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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">calculator.h Example File<br /><small><small>widgets/calculator/calculator.h</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

** information about Qt Commercial License Agreements.

** See http://www.trolltech.com/qpl/ for QPL licensing information.

** See http://www.trolltech.com/gpl/ for GPL licensing information.

** Contact info@trolltech.com if any conditions of this licensing are

** not clear to you.

** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE

** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

****************************************************************************/

#ifndef CALCULATOR_H

#define CALCULATOR_H

#include <QDialog>

class QLineEdit;

class Button;

class Calculator : public QDialog

{

Q_OBJECT

public:

Calculator(QWidget *parent = 0);

protected:

bool eventFilter(QObject *target, QEvent *event);

private slots:

void digitClicked();

void unaryOperatorClicked();

void additiveOperatorClicked();

void multiplicativeOperatorClicked();

void equalClicked();

void pointClicked();

void changeSignClicked();

void backspaceClicked();

void clear();

void clearAll();

void clearMemory();

void readMemory();

void setMemory();

void addToMemory();

private:

Button *createButton(const QString &text, const QColor &color,

const char *member);

void abortOperation();

bool calculate(double rightOperand, const QString &pendingOperator);

double sumInMemory;

double sumSoFar;

double factorSoFar;

QString pendingAdditiveOperator;

QString pendingMultiplicativeOperator;

bool waitingForOperand;

QLineEdit *display;

enum { NumDigitButtons = 10 };

Button *digitButtons[NumDigitButtons];

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Button *pointButton;

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Button *changeSignButton;

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Button *backspaceButton;

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Button *clearButton;

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Button *clearAllButton;

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Button *clearMemoryButton;

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Button *readMemoryButton;

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Button *setMemoryButton;

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Button *addToMemoryButton;

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Button *divisionButton;

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Button *timesButton;

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Button *minusButton;

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Button *plusButton;

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Button *squareRootButton;

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Button *powerButton;

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Button *reciprocalButton;

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Button *equalButton;

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};

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#endif</pre>

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