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# calculator.h Example File
widgets/calculator/calculator.h

     /****************************************************************************
     **
     ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of
     ** this file.  Please review the following information to ensure GNU
     ** General Public Licensing requirements will be met:
     ** http://www.trolltech.com/products/qt/opensource.html
     **
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     ** review the following information:
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     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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     ****************************************************************************/

     #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];

         Button *pointButton;
         Button *changeSignButton;
         Button *backspaceButton;
         Button *clearButton;
         Button *clearAllButton;
         Button *clearMemoryButton;
         Button *readMemoryButton;
         Button *setMemoryButton;
         Button *addToMemoryButton;

         Button *divisionButton;
         Button *timesButton;
         Button *minusButton;
         Button *plusButton;
         Button *squareRootButton;
         Button *powerButton;
         Button *reciprocalButton;
         Button *equalButton;
     };

     #endif