calcdlgn.txt

输入含数字的式子（可以用多层括号嵌套）

// CalcDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Calc.h"
#include "CalcDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#include<math.h>
/////////////////////////////////////////////////////////////////////////////
// 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()

/////////////////////////////////////////////////////////////////////////////
// CCalcDlg dialog

CCalcDlg::CCalcDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CCalcDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CCalcDlg)
	m_str = _T("");
	m_answer = _T("");
	m_mode = -1;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CCalcDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CCalcDlg)
	DDX_Text(pDX, IDC_EDIT_STR, m_str);
	DDX_Text(pDX, IDC_EDIT_ANSWER, m_answer);
	DDX_Radio(pDX, IDC_RADIO_INT, m_mode);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CCalcDlg, CDialog)
	//{{AFX_MSG_MAP(CCalcDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON_CALC, OnButtonCalc)
	ON_BN_CLICKED(IDC_BUTTON_EXIT, OnButtonExit)
	ON_EN_CHANGE(IDC_EDIT_STR, OnChangeEditStr)
	ON_BN_CLICKED(IDC_RADIO_INT, OnRadioInt)
	ON_BN_CLICKED(IDC_RADIO_FLOAT, OnRadioFloat)
	ON_EN_CHANGE(IDC_EDIT_ANSWER, OnChangeEditAnswer)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCalcDlg message handlers

BOOL CCalcDlg::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
//	m_str="4+(5+6)+(6+5)*(4*(8+9)-4*8)+8*(9-7)-7";
//	m_str="4*5";
	m_mode=0;
	UpdateData(0);
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

void CCalcDlg::OnButtonCalc() 
{
	CWaitCursor m_waitcursor;
	BOOL flag=0;int left=0,right=0;
	for(int i=0;i<m_str.GetLength();i++)
	{
		if(m_str.GetAt(i)=='+'||m_str.GetAt(i)=='-'||m_str.GetAt(i)=='*'||m_str.GetAt(i)=='/')
			if(m_str.GetAt(i+1)=='*'||m_str.GetAt(i+1)=='/')
				flag=1;
		if(m_str.GetAt(i)=='*'||m_str.GetAt(i)=='/')
			if(m_str.GetAt(i+1)=='+'||m_str.GetAt(i+1)=='-')
				flag=1;
		if(m_str.GetAt(i)=='(')left++;
		if(m_str.GetAt(i)==')')right++;
	}
	if(left!=right)flag=1;
	if(left>9||right>9)
	{
		flag=1;
		MessageBox("输入的计算式括号不可超过9个！","抱歉",MB_OK|MB_ICONERROR);
	}
	if(flag==0)
	{
		if(m_mode==0)
		{
			if(m_str.Find('.',0)==-1)
			{
				if(m_str.GetLength())
				m_answer=GetInt(m_str);
			}
			else
			{
				m_mode=1;
				UpdateData(0);
				OnButtonCalc();
			}
		}
		else
		{
			if(m_str.GetLength())
			m_answer=GetFloat(m_str);
		}
//			MessageBox("暂不能实现浮点运算，对不起！","抱歉",MB_OK|MB_ICONASTERISK);
	}
	else
		MessageBox("输入的计算式有语法错误！","错误",MB_OK|MB_ICONERROR);
	UpdateData(0);
}

void CCalcDlg::OnButtonExit() 
{
	// TODO: Add your control notification handler code here
	OnOK();	
}

void CCalcDlg::OnChangeEditStr() 
{
	UpdateData(1);	
}

void CCalcDlg::OnRadioInt() 
{
	UpdateData(1);	
}

void CCalcDlg::OnRadioFloat() 
{
	UpdateData(1);	
}

CString CCalcDlg::GetFloat(CString str)
{
	int count[10][2];for(int i=0;i<10;i++){count[i][0]=-1;count[i][1]=-1;}
	/////以上初始化数组count，使之全为-1
	int cou=0;//用于填充数组count的第一维
	int sgn=0;//用于记录无用的“(”和“)”，遇“(”加1,遇“)”减1。
	for(i=str.GetLength()-1;i>=0;i--)
	{
		if(str.GetAt(i)==41)
		{
			if(sgn==0)
				count[cou][0]=i;
			sgn++;
		}
		if(str.GetAt(i)==40)
		{
			if(sgn==1)
			{
				count[cou][1]=i;
				cou++;
			}
			sgn--;
		}
	}
	if(cou)
	{
		int kuo=0;CString kuostr,kuoanswer;
		for(kuo=0;kuo<cou;kuo++)
		{
			kuostr=str.Mid(count[kuo][1]+1,count[kuo][0]-count[kuo][1]-1);
//			MessageBox(kuostr);
			kuoanswer=GetFloat(kuostr);
			str.Delete(count[kuo][1],count[kuo][0]-count[kuo][1]+1);
			str.Insert(count[kuo][1],kuoanswer);
			return GetFloat(str);
		}
	}
		//以上得到m_str是几个(...)组成的
	if(str.GetAt(0)=='+')str.Delete(0);
	if(str.Mid(1).SpanIncluding("0123456789.").GetLength()==str.Mid(1).GetLength())
		return str;

	CString s;s=str;
		for(i=0;i<str.GetLength();i++)//负负得正；“--”号变“+”。
		{
			if(str.GetAt(i)=='-'&&i!=0&&str.GetAt(i+1)=='-')
			{
				str.Delete(i,2);
				str.Insert(i,'+');
			}
		}
		s=str;
		for(i=0;i<str.GetLength();i++)//减法变加法；“-”号变“+-”。
		{
			if(str.GetAt(i)=='-'&&i!=0&&str.GetAt(i-1)!='+'&&str.GetAt(i-1)!='*'&&str.GetAt(i-1)!='/')
				str.Insert(i,'+');
		}
		s=str;
		for(i=0;i<str.GetLength();i++)//去掉多余加号
		{
			if(str.GetAt(i)=='+'&&str.GetAt(i+1)=='+')
			{s.Delete(i);}
		}
		str=s;
//		MessageBox(s);
	if(cou==0)//式中没有括号
	{float cheng=0;int chengdown=0,chengup=0;