Calculator.h

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// ======================================================================
//  Calculator.h
// ======================================================================
//                   This file is a part of the book 
//             "Qt 5.10 Professional programming with C++"
//                       http://qt-book.com
// ======================================================================
//  Copyright (c) 2017 by Max Schlee
// ======================================================================

#pragma once

#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* pwgt = 0);

    QPushButton* createButton(const QString& str);
    void         calculate   (                  );

public slots:
    void slotButtonClicked();
};