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

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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