mycalcdlg.cpp

一个比较简单的计算器,基本完成了实数的加减乘除的功能,还有取负号,开方,倒数,清除等功能.

// MyCalcDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MyCalc.h"
#include "MyCalcDlg.h"
#include "math.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()

/////////////////////////////////////////////////////////////////////////////
// CMyCalcDlg dialog

CMyCalcDlg::CMyCalcDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMyCalcDlg::IDD, pParent)
{	
	m_first = 0.0;
	m_second = 0.0;
	m_operator = "0.0";
	m_coff = 1.0;
	//{{AFX_DATA_INIT(CMyCalcDlg)
	m_display = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMyCalcDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMyCalcDlg)
	DDX_Text(pDX, IDC_DISPLAY, m_display);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMyCalcDlg, CDialog)
	//{{AFX_MSG_MAP(CMyCalcDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON0, OnButton0)
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	ON_BN_CLICKED(IDC_BUTTON3, OnButton3)
	ON_BN_CLICKED(IDC_BUTTON4, OnButton4)
	ON_BN_CLICKED(IDC_BUTTON5, OnButton5)
	ON_BN_CLICKED(IDC_BUTTON6, OnButton6)
	ON_BN_CLICKED(IDC_BUTTON7, OnButton7)
	ON_BN_CLICKED(IDC_BUTTON8, OnButton8)
	ON_BN_CLICKED(IDC_BUTTON9, OnButton9)
	ON_BN_CLICKED(IDC_BUTTON_CLEAR, OnButtonClear)
	ON_BN_CLICKED(IDC_BUTTON_ADD, OnButtonAdd)
	ON_BN_CLICKED(IDC_BUTTON_EQUAL, OnButtonEqual)
	ON_BN_CLICKED(IDC_BUTTON_MINUS, OnButtonMinus)
	ON_BN_CLICKED(IDC_BUTTON_MUTIPLY, OnButtonMutiply)
	ON_BN_CLICKED(IDC_BUTTON_DIV, OnButtonDiv)
	ON_BN_CLICKED(IDC_BUTTON_SQRT, OnButtonSqrt)
	ON_BN_CLICKED(IDC_BUTTON_RECIPROCAL, OnButtonReciprocal)
	ON_BN_CLICKED(IDC_BUTTON_POINT, OnButtonPoint)
	ON_BN_CLICKED(IDC_BUTTON_SIGN, OnButtonSign)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyCalcDlg message handlers

BOOL CMyCalcDlg::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 CMyCalcDlg::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 CMyCalcDlg::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 CMyCalcDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CMyCalcDlg::OnButton0() 
{	
	SetDisplay(0);
	//m_display.Format("%d",0);
	//UpdateData(false);
}

void CMyCalcDlg::OnButton1() 
{
	SetDisplay(1);
}

void CMyCalcDlg::OnButton2() 
{
	SetDisplay(2);	
}

void CMyCalcDlg::OnButton3() 
{
	SetDisplay(3);
}

void CMyCalcDlg::OnButton4() 
{
	SetDisplay(4);
}

void CMyCalcDlg::OnButton5() 
{
	SetDisplay(5);
}

void CMyCalcDlg::OnButton6() 
{
	SetDisplay(6);
}

void CMyCalcDlg::OnButton7() 
{
	SetDisplay(7);
}

void CMyCalcDlg::OnButton8() 
{
	SetDisplay(8);
}

void CMyCalcDlg::OnButton9() 
{
	SetDisplay(9);
}

void CMyCalcDlg::SetDisplay(double i)
{	
	if( m_coff == 1.0 ) 
	{
		m_first = m_first*10+i;
	}
	else 
	{
		m_first = m_first + m_coff*i;
		m_coff *= 0.1;
	}
	m_display.Format("%f",m_first);
	for(int l = m_display.GetLength();m_display.GetAt(l-1) != '.' && m_display.GetAt(l-1) == '0';l--)
	{
		m_display.Delete(l-1);
	}
	UpdateData(false);
}

void CMyCalcDlg::OnButtonClear() 
{
	//全部清空
	m_first = 0.0;
	m_second = 0.0;
	m_coff = 1.0;
	m_display.Format("%f",m_first);
	for(int l = m_display.GetLength();m_display.GetAt(l-1) != '.' && m_display.GetAt(l-1) == '0';l--)
	{
		m_display.Delete(l-1);
	}
	UpdateData(false);
	//逐个删除
	//m_display = m_display.Left(m_display.GetLength()-1);
	//UpdateData(false);
}

void CMyCalcDlg::OnButtonEqual() 
{
	Calculate();
	m_first = 0.0;
	m_operator = "+";
}

void CMyCalcDlg::OnButtonAdd() 
{
	m_second = m_first;
	m_first = 0.0;
	m_coff = 1.0;
	m_operator = "+";
	
}

void CMyCalcDlg::OnButtonMinus() 
{
	m_second = m_first;
	m_first = 0.0;
	m_coff = 1.0;
	m_operator = "-";
}

void CMyCalcDlg::OnButtonMutiply() 
{
	m_second = m_first;
	m_first = 0.0;
	m_coff = 1.0;
	m_operator = "*";
}

void CMyCalcDlg::OnButtonDiv() 
{
	m_second = m_first;
	m_first = 0.0;
	m_coff = 1.0;
	m_operator = "/";
}

void CMyCalcDlg::Calculate()
{
	switch(m_operator.GetAt(0))
	{
	case '+':
		m_second += m_first;
		break;
	case '-':
		m_second -= m_first;
		break;
	case '*':
		m_second *= m_first;
		break;
	case '/':
		if( fabs( m_first ) <= 0.000001)
		{
			m_display = "除数不能为零";
			m_second = 0.0;
			UpdateData(false);
			return;
		}
		m_second /= m_first;
		break;
	}
	m_first = 0.0;
	m_coff = 1.0;
	SetDisplay(m_second);
}

void CMyCalcDlg::OnButtonSqrt() 
{
	m_first = sqrt( m_first );
	m_display.Format("%f",m_first);
	//删除m_display后面的0
	for(int l = m_display.GetLength();m_display.GetAt(l-1)!='.' && m_display.GetAt(l-1)=='0';l--)
	{
		m_display.Delete(l-1);
	}
	UpdateData(false);
}

void CMyCalcDlg::OnButtonReciprocal() 
{
	if( fabs( m_first ) <= 0.000001)
		{
			m_display = "除数不能为零";
			UpdateData(false);
			return;
		}
	m_first = 1.0/m_first;
	m_display.Format("%f",m_first);
	//删除m_display后面的0
	for(int l = m_display.GetLength();m_display.GetAt(l-1)!='.' && m_display.GetAt(l-1)=='0';l--)
	{
		m_display.Delete(l-1);
	}
	UpdateData(false);		
}

void CMyCalcDlg::OnButtonPoint() 
{
	m_coff = 0.1;	
}

void CMyCalcDlg::OnButtonSign() 
{
	m_first = -m_first;
}