calculatordlg.cpp

ＶＣ＋＋实现的一个计算器

// CalculatorDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Calculator.h"
#include "CalculatorDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCalculatorDlg dialog

CCalculatorDlg::CCalculatorDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CCalculatorDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CCalculatorDlg)
	m_NowValue = _T("0");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_LastValue   = 0;
	m_ButtonID    = 0;
	m_LastButtonID= 0;
}

void CCalculatorDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CCalculatorDlg)
	DDX_Control(pDX, IDC_REDUCE, m_Reduce);
	DDX_Control(pDX, IDC_MUTIPLY, m_Mutiply);
	DDX_Control(pDX, IDC_ADD, m_Add);
	DDX_Control(pDX, IDC_DIVIDE, m_Divide);
	DDX_Control(pDX, IDC_EQUAL, m_Equal);
	DDX_Control(pDX, IDC_POWER, m_Power);
	DDX_Control(pDX, IDC_POINT, m_Point);
	DDX_Control(pDX, IDC_NUM9, m_Num9);
	DDX_Control(pDX, IDC_NUM8, m_Num8);
	DDX_Control(pDX, IDC_NUM7, m_Num7);
	DDX_Control(pDX, IDC_NUM6, m_Num6);
	DDX_Control(pDX, IDC_NUM5, m_Num5);
	DDX_Control(pDX, IDC_NUM4, m_Num4);
	DDX_Control(pDX, IDC_NUM3, m_Num3);
	DDX_Control(pDX, IDC_NUM2, m_Num2);
	DDX_Control(pDX, IDC_NUM1, m_Num1);
	DDX_Control(pDX, IDC_NUM0, m_Num0);
	DDX_Control(pDX, IDC_EVOLUTION, m_Evolution);
	DDX_Control(pDX, IDC_BACKSPACE, m_BackSpace);
	DDX_Control(pDX, IDC_CLEAR, m_Clear);
	DDX_Text(pDX, IDC_EDIT, m_NowValue);
	DDV_MaxChars(pDX, m_NowValue, 25);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CCalculatorDlg, CDialog)
	//{{AFX_MSG_MAP(CCalculatorDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BACKSPACE, OnBackspace)
	ON_EN_SETFOCUS(IDC_EDIT, OnSetfocusEdit)
	ON_BN_CLICKED(IDC_CLEAR, OnClear)
	ON_BN_CLICKED(IDC_NUM1, OnNum1)
	ON_BN_CLICKED(IDC_NUM2, OnNum2)
	ON_BN_CLICKED(IDC_NUM3, OnNum3)
	ON_BN_CLICKED(IDC_NUM4, OnNum4)
	ON_BN_CLICKED(IDC_NUM5, OnNum5)
	ON_BN_CLICKED(IDC_NUM6, OnNum6)
	ON_BN_CLICKED(IDC_NUM7, OnNum7)
	ON_BN_CLICKED(IDC_NUM8, OnNum8)
	ON_BN_CLICKED(IDC_NUM9, OnNum9)
	ON_BN_CLICKED(IDC_NUM0, OnNum0)
	ON_BN_CLICKED(IDC_POINT, OnPoint)
	ON_BN_CLICKED(IDC_POWER, OnPower)
	ON_BN_CLICKED(IDC_ADD, OnAdd)
	ON_BN_CLICKED(IDC_REDUCE, OnReduce)
	ON_BN_CLICKED(IDC_MUTIPLY, OnMutiply)
	ON_BN_CLICKED(IDC_DIVIDE, OnDivide)
	ON_BN_CLICKED(IDC_EQUAL, OnEqual)
	ON_BN_CLICKED(IDC_EVOLUTION, OnEvolution)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCalculatorDlg message handlers

BOOL CCalculatorDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CCalculatorDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CCalculatorDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CCalculatorDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CCalculatorDlg::OnBackspace() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	m_NowValue = m_NowValue.Left(m_NowValue.GetLength() - 1);
	UpdateData(FALSE);
}

void CCalculatorDlg::OnSetfocusEdit() 
{
	// TODO: Add your control notification handler code here
	GetDlgItem(IDC_BACKSPACE)->SetFocus();
}

void CCalculatorDlg::OnClear() 
{
	// TODO: Add your control notification handler code here
	m_NowValue = "0";
	m_ButtonID = 0;
	m_LastButtonID = IDC_CLEAR;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum1() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
    	if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
	    	m_NowValue = "1";
    	else m_NowValue += "1";
	}
	else m_NowValue = "1";

	m_LastButtonID = IDC_NUM1;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum2() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
	    if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
		    m_NowValue = "2";
	    else m_NowValue += "2";
	}
	else m_NowValue = "2";

	m_LastButtonID = IDC_NUM2;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum3() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
	    if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
	    	m_NowValue = "3";
	    else m_NowValue += "3";
	}
	else m_NowValue = "3";

	m_LastButtonID = IDC_NUM3;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum4() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
	    if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
		    m_NowValue = "4";
	    else m_NowValue += "4";
	}
	else m_NowValue = "4";

	m_LastButtonID = IDC_NUM4;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum5() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
	    if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
		   m_NowValue = "5";
	    else m_NowValue += "5";
	}
	else m_NowValue = "5";

	m_LastButtonID = IDC_NUM5;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum6() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
	    if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
		    m_NowValue = "6";
	    else m_NowValue += "6";
	}
	else m_NowValue = "6";

	m_LastButtonID = IDC_NUM6;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum7() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
	    if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
		     m_NowValue = "7";
	    else m_NowValue += "7";
	}
	else m_NowValue = "7";

	m_LastButtonID = IDC_NUM7;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum8() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
	    if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
		   m_NowValue = "8";
	    else m_NowValue += "8";
	}
	else m_NowValue = "8";

	m_LastButtonID = IDC_NUM8;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum9() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
	    if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
	    	m_NowValue = "9";
	    else m_NowValue += "9";
	}
	else m_NowValue = "9";

	m_LastButtonID = IDC_NUM9;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnNum0() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	if ( IDC_NUM1 <= m_LastButtonID && IDC_POINT >= m_LastButtonID)
	{
	    if ( 1 == m_NowValue.GetLength() && "0" == m_NowValue )
    		m_NowValue = "0";
	    else m_NowValue += "0";
	}
	else m_NowValue = "0";

	m_LastButtonID = IDC_NUM0;
	UpdateData(FALSE);
}

void CCalculatorDlg::OnPoint() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	for (int i=0;i<m_NowValue.GetLength();i++)
		if ( '.' == m_NowValue[i] ) return;
    m_NowValue += '.';
	m_LastButtonID = IDC_POINT;
	UpdateData(FALSE);
}

long double CCalculatorDlg::atold(const CString &value) const
{
	int PointPos = value.Find('.',0);
	int length   = value.GetLength();
	if ( -1 == PointPos ) PointPos = length;

	long double resultInt=0;
	for ( int i=0;i<PointPos;i++) resultInt = resultInt*10 + value[i]-'0';

	long double resultFloat=0;
	for ( i=length-1;i>PointPos;i--) 
		resultFloat = resultFloat*0.1 + (value[i]-'0')*0.1;

    return resultInt+resultFloat;
}

CString CCalculatorDlg::ldtoa(const long double &value) const 
{
	CString result;
	result.Format("%f",value);

	if( -1 != result.Find('.',0) )
	while ( '0' == result[result.GetLength()-1] )
		result.Delete(result.GetLength()-1);

	if ( "." == result.Right(1) ) result.Remove('.');
    return result;
}

long double CCalculatorDlg::compute(const CString &value)
{
	long double NowValue = atold(value);
	long double result;
	long i;

	switch (m_ButtonID)
	{
	case 0:
		result = m_LastValue = NowValue;
		break;
	case IDC_POWER:
		result = m_LastValue;
		for(i=1;i<=(long)NowValue-1;i++)
			result = result*m_LastValue;
		break;
	case IDC_EVOLUTION:
		result = GetEvolution(m_LastValue,NowValue);
		break;
	case IDC_DIVIDE:
		result = m_LastValue / NowValue;
		break;
	case IDC_MUTIPLY:
		result = m_LastValue * NowValue;
		break;
	case IDC_REDUCE:
		result = m_LastValue - NowValue;
		break;
	case IDC_ADD:
		result = m_LastValue + NowValue;
		break;
	case IDC_EQUAL:
		result = m_LastValue = NowValue;
		break;
	}
	return result;
}

long double CCalculatorDlg::GetEvolution(const long double &value1,
		                                 const long double &value2) const
{
    long double tempResult,smallone,bigone,temp;
    
	if ( 1 == value1 ) return 1;
    if ( value1 > 1 )
	{
		smallone = 1;
		bigone   = value1;
		temp  = ( smallone + bigone ) / 2;
		
	    do
		{
			tempResult = temp;
	        for (int i =1;i<=value2-1;i++)
	             tempResult *= temp;
	        if ( tempResult - value1 > 0.00000001 )
			     bigone = temp;
			else {if ( tempResult - value1 < -0.00000001 )
			          smallone = temp;
		       	  else return temp;}
			temp = ( bigone + smallone ) / 2;
		}while(1);
	}

	smallone = 0;
	bigone   = 1;
	temp  = ( smallone + bigone ) / 2;
	
	do
	{
		tempResult = temp;
		for( int i=1;i<=value2-1;i++)
		      tempResult *= temp;
		if ( tempResult - value1 > 0.00000001 )
			 bigone = temp;
        else if ( tempResult - value1 < -0.00000001 )
		     smallone = temp; 
		else return temp;
		temp = ( bigone + smallone ) / 2;
	}while(1);
}

void CCalculatorDlg::OnPower() 
{
	// TODO: Add your control notification handler code here
	UpdateData();

	m_LastValue = compute(m_NowValue);
	m_NowValue  = ldtoa(m_LastValue); 
	UpdateData(FALSE);
	m_ButtonID = IDC_POWER;
	m_LastButtonID = IDC_POWER;
}

void CCalculatorDlg::OnAdd() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	m_LastValue = compute(m_NowValue);
	m_NowValue  = ldtoa(m_LastValue); 
	UpdateData(FALSE);
	m_ButtonID = IDC_ADD;
	m_LastButtonID = IDC_ADD;
}

void CCalculatorDlg::OnReduce() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	m_LastValue = compute(m_NowValue);
	m_NowValue  = ldtoa(m_LastValue); 
	UpdateData(FALSE);
	m_ButtonID = IDC_REDUCE;
	m_LastButtonID = IDC_REDUCE;
}

void CCalculatorDlg::OnMutiply() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	m_LastValue = compute(m_NowValue);
	m_NowValue  = ldtoa(m_LastValue); 
	UpdateData(FALSE);
	m_ButtonID = IDC_MUTIPLY;
	m_LastButtonID = IDC_MUTIPLY;
}

void CCalculatorDlg::OnDivide() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	m_LastValue = compute(m_NowValue);
	m_NowValue  = ldtoa(m_LastValue); 
	UpdateData(FALSE);
	m_ButtonID = IDC_DIVIDE;
	m_LastButtonID = IDC_DIVIDE;
}

void CCalculatorDlg::OnEqual() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	m_LastValue = compute(m_NowValue);
	m_NowValue  = ldtoa(m_LastValue); 
	UpdateData(FALSE);
	m_ButtonID = IDC_EQUAL;
	m_LastButtonID = IDC_EQUAL;
}

void CCalculatorDlg::OnEvolution() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	m_LastValue = compute(m_NowValue);
	m_NowValue  = ldtoa(m_LastValue); 
	UpdateData(FALSE);
	m_ButtonID = IDC_EVOLUTION;
	m_LastButtonID = IDC_EVOLUTION;
}