// jisuanpiDlg.cpp : implementation file
//

#include "stdafx.h"
#include "jisuanpi.h"
#include "jisuanpiDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CJisuanpiDlg dialog

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

void CJisuanpiDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CJisuanpiDlg)
	DDX_Text(pDX, IDC_EDIT1, m_jd);
	DDX_Text(pDX, IDC_EDIT2, m_value);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CJisuanpiDlg, CDialog)
	//{{AFX_MSG_MAP(CJisuanpiDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CJisuanpiDlg message handlers

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

void CJisuanpiDlg::OnButton1() 
{   //pi=2 + 2/3 + 2/3*2/5 + 2/3*2/5*3/7 + ... 
    UpdateData();
	int ARRSIZE=m_jd+10, DISPCNT=m_jd+2; //定義數組大小，顯示位數
    char *x=new char[ARRSIZE], *z=new char[ARRSIZE]; //x[0] x[1] . x[2] x[3] x[4] .... x[ARRSIZE-1]
    int a=1, b=3, c, d, Run=1, Cnt=0;

  memset(x,0,ARRSIZE);
  memset(z,0,ARRSIZE);

  x[1] = 2;
  z[1] = 2;

  while(Run && (++Cnt<20000000))
  {
    //z*=a;
    d = 0;
    for(int i=ARRSIZE-1; i>0; i--)
    {
      c = z[i]*a + d;
      z[i] = c % 10;
      d = c / 10;
    }
    //z/=b;
    d = 0;
    for(i=0; i<ARRSIZE; i++)
    {
      c = z[i]+d*10;
      z[i] = c / b;
      d = c % b;
    }
    //x+=z;
    Run = 0;
    for(i=ARRSIZE-1; i>0; i--)
    {
      c = x[i] + z[i];
      x[i] = c%10;
      x[i-1] += c/10;
      Run |= z[i];
    }
    a++;
    b+=2;
  }

    CString ts;
	ts.Format("%d",x[1]);
	m_value=ts+".";
	
	for(int i=2;i<DISPCNT;i++)
	{
        ts.Format("%d",x[i]);
		if(i%50==0)
			m_value=m_value+"\n";
	    m_value=m_value + ts;
	
	}
	UpdateData(false);
}