Visual C++ Dialog Based Application - Basic Calculator Application
I have come up with basic calculator application using Visual C++ - Dialog based application. Scroll down to see the download instructions and output.
Source Code
// SimpleCalcDlg.cpp : implementation file
//
#include "stdafx.h"
#include "SimpleCalc.h"
#include "SimpleCalcDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
enum Operation {
OpPlus = 1, OpMinus, OpMultiply, OpDivide,
};
// CAboutDlg dialog used for App About
class CAboutDlg : public CDialog
{
public:
CAboutDlg();
// Dialog Data
enum { IDD = IDD_ABOUTBOX };
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
// Implementation
protected:
DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()
// CSimpleCalcDlg dialog
CSimpleCalcDlg::CSimpleCalcDlg(CWnd* pParent /*=NULL*/)
: CDialog(CSimpleCalcDlg::IDD, pParent)
, m_opcount(0)
, m_expr(_T(""))
, m_fullexpr(_T(""))
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CSimpleCalcDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Control(pDX, IDC_EDIT2, m_editCtrl);
DDX_Text(pDX, IDC_EDIT2, m_expr);
DDX_Text(pDX, IDC_EDIT3, m_fullexpr);
}
BEGIN_MESSAGE_MAP(CSimpleCalcDlg, CDialog)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
ON_BN_CLICKED(IDOK, &CSimpleCalcDlg::OnBnClickedOk)
ON_BN_CLICKED(IDCANCEL, &CSimpleCalcDlg::OnBnClickedCancel)
ON_BN_CLICKED(ID_ZERO, &CSimpleCalcDlg::OnBnClickedZero)
ON_BN_CLICKED(ID_ONE, &CSimpleCalcDlg::OnBnClickedOne)
ON_BN_CLICKED(ID_TWO, &CSimpleCalcDlg::OnBnClickedTwo)
ON_BN_CLICKED(ID_THREE, &CSimpleCalcDlg::OnBnClickedThree)
ON_BN_CLICKED(ID_FOUR, &CSimpleCalcDlg::OnBnClickedFour)
ON_BN_CLICKED(ID_FIVE, &CSimpleCalcDlg::OnBnClickedFive)
ON_BN_CLICKED(ID_SIX, &CSimpleCalcDlg::OnBnClickedSix)
ON_BN_CLICKED(ID_SEVEN, &CSimpleCalcDlg::OnBnClickedSeven)
ON_BN_CLICKED(ID_EIGHT, &CSimpleCalcDlg::OnBnClickedEight)
ON_BN_CLICKED(ID_NINE, &CSimpleCalcDlg::OnBnClickedNine)
ON_BN_CLICKED(ID_DOT, &CSimpleCalcDlg::OnBnClickedDot)
ON_EN_SETFOCUS(IDC_EDIT2, &CSimpleCalcDlg::OnEnSetfocusEdit2)
ON_EN_CHANGE(IDC_EDIT2, &CSimpleCalcDlg::OnEnChangeEdit2)
ON_EN_KILLFOCUS(IDC_EDIT2, &CSimpleCalcDlg::OnEnKillfocusEdit2)
ON_BN_CLICKED(ID_PLUS, &CSimpleCalcDlg::OnBnClickedPlus)
ON_BN_CLICKED(ID_MINUS, &CSimpleCalcDlg::OnBnClickedMinus)
ON_BN_CLICKED(ID_MUL, &CSimpleCalcDlg::OnBnClickedMul)
ON_BN_CLICKED(ID_DIV, &CSimpleCalcDlg::OnBnClickedDiv)
ON_BN_CLICKED(ID_C, &CSimpleCalcDlg::OnBnClickedC)
ON_BN_CLICKED(ID_PLUS_MINUS, &CSimpleCalcDlg::OnBnClickedPlusMinus)
ON_BN_CLICKED(IDSWF, &CSimpleCalcDlg::OnBnClickedSwf)
END_MESSAGE_MAP()
// CSimpleCalcDlg message handlers
BOOL CSimpleCalcDlg::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
m_editCtrl.EnableWindow();
m_flush = false;
m_fullflush = false;
return TRUE; // return TRUE unless you set the focus to a control
}
void CSimpleCalcDlg::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 CSimpleCalcDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting
SendMessage(WM_ICONERASEBKGND, reinterpret_cast<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 function to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CSimpleCalcDlg::OnQueryDragIcon()
{
return static_cast<HCURSOR>(m_hIcon);
}
int CSimpleCalcDlg::Compute(int arg)
{
UpdateData(TRUE);
if(m_expr.GetLength() == 0)
return -1;
m_num2 = atof(m_expr);
if(m_num2 == 0)
m_fullexpr += "0";
else
m_fullexpr += m_expr;
UpdateData(FALSE);
UpdateData(TRUE);
if(m_opcode == OpPlus)
{
m_result = m_num1 + m_num2;
}
else if(m_opcode == OpMinus)
{
m_result = m_num1 - m_num2;
}
else if(m_opcode == OpMultiply)
{
m_result = m_num1 * m_num2;
}
else if(m_opcode == OpDivide)
{
m_result = m_num1 / m_num2;
}
m_num1 = m_result;
m_num2 = 0;
m_opcount = 1;
char buf[128];
sprintf(buf, "%lf", m_result);
m_expr = buf;
m_flush = true;
if(m_fullflush == true)
{
m_fullexpr += "=";
m_fullexpr += m_expr;
m_num1 = m_num2 = m_result = 0;
m_opcode = m_opcount = 0;
}
UpdateData(FALSE);
return 0;
}
void CSimpleCalcDlg::OnBnClickedOk()
{
if(m_opcount == 0)
return;
m_fullflush = true;
Compute(1);
}
void CSimpleCalcDlg::OnBnClickedCancel()
{
OnCancel();
}
void CSimpleCalcDlg::AddString(const CString &str)
{
UpdateData(TRUE);
if(m_fullflush == true)
{
m_expr = "";
m_fullexpr = "";
m_fullflush = false;
m_flush = false;
}
else if(m_flush == true)
{
m_expr = "";
m_flush = false;
}
m_expr += str;
UpdateData(FALSE);
}
void CSimpleCalcDlg::OnBnClickedZero()
{
AddString("0");
}
void CSimpleCalcDlg::OnBnClickedOne()
{
AddString("1");
}
void CSimpleCalcDlg::OnBnClickedTwo()
{
AddString("2");
}
void CSimpleCalcDlg::OnBnClickedThree()
{
AddString("3");
}
void CSimpleCalcDlg::OnBnClickedFour()
{
AddString("4");
}
void CSimpleCalcDlg::OnBnClickedFive()
{
AddString("5");
}
void CSimpleCalcDlg::OnBnClickedSix()
{
AddString("6");
}
void CSimpleCalcDlg::OnBnClickedSeven()
{
AddString("7");
}
void CSimpleCalcDlg::OnBnClickedEight()
{
AddString("8");
}
void CSimpleCalcDlg::OnBnClickedNine()
{
AddString("9");
}
void CSimpleCalcDlg::OnBnClickedDot()
{
UpdateData(TRUE);
if(m_expr.Find('.') == TRUE)
return;
AddString(".");
}
void CSimpleCalcDlg::OnEnSetfocusEdit2()
{
}
void CSimpleCalcDlg::OnEnChangeEdit2()
{
// TODO: If this is a RICHEDIT control, the control will not
// send this notification unless you override the CDialog::OnInitDialog()
// function and call CRichEditCtrl().SetEventMask()
// with the ENM_CHANGE flag ORed into the mask.
// TODO: Add your control notification handler code here
}
void CSimpleCalcDlg::OnEnKillfocusEdit2()
{
// TODO: Add your control notification handler code here
}
void CSimpleCalcDlg::OnBnClickedPlus()
{
UpdateData(TRUE);
if(m_fullflush == true)
{
m_expr = "";
m_fullexpr = "";
UpdateData(FALSE);
return;
}
if(m_flush == true)
{
m_flush = false;
m_opcount = 1;
m_expr = "";
m_opcode = OpPlus; // plus
}
else if( m_opcount == 0)
{
m_num1 = atof(m_expr);
m_opcount = 1;
m_fullexpr += m_expr;
m_fullexpr += "+";
m_expr = "";
m_opcode = OpPlus; // plus
}
else
{
if(Compute() < 0)
m_fullexpr = m_fullexpr.Left(m_fullexpr.GetLength() - 1);
m_fullexpr += "+";
m_opcode = OpPlus; // plus
}
UpdateData(FALSE);
}
void CSimpleCalcDlg::OnBnClickedMinus()
{
UpdateData(TRUE);
if(m_fullflush == true)
{
m_expr = "";
m_fullexpr = "";
UpdateData(FALSE);
return;
}
if(m_flush == true)
{
m_flush = false;
m_opcount = 1;
m_expr = "";
m_opcode = OpMinus; // minus
}
else if( m_opcount == 0)
{
m_num1 = atof(m_expr);
m_opcount = 1;
m_fullexpr += m_expr;
m_fullexpr += "-";
m_expr = "";
m_opcode = OpMinus; // minus
}
else
{
if(Compute() < 0)
m_fullexpr = m_fullexpr.Left(m_fullexpr.GetLength() - 1);
m_fullexpr += "-";
m_opcode = OpMinus; // minus
}
UpdateData(FALSE);
}
void CSimpleCalcDlg::OnBnClickedMul()
{
UpdateData(TRUE);
if(m_fullflush == true)
{
m_expr = "";
m_fullexpr = "";
UpdateData(FALSE);
return;
}
if(m_flush == true)
{
m_flush = false;
m_opcount = 1;
m_expr = "";
m_opcode = OpMultiply; // MUL
}
else if( m_opcount == 0)
{
m_num1 = atof(m_expr);
m_opcount = 1;
m_fullexpr += m_expr;
m_fullexpr += "*";
m_expr = "";
m_opcode = OpMultiply; // MUL
}
else
{
if(Compute() < 0)
m_fullexpr = m_fullexpr.Left(m_fullexpr.GetLength() - 1);
m_fullexpr += "*";
m_opcode = OpMultiply; // MUL
}
UpdateData(FALSE);
}
void CSimpleCalcDlg::OnBnClickedDiv()
{
UpdateData(TRUE);
if(m_fullflush == true)
{
m_expr = "";
m_fullexpr = "";
UpdateData(FALSE);
return;
}
if(m_flush == true)
{
m_flush = false;
m_opcount = 1;
m_expr = "";
m_opcode = OpDivide; // DIV
}
else if( m_opcount == 0)
{
m_num1 = atof(m_expr);
m_opcount = 1;
m_fullexpr += m_expr;
m_fullexpr += "/";
m_expr = "";
m_opcode = OpDivide; // DIV
}
else
{
if(Compute() < 0)
m_fullexpr = m_fullexpr.Left(m_fullexpr.GetLength() - 1);
m_fullexpr += "/";
m_opcode = OpDivide; // DIV
}
UpdateData(FALSE);
}
void CSimpleCalcDlg::OnBnClickedC()
{
m_num1 = m_num2 = m_result = 0;
m_expr = "";
m_opcode = m_opcount = 0;
UpdateData(FALSE);
}
void CSimpleCalcDlg::OnBnClickedPlusMinus()
{
UpdateData(TRUE);
m_expr.Format("%lf", -atof(m_expr));
UpdateData(FALSE);
}
void CSimpleCalcDlg::OnBnClickedSwf()
{
ShellExecute(NULL, _T("open"), _T("http://www.softwareandfinance.com"),
NULL, NULL, SW_SHOWNORMAL);
}
Click here to download the VS 2005 Project file and executable.
Output
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