#ifndef CALC_H
#define CALC_H

#include <QWidget>
#include <QStack>

class QLCDNumber;
class QPushButton;

class Calculator : public QWidget
{
    Q_OBJECT
private:
    QLCDNumber*         m_plcd;
    QStack<QString>     m_stk;
    QString             m_strDisplay;

public:
    Calculator(QWidget *wgt = 0);
    QPushButton* createButton(const QString& str);
    void calculate();
public slots:
    void slotButtonClicked();
};

#endif // CALC_H