计算器的代码,高手帮忙解释一下
// calculatorDlg.cpp : implementation file//
#include "stdafx.h"
#include "calculator.h"
#include "calculatorDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
double sum1,sum2,sum3;
double point=0;
double tmpdata;
CString signal="@";
CString signal2="@";
CString signal3="@";
CString signal4="@";//用于CE键
int datesize;//数位计
/////////////////////////////////////////////////////////////////////////////
// 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()
/////////////////////////////////////////////////////////////////////////////
// CCalculatorDlg dialog
CCalculatorDlg::CCalculatorDlg(CWnd* pParent /*=NULL*/)
: CDialog(CCalculatorDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CCalculatorDlg)
m_edit = 0;
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CCalculatorDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CCalculatorDlg)
DDX_Text(pDX, IDC_EDIT1, m_edit);
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CCalculatorDlg, CDialog)
//{{AFX_MSG_MAP(CCalculatorDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_0, On0)
ON_BN_CLICKED(IDC_SIGN, OnSign)
ON_BN_CLICKED(IDC_POINT, OnPoint)
ON_BN_CLICKED(IDC_ADD, OnAdd)
ON_BN_CLICKED(IDC_EQUAL, OnEqual)
ON_BN_CLICKED(IDC_1, On1)
ON_BN_CLICKED(IDC_2, On2)
ON_BN_CLICKED(IDC_3, On3)
ON_BN_CLICKED(IDC_REDUCE, OnReduce)
ON_BN_CLICKED(IDC_DAOSHU, OnDaoshu)
ON_BN_CLICKED(IDC_4, On4)
ON_BN_CLICKED(IDC_5, On5)
ON_BN_CLICKED(IDC_6, On6)
ON_BN_CLICKED(IDC_CHEN, OnChen)
ON_BN_CLICKED(IDC_PERCENT, OnPercent)
ON_BN_CLICKED(IDC_7, On7)
ON_BN_CLICKED(IDC_8, On8)
ON_BN_CLICKED(IDC_9, On9)
ON_BN_CLICKED(IDC_DIVIDE, OnDivide)
ON_BN_CLICKED(IDC_SQRT, OnSqrt)
ON_BN_CLICKED(IDC_BACK, OnBack)
ON_BN_CLICKED(IDC_CE, OnCe)
ON_BN_CLICKED(IDC_C, OnC)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CCalculatorDlg message handlers
BOOL CCalculatorDlg::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_1.AutoLoad(IDC_1,this);
m_2.AutoLoad(IDC_2,this);
m_3.AutoLoad(IDC_3,this);
m_4.AutoLoad(IDC_4,this);
m_5.AutoLoad(IDC_5,this);
m_6.AutoLoad(IDC_6,this);
m_7.AutoLoad(IDC_7,this);
m_8.AutoLoad(IDC_8,this);
m_9.AutoLoad(IDC_9,this);
m_0.AutoLoad(IDC_0,this);
m_back.AutoLoad(IDC_BACK,this);
m_ce.AutoLoad(IDC_CE,this);
m_c.AutoLoad(IDC_C,this);
m_divide.AutoLoad(IDC_DIVIDE,this);
m_sqrt.AutoLoad(IDC_SQRT,this);
m_chen.AutoLoad(IDC_CHEN,this);
m_percent.AutoLoad(IDC_PERCENT,this);
m_reduce.AutoLoad(IDC_REDUCE,this);
m_daoshu.AutoLoad(IDC_DAOSHU,this);
m_sign.AutoLoad(IDC_SIGN,this);
m_add.AutoLoad(IDC_ADD,this);
m_equal.AutoLoad(IDC_EQUAL,this);
m_point.AutoLoad(IDC_POINT,this);
return TRUE; // return TRUE unless you set the focus to a control
}
void CCalculatorDlg::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 CCalculatorDlg::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 CCalculatorDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
void CCalculatorDlg::On0()
{
// TODO: Add your control notification handler code here
KeyDeal(0);
}
void CCalculatorDlg::OnSign()
{
// TODO: Add your control notification handler code here
m_edit=0-m_edit;
UpdateData(0);
}
void CCalculatorDlg::OnPoint()
{
// TODO: Add your control notification handler code here
if(!point) //判断point是否已按下过
point=0.1;
}
void CCalculatorDlg::OnAdd()
{
// TODO: Add your control notification handler code here
DateSolve();
signal="+";
point=0;
m_edit=0;
datesize=0;
}
void CCalculatorDlg::OnEqual()
{
// TODO: Add your control notification handler code here
if(signal=="+"){
m_edit=sum1+m_edit;
sum1=0;
}
if(signal=="-"){
m_edit=sum1-m_edit;
sum1=0;
}
if(signal=="*"){
sum2=sum2*m_edit;
if(signal2=="+"){
m_edit=sum1+sum2;
UpdateData(0);
}
else if(signal2=="-"){
m_edit=sum1-sum2;
UpdateData(0);
}
else{
m_edit=sum2;
UpdateData(0);
}
}
if(signal=="/"){
if(m_edit==0){
AfxMessageBox("除数不能为零!");
}
else{
sum3=sum3/m_edit;
if(signal3=="+"){
m_edit=sum1=sum1+sum3;
UpdateData(0);
}
else if(signal3=="-"){
m_edit=sum1=sum1-sum3;
UpdateData(0);
}
else{
m_edit=sum3;
UpdateData(0);
}
}
}
Cleardate();
}
void CCalculatorDlg::On1()
{
// TODO: Add your control notification handler code here
KeyDeal(1);
}
void CCalculatorDlg::On2()
{
// TODO: Add your control notification handler code here
KeyDeal(2);
}
void CCalculatorDlg::On3()
{
// TODO: Add your control notification handler code here
KeyDeal(3);
}
void CCalculatorDlg::OnReduce()
{
// TODO: Add your control notification handler code here
DateSolve();
signal="-";
point=0;
m_edit=0;
datesize=0;
}
void CCalculatorDlg::OnDaoshu()
{
// TODO: Add your control notification handler code here
if(m_edit){
m_edit=1/m_edit;
UpdateData(0);
}
}
void CCalculatorDlg::On4()
{
// TODO: Add your control notification handler code here
KeyDeal(4);
}
void CCalculatorDlg::On5()
{
// TODO: Add your control notification handler code here
KeyDeal(5);
}
void CCalculatorDlg::On6()
{
// TODO: Add your control notification handler code here
KeyDeal(6);
}
void CCalculatorDlg::OnChen()
{
// TODO: Add your control notification handler code here
point=0;
signal4=signal;
if(signal=="@"||signal=="=")
sum2=m_edit;
if(signal=="+"||signal=="-"){
sum2=m_edit;
signal2=signal;
}
if(signal=="*"){
sum2=sum2*m_edit;
m_edit=sum2;
}
if(signal=="/"){
if(m_edit==0){
AfxMessageBox("除数不能为零!");
return;
}
sum2=sum3/m_edit;
m_edit=sum2;
}
signal="*";
UpdateData(0);
m_edit=0;
datesize=0;
}
void CCalculatorDlg::OnPercent()
{
// TODO: Add your control notification handler code here
m_edit=m_edit/100;
UpdateData(0);
}
void CCalculatorDlg::On7()
{
// TODO: Add your control notification handler code here
KeyDeal(7);
}
void CCalculatorDlg::On8()
{
// TODO: Add your control notification handler code here
KeyDeal(8);
}
void CCalculatorDlg::On9()
{
// TODO: Add your control notification handler code here
KeyDeal(9);
}
void CCalculatorDlg::OnDivide()
{
// TODO: Add your control notification handler code here
point=0;
signal4=signal;//
tmpdata=m_edit;//数据备份,为OnCe()作准备
if(signal=="@"||signal=="=")
sum3=m_edit;
if(signal=="+"||signal=="-"){
sum3=m_edit;
signal3=signal;
}
if(signal=="/"){
if(m_edit==0){
AfxMessageBox("除数不能为零!");
return;
}
sum3=sum3/m_edit;
m_edit=sum3;
}
if(signal=="*"){
sum3=sum2*m_edit;
m_edit=sum3;
}
signal="/";
UpdateData(0);
m_edit=0;
datesize=0;
}
void CCalculatorDlg::OnSqrt()
{
// TODO: Add your control notification handler code here
m_edit=m_edit*m_edit;
UpdateData(0);
}
void CCalculatorDlg::OnBack()
{
// TODO: Add your control notification handler code here
int i=(int)m_edit;
if(point==0)
m_edit=(double)(int)(m_edit/10);
else{
point=point*10;
m_edit=(double)((int)(m_edit*(0.1/point)))*(point*10);
if(i==m_edit)
point=0;
}
if(datesize)//判断数位是否已完全清除
datesize--;
UpdateData(0);
}
void CCalculatorDlg::OnCe()
{
// TODO: Add your control notification handler code here
signal="@";
if(signal4=="+"||signal4=="-")
m_edit=sum1;
else if(signal4=="*")
m_edit=sum2;
else if(signal4=="/")
m_edit=sum3;
point=0;
datesize=0;
UpdateData(0);
}
void CCalculatorDlg::OnC()
{
// TODO: Add your control notification handler code here
m_edit=0;
sum1=0;
sum2=0;
sum3=0;
tmpdata=0;
datesize=0;
point=0;
signal="@";
signal2="@";
signal3="@";
signal4="@";
UpdateData(0);
}
void CCalculatorDlg::Cleardate() //数据清零
{
signal="=";
point=0;
sum1=0;
sum2=0;
sum3=0;
tmpdata=0;
datesize=0;
signal2="@";
signal3="@";
signal4="@";
UpdateData(0);
}
void CCalculatorDlg::DateSolve() //处理加减法
{
signal4=signal; //}
tmpdata=m_edit; // }备份,为OnCe()作准备
if(signal=="+")
sum1=sum1+m_edit;
else if(signal=="-")
sum1=sum1-m_edit;
else if(signal=="*")
sum1=sum2=sum2*m_edit;
else if(signal=="/")
sum1=sum3=sum3/m_edit;
else
sum1=m_edit;
m_edit=sum1;
UpdateData(0);
}
void CCalculatorDlg::KeyDeal(int a) //处理数字按钮
{
if(datesize<9){
datesize++;
if(signal=="="){
m_edit=a;
signal="@";
UpdateData(0);
return;
}
if(point){
m_edit=m_edit+point*a;
point=point/10;
}
else
m_edit=m_edit*10+a;
UpdateData(0);
}
}
