VC实现计算器
第一次完成VC下的小项目,略有所得,分享分享:
在完成项目之前首先得有个程序的流程图,即程序的实现过程。这个非常的重要,没有一个设计好的流程图,在编码的时候,会发现寸步难行,因为你跟不不知道如何下手,从何处下手,连下手的地方都没有,那么难度可想而知。尽管写了较为详细的流程图,博主在编码过程中还是出现了许多没有考虑进去的问题。具体的思路如下:
第一. 计算器开始步骤,要么进行输入显示,要么进行按键操作,基于此可以就这两方面展开进行分析。
第二.要开始输入,那么输入完成后,就要进行按键操作,按键操作分为4种基本的运算符加上%,AC(归零),.(小数点)和=4种。
输入数字后,进行加减乘除运算,那么需要将输入的数字进行保存,需要定义一个保存第一次输入数字的变量,当选择某一运算符号后,再进行输入,就需要保存第二次输入的变量。以此,当第二次进行运算符点击时,就应该显示两次的计算后的结果,并将这一结果作为第一次的输入,重复以上步骤。
若选择+/-符号,则在输入的数字前面加上+/-符号。
若选择.则在小数点后面加入数字。
若选择AC,将显示0。
若选择%,则将显示的数字除以100。
若选择=,将运算结果显示出来。
总的来说,就是点击界面上的按钮,根据按钮的不同,选择不同的算法。
具体的代码如下:
`` // CCounterDlg.cpp : implementation file
//
#include "stdafx.h"
#include "CCounter.h"
#include "CCounterDlg.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()
/////////////////////////////////////////////////////////////////////////////
// CCCounterDlg dialog
CCCounterDlg::CCCounterDlg(CWnd* pParent /*=NULL*/)
: CDialog(CCCounterDlg::IDD, pParent)
{
//{
{AFX_DATA_INIT(CCCounterDlg)
m_edit_show = _T("0");
m_ICount=1;
/*nSave=(int*)malloc(sizeof(int));*/
nSave=new long int;
dSave=new long double;
m_strShow="";
m_nResult=0;
m_Cal.IsFlag=FALSE;
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CCCounterDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{
{AFX_DATA_MAP(CCCounterDlg)
DDX_Text(pDX, IDC_EDIT_SHOW, m_edit_show);
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CCCounterDlg, CDialog)
//{
{AFX_MSG_MAP(CCCounterDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BUTTON_CLEAR, OnClear)
ON_BN_CLICKED(IDC_BUTTON_EQUAL, OnEqual)
ON_BN_CLICKED(IDC_BUTTON9, OnButton9)
ON_BN_CLICKED(IDC_BUTTON8, OnButton8)
ON_BN_CLICKED(IDC_BUTTON7, OnButton7)
ON_BN_CLICKED(IDC_BUTTON4, OnButton4)
ON_BN_CLICKED(IDC_BUTTON5, OnButton5)
ON_BN_CLICKED(IDC_BUTTON6, OnButton6)
ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
ON_BN_CLICKED(IDC_BUTTON3, OnButton3)
ON_BN_CLICKED(IDC_BUTTON0, OnButton0)
ON_BN_CLICKED(IDC_BUTTON_POINT, OnButtonPoint)
ON_BN_CLICKED(IDC_BUTTON_SYMBOL, OnButtonSymbol)
ON_BN_CLICKED(IDC_BUTTON_DIVISE, OnButtonDivise)
ON_BN_CLICKED(IDC_BUTTON_MULTIPLY, OnButtonMultiply)
ON_BN_CLICKED(IDC_BUTTON_ADD, OnButtonAdd)
ON_BN_CLICKED(IDC_BUTTON_SUBTRACT, OnButtonSubtract)
ON_BN_CLICKED(IDC_BUTTON_DIVISEALL, OnButtonDiviseall)
ON_WM_DESTROY()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CCCounterDlg message handlers
BOOL CCCounterDlg::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 CCCounterDlg::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 CCCounterDlg::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 CCCounterDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
void CCCounterDlg::OnClear()
{
// TODO: Add your control notification handler code here
GetDlgItem(IDC_EDIT_SHOW)->SetWindowText("0");
m_Cal.nEvent=N_ZERO;
m_Cal.IsFlag=FALSE;
}
void CCCounterDlg::OnEqual()
{
// TODO: Add your control notification handler code here
CString strEql;
double dResult;
GetDlgItem(IDC_EDIT_SHOW)->GetWindowText(strEql);
m_nResult=atoi(strEql);
dResult=atof(strEql);
if(strEql.Find(".") != -1)
{
switch(m_Cal.nEvent)
{
case N_ZERO:
dSave[0]=dResult;
break;
case N_ADD:
if(!m_Cal.IsDouble)
{
dResult=nSave[0]+dResult;
m_strShow.Format("%.2f",dResult);
}
else
{
dResult=dSave[0]+dResult;
m_strShow.Format("%.2f",dResult);