b05031126dlg.cpp

本程序是一个完整的后缀表达式计算

/*
 * 学    号：B05031126
 *
 * 作    者：南京邮电大学计算机学院 吴登荣
 *
 * 摘    要：本程序是一个完整的后缀表达式计算，主要用栈的操作实现，本程序封装了CStack类实现
 *           栈的操作，本程序最大的特色在乎运用实时监控的算法对表达式进行数据校验，对一切合
 *           法的表达式进行计算，检验出所有任何非法表达式并提示。
 *
 * 完成日期：2006年9月25日
 *
 * E - mail：[e-mail]
*/
// B05031126Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "B05031126.h"
#include "B05031126Dlg.h"
#include "Stack.h"
#include "Function.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()

/////////////////////////////////////////////////////////////////////////////
// CB05031126Dlg dialog

CB05031126Dlg::CB05031126Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CB05031126Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CB05031126Dlg)
	m_expression = _T("");
	m_result = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CB05031126Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CB05031126Dlg)
	DDX_Text(pDX, IDC_EXPRESSION, m_expression);
	DDX_Text(pDX, IDC_RESULT, m_result);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CB05031126Dlg, CDialog)
	//{{AFX_MSG_MAP(CB05031126Dlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDCALCULATE, OnCalculate)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CB05031126Dlg message handlers

BOOL CB05031126Dlg::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 CB05031126Dlg::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 CB05031126Dlg::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 CB05031126Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CB05031126Dlg::OnCalculate() 
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	m_expression.TrimLeft();
	m_expression.TrimRight();
	m_expression=trimblank(m_expression);
	CStack s;
	int i=0;
	int j,k;
	int ntemp;//临时操作数
	int ntemp1;//临时操作数
	int ntemp2;//临时操作数
	int result;//运算结果
	//int opNum=getop(m_expression);
	if(check(m_expression)==1)//检验非法字符
	{
		while((i<m_expression.GetLength())&&(s.getflag()!=0))
		{
			if((m_expression[i]=='+')||(m_expression[i]=='-')||(m_expression[i]=='*')||(m_expression[i]=='/'))
			{
				if(m_expression[i]=='+')//完成加法运算
				{
					ntemp1=s.Top();
					s.Pop();
					ntemp2=s.Top();
					s.Pop();
					ntemp=ntemp1+ntemp2;
					s.Push(ntemp);
				}

				if(m_expression[i]=='-')//完成减法运算
				{
					ntemp1=s.Top();
					s.Pop();
					ntemp2=s.Top();	
					s.Pop();
					ntemp=ntemp2-ntemp1;
					s.Push(ntemp);
				}

				if(m_expression[i]=='*')//完成乘法运算
				{
					ntemp1=s.Top();
					s.Pop();
					ntemp2=s.Top();
					s.Pop();
					ntemp=ntemp1*ntemp2;
					s.Push(ntemp);
				}
	
				if(m_expression[i]=='/')//完成除法运算
				{
					ntemp1=s.Top();	
					s.Pop();
					ntemp2=s.Top();
					s.Pop();
					if(ntemp1!=0)
					{
						ntemp=ntemp2/ntemp1;
						s.Push(ntemp);
					}
					else
					{
						s.setflag(0);
					}
				}

				k=k+2;
			}
			else
			{
				ntemp=m_expression[i]-48;
				k=i+1;
				while((k<m_expression.GetLength())&&(m_expression[k]!=' ')&&(m_expression[k]!='+')&&(m_expression[k]!='-')&&(m_expression[k]!='*')&&(m_expression[k]!='/'))
				{
					k++;
				}
				for(j=i+1;j<k;j++)
					ntemp=ntemp*10+(m_expression[j]-'0');//讲表达式中的数字字符转换为整型
				s.Push(ntemp);
			}

			i=k+1;
		}
		
		if((s.getflag()!=0)&&(s.getcount()-getop(m_expression)==1)&&(s.getsum()==1))
		{
			result=s.Top();
			m_result.Format("%d",result);
			UpdateData(FALSE);
		}
		else
		{
			MessageBox("表达式错误！请重新输入！");
		}
	}
	else
	{
		MessageBox("表达式错误！请重新输入！");
	}
}