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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