loaddlg.cpp

一个利率计算问题

// LoadDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Load.h"
#include "LoadDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CLoadDlg dialog

CLoadDlg::CLoadDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CLoadDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CLoadDlg)
	m_bEquality = FALSE;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

	m_fAmount = 37*10000;//总额(元)
//	m_fAmount = 10*10000;//总额(元)
	m_nStartDate = 200404;//200401
//	m_nStartDate = 200310;//200401
	count = 0;
}

void CLoadDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CLoadDlg)
	DDX_Control(pDX, IDC_EDIT7, m_ctrlEdit7);
	DDX_Control(pDX, IDC_EDIT6, m_ctrlEdit6);
	DDX_Control(pDX, IDC_EDIT5, m_ctrlEdit5);
	DDX_Control(pDX, IDC_EDIT4, m_ctrlEdit4);
	DDX_Control(pDX, IDC_EDIT3, m_ctrlEdit3);
	DDX_Control(pDX, IDC_EDIT2, m_ctrlEdit2);
	DDX_Control(pDX, IDC_EDIT1, m_ctrlEdit1);
	DDX_Control(pDX, IDC_LIST1, m_ctrlTarget);
	DDX_Check(pDX, IDC_CHECK1, m_bEquality);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CLoadDlg, CDialog)
	//{{AFX_MSG_MAP(CLoadDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	ON_BN_CLICKED(IDC_BUTTON3, OnButton3)
	ON_BN_CLICKED(IDC_CHECK1, OnCheck1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CLoadDlg message handlers

BOOL CLoadDlg::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
///////////////////////////////////////////////////////////////
////Initialize_1
	m_ctrlTarget.InsertColumn(0,"开始日期",LVCFMT_RIGHT,60);
	m_ctrlTarget.InsertColumn(1,"当月日期",LVCFMT_RIGHT,60);
	m_ctrlTarget.InsertColumn(2,"本金(元)",LVCFMT_RIGHT,80);
	m_ctrlTarget.InsertColumn(3,"已还本金(元)",LVCFMT_RIGHT,100);
	m_ctrlTarget.InsertColumn(4,"总月数",LVCFMT_RIGHT,60);
	m_ctrlTarget.InsertColumn(5,"当月年利率(%)",LVCFMT_RIGHT,100);
	m_ctrlTarget.InsertColumn(6,"当月偿还(元)",LVCFMT_RIGHT,100);
	m_ctrlTarget.InsertColumn(7,"差额(元)",LVCFMT_RIGHT,60);
	m_ctrlTarget.InsertColumn(8,"次数",LVCFMT_RIGHT,50);

///////////////////////////////////////////////////////////////
////Initialize_2
	CString str = "";
	char* pFileName = "load.txt";
	CStdioFile f;
	if(f.Open(pFileName, CFile::modeRead|CFile::typeText)) 
	{
		while(f.ReadString(str))
		{
			Record r;
			StruStr(str, r, 2);
			m_arrRecords.Add(r);
		}
		f.Close();
	}
	else
	{
		#ifdef _DEBUG
			AfxMessageBox("Unable to open file");
		#endif	
	}

///////////////////////////////////////////////////////////////
////Initialize_3
	str.Format("%.2f", m_fAmount);
	m_ctrlEdit1.SetWindowText(str);

	str.Format("%d", m_nStartDate);
	m_ctrlEdit2.SetWindowText(str);

	if(m_arrRecords.GetSize() > 0)
	{
		m_fcurInterest = m_arrRecords[m_arrRecords.GetSize() - 1].interest;
	}
	else
	{
		m_fcurInterest = 5.04;
	}
	str.Format("%.2f", m_fcurInterest);
	m_ctrlEdit3.SetWindowText(str);	

///////////////////////////////////////////////////////////////
////Initialize_4
	m_ctrlEdit4.SetFocus();

//	return TRUE;  // return TRUE  unless you set the focus to a control
	return FALSE;
}

void CLoadDlg::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 CLoadDlg::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 CLoadDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

//n == 1, Stru -> Str; n == 2, Str -> Stru
void CLoadDlg::StruStr(CString& s, Record& r, int n)
{
	if(n == 1)
	{
		s.Format("%d, %d, %05.2f, %05.2f, %d, %05.2f, %05.2f\r\n", 
			r.startDate, r.currDate, r.corpus, r.passCorpus, r.tolalMonth, r.interest, r.pay);
	}
	else if(n == 2)
	{
		CString T;
		int n = 0;
		int m = 0;

		n = s.Find(",");
		T = s.Mid(0, n);
		r.startDate = atoi(T.GetBuffer(T.GetLength()));
		m = n+1;

		n = s.Find(",", m);
		T = s.Mid(m, n-m);
		r.currDate = atoi(T.GetBuffer(T.GetLength()));
		m = n+1;

		n = s.Find(",", m);
		T = s.Mid(m, n-m);
		r.corpus = atof(T.GetBuffer(T.GetLength()));
		m = n+1;

		n = s.Find(",", m);
		T = s.Mid(m, n-m);
		r.passCorpus = atof(T.GetBuffer(T.GetLength()));
		m = n+1;

		n = s.Find(",", m);
		T = s.Mid(m, n-m);
		r.tolalMonth= atoi(T.GetBuffer(T.GetLength()));
		m = n+1;

		n = s.Find(",", m);
		T = s.Mid(m, n-m);
		r.interest = atof(T.GetBuffer(T.GetLength()));
		m = n+1;

		n = s.Find(",", m);
		T = s.Mid(m, s.GetLength()-m);
		r.pay = atof(T.GetBuffer(T.GetLength()));
		m = n+1;
	}
	else
		AfxMessageBox("parameter error!");
}

#include <math.h>
//A -> 贷款总额，r －> 贷款年利率， N -> 贷款总年数， n -> 第n月，V -> 第n月偿还，a -> 已还本金
void CLoadDlg::Compute(double A, double r, int N, int n, double& V, double& a)
{
	if(m_bEquality)
	{
		if(pow(1+(r/12.0), N) != 1)
		{
			V = A*(r/12.0)*(1+1.0/(pow(1+(r/12.0), N)-1));
			a = A*(pow(1+(r/12.0), n)-1)/(pow(1+(r/12.0), N)-1);
		}
		else
			AfxMessageBox("parameter error!");
	}
	else
	{
		V = A*(1+(r/12.0)*(N-n+1))/N;

		if(n == 1)
			a = 0.0;