)1/x/ TODO: Add your control notification handler code herem_func=FuncRec;Run_Func();void

13、CCalculatorDlg:OnPoint()/處理小數(shù)點/ TODO: Add your control notification handler code herem_bCoff=1;UpdateDisplay();void CCalculatorDlg:Calculate()/處理計算,注意用類向?qū)忍砑哟顺蓡T函數(shù)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

14、;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()/處理求根和求倒if (m_errorSta

15、te != 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()/處理顯示if(GetSafeHwnd()=NULL)return;if(m_errorState!=ErrNone)m_result=除數(shù)不能為零;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() /處理清空/ TODO: Add your control notification handler code herem_operator = OpNone;m_operand = 0;m_accum = 0;m_bOperandAvail = FALSE;m