I am experimenting with a piece of code I found on the internet (I'm still relatively new to c++), but my visual c++ express edition and visual c++ 2005 ide's are not compiling it giving some errors I can't understand fully.
this is the code
/****************************************************
* File: BasicCalculator.h
* A calculator program built using MFC dialog box
****************************************************/
#include "stdafx.h"
#include <afxwin.h>
#include <strstream>
#include <iomanip>
#include <cmath>
#include "BasicCalculator_ids.h"
#include "BasicCalculator.h"
#include <fstream>
#include <String.h>
#include <cstdlib>
#include <stdio.h>
CCalculatorDialog::CCalculatorDialog()
: CDialog( "Calculator" )
{
clear();
}
// clear result and entry
void CCalculatorDialog::clear()
{
m_fResult = 0.0;
m_opCode = NONE;
clearEntry();
}
// clear entry (number being input)
void CCalculatorDialog::clearEntry()
{
m_szEntry[ 0 ] = '\0';
m_nEntryLen = 0;
m_bHavePoint = false;
}
// user enters a character
void CCalculatorDialog::enter( char ch )
{
m_szEntry[ m_nEntryLen++ ] = ch;
m_szEntry[ m_nEntryLen ] = '\0';
showEntry();
}
// process any digit button the user enters
afx_msg void CCalculatorDialog::HandleDigitPressed( UINT digit )
{
if ( m_nEntryLen < MAX_DIGITS )
{
// convert message id to character
enter( digit - IDC_ZERO + '0' );
}
}
// the user has entered a decimal point
afx_msg void CCalculatorDialog::HandleDecPointPressed()
{
if ( !m_bHavePoint && m_nEntryLen < MAX_DIGITS )
{
m_bHavePoint = true; // allow only one point per number
enter( '.' );
}
}
// the user has pressed the clear all data button
afx_msg void CCalculatorDialog::HandleClearPressed()
{
clear();
showEntry();
}
// the user has pressed the clear just the data being entered button
afx_msg void CCalculatorDialog::HandleClearEntryPressed()
{
clearEntry();
showEntry();
m_opCode = EQ;
doOp();
}
// the user has pressed the Multiplication button
afx_msg void CCalculatorDialog::HandleMultPressed()
{
doOp();
m_opCode = MPY;
}
// the user has pressed the Division button
afx_msg void CCalculatorDialog::HandleDivPressed()
{
doOp();
m_opCode = DIV;
}
// the user has pressed the Minus button
afx_msg void CCalculatorDialog::HandleMinusPressed()
{
doOp() ;
m_opCode = SUB ;
}
// the user has pressed the Addition button
afx_msg void CCalculatorDialog::HandlePlusPressed()
{
doOp() ;
m_opCode = ADD ;
}
// the user has pressed the +/- button
afx_msg void CCalculatorDialog::HandlePMPressed()
{
m_fResult = -1.0 * m_fResult ;
showResult();
m_opCode = EQ;
}
// the user has pressed the Equal button
afx_msg void CCalculatorDialog::HandleEqualPressed()
{
doOp();
m_opCode = EQ;
}
// the user has pressed the Exit button
afx_msg void CCalculatorDialog::HandleExitPressed() {
if( AfxMessageBox( "Do you really want to exit?", MB_YESNO ) == IDYES )
OnOK() ;
}
afx_msg void CCalculatorDialog::HandleMyHelpPressed() {
WinExec( "c:\\Program Files\\Internet Explorer\\IExplore.exe http://127.0.0.1/myCalcHelp/help.aspx" , SW_SHOW ) ;
}
afx_msg void CCalculatorDialog::HandleMyAboutPressed() {
WinExec( "c:\\Program Files\\Internet Explorer\\IExplore.exe http://127.0.0.1/myCalcHelp/index.aspx" , SW_SHOW ) ;
}
// do the previous infix operator, if any
void CCalculatorDialog::doOp() {
fFirstNumber = atof( m_szEntry );
fTemp = m_fResult ;
switch ( m_opCode ) {
case MPY:
m_fResult *= fFirstNumber;
break;
case DIV:
if( fFirstNumber == 0.0 )
AfxMessageBox( "You cannot divide by zero.", MB_OK ) ;
else {
m_fResult /= fFirstNumber ;
}
break;
case SUB:
m_fResult -= fFirstNumber;
break;
case ADD:
m_fResult += fFirstNumber;
break;
case EQ:
case NONE:
if ( m_nEntryLen > 0 ) // if user entered a new number,
m_fResult = fFirstNumber; // make it the left operand
}
m_opCode = NONE;
clearEntry();
showResult();
}
void CCalculatorDialog::showResult() {
static char m_szString[ MAX_DIGITS + 1 ];
static ostrstream m_oStream( m_szString, MAX_DIGITS );
m_oStream.seekp( 0 );
m_oStream << setprecision( MAX_DIGITS );
m_oStream << m_fResult << ends;
CEdit *pDisplay = ( CEdit * ) GetDlgItem( IDC_DISPLAY );
pDisplay->SetWindowText( m_szString );
}
void CCalculatorDialog::showEntry() {
CEdit *pDisplay = ( CEdit * ) GetDlgItem( IDC_DISPLAY );
if ( pDisplay )
pDisplay->SetWindowText( m_szEntry );
}
BEGIN_MESSAGE_MAP( CCalculatorDialog, CDialog )
ON_COMMAND_RANGE( IDC_ZERO, IDC_NINE, HandleDigitPressed )
ON_COMMAND( IDC_DECPT, HandleDecPointPressed )
ON_COMMAND( IDC_CE, HandleClearEntryPressed )
ON_COMMAND( IDC_CLR, HandleClearPressed )
ON_COMMAND( IDC_MULT, HandleMultPressed )
ON_COMMAND( IDC_DIV, HandleDivPressed )
ON_COMMAND( IDC_MINUS, HandleMinusPressed )
ON_COMMAND( IDC_PLUS, HandlePlusPressed )
ON_COMMAND( IDC_PM, HandlePMPressed )
ON_COMMAND( IDC_EQUAL, HandleEqualPressed )
ON_COMMAND( IDC_EXIT, HandleExitPressed )
ON_COMMAND( IDC_MYHELP, HandleMyHelpPressed )
ON_COMMAND( IDC_MYABOUT, HandleMyAboutPressed )
END_MESSAGE_MAP()
// dialog-based application
class CCalculatorApp : public CWinApp {
public:
BOOL InitInstance() {
CCalculatorDialog calculatorDialog;
calculatorDialog.DoModal(); // run dialog
return FALSE; // finished
}
} calculator;O.K, so when I build this code, I get the following errors:
------ Rebuild All started: Project: BasicCalculator, Configuration: Debug Win32 ------
Deleting intermediate and output files for project 'BasicCalculator', configuration 'Debug|Win32'
Compiling...
BasicCalculator.cpp
c:\ooc++\win32apicalc\basiccalculator.cpp(182) : error C2146: syntax error : missing ';' before identifier 'm_oStream'
c:\ooc++\win32apicalc\basiccalculator.cpp(182) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
c:\ooc++\win32apicalc\basiccalculator.cpp(182) : error C3861: 'm_oStream': identifier not found
c:\ooc++\win32apicalc\basiccalculator.cpp(184) : error C2065: 'm_oStream' : undeclared identifier
c:\ooc++\win32apicalc\basiccalculator.cpp(184) : error C2228: left of '.seekp' must have class/struct/union
type is ''unknown-type''
c:\ooc++\win32apicalc\basiccalculator.cpp(185) : error C2065: 'm_oStream' : undeclared identifier
c:\ooc++\win32apicalc\basiccalculator.cpp(185) : error C3861: 'setprecision': identifier not found
c:\ooc++\win32apicalc\basiccalculator.cpp(186) : error C2065: 'm_oStream' : undeclared identifier
c:\ooc++\win32apicalc\basiccalculator.cpp(186) : error C2065: 'ends' : undeclared identifier
Build log was saved at "file://c:\OOC++\win32apicalc\Debug\BuildLog.htm""
BasicCalculator - 9 error(s), 0 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========Could anyone help me with this?
PS: I've modified the code a bit already because it had almost 70 errors before!
