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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);

     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];
     };

     #endif