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-/****************************************************************************

-**

-** Copyright (C) 2016 The Qt Company Ltd.

-** Contact: https://www.qt.io/licensing/

-**

-** This file is part of the examples of the Qt Toolkit.

-**

-** $QT_BEGIN_LICENSE:BSD$

-** Commercial License Usage

-** Licensees holding valid commercial Qt licenses may use this file in

-** accordance with the commercial license agreement provided with the

-** Software or, alternatively, in accordance with the terms contained in

-** a written agreement between you and The Qt Company. For licensing terms

-** and conditions see https://www.qt.io/terms-conditions. For further

-** information use the contact form at https://www.qt.io/contact-us.

-**

-** BSD License Usage

-** Alternatively, you may use this file under the terms of the BSD license

-** as follows:

-**

-** "Redistribution and use in source and binary forms, with or without

-** modification, are permitted provided that the following conditions are

-** met:

-**   * Redistributions of source code must retain the above copyright

-**     notice, this list of conditions and the following disclaimer.

-**   * Redistributions in binary form must reproduce the above copyright

-**     notice, this list of conditions and the following disclaimer in

-**     the documentation and/or other materials provided with the

-**     distribution.

-**   * Neither the name of The Qt Company Ltd nor the names of its

-**     contributors may be used to endorse or promote products derived

-**     from this software without specific prior written permission.

-**

-**

-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."

-**

-** $QT_END_LICENSE$

-**

-****************************************************************************/

-

-#ifndef CALCULATOR_H

-#define CALCULATOR_H

-

-#include <QWidget>

-

-QT_BEGIN_NAMESPACE

-class QLineEdit;

-QT_END_NAMESPACE

-class Button;

-

-//! [0]

-class Calculator : public QWidget

-{

-    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();

-//! [0]

-

-//! [1]

-private:

-//! [1] //! [2]

-    Button *createButton(const QString &text, const char *member);

-    void abortOperation();

-    bool calculate(double rightOperand, const QString &pendingOperator);

-//! [2]

-

-//! [3]

-    double sumInMemory;

-//! [3] //! [4]

-    double sumSoFar;

-//! [4] //! [5]

-    double factorSoFar;

-//! [5] //! [6]

-    QString pendingAdditiveOperator;

-//! [6] //! [7]

-    QString pendingMultiplicativeOperator;

-//! [7] //! [8]

-    bool waitingForOperand;

-//! [8]

-

-//! [9]

-    QLineEdit *display;

-//! [9] //! [10]

-

-    enum { NumDigitButtons = 10 };

-    Button *digitButtons[NumDigitButtons];

-};

-//! [10]

-

-#endif