summaryrefslogtreecommitdiffstats
path: root/examples/widgets/calculator
diff options
context:
space:
mode:
Diffstat (limited to 'examples/widgets/calculator')
-rw-r--r--examples/widgets/calculator/button.cpp64
-rw-r--r--examples/widgets/calculator/button.h59
-rw-r--r--examples/widgets/calculator/calculator.cpp398
-rw-r--r--examples/widgets/calculator/calculator.h108
-rw-r--r--examples/widgets/calculator/calculator.pro11
-rw-r--r--examples/widgets/calculator/main.cpp52
6 files changed, 692 insertions, 0 deletions
diff --git a/examples/widgets/calculator/button.cpp b/examples/widgets/calculator/button.cpp
new file mode 100644
index 0000000..e77442e
--- /dev/null
+++ b/examples/widgets/calculator/button.cpp
@@ -0,0 +1,64 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "button.h"
+
+//! [0]
+Button::Button(const QString &text, QWidget *parent)
+ : QToolButton(parent)
+{
+ setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
+ setText(text);
+}
+//! [0]
+
+//! [1]
+QSize Button::sizeHint() const
+//! [1] //! [2]
+{
+ QSize size = QToolButton::sizeHint();
+ size.rheight() += 20;
+ size.rwidth() = qMax(size.width(), size.height());
+ return size;
+}
+//! [2]
diff --git a/examples/widgets/calculator/button.h b/examples/widgets/calculator/button.h
new file mode 100644
index 0000000..5637e6b
--- /dev/null
+++ b/examples/widgets/calculator/button.h
@@ -0,0 +1,59 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef BUTTON_H
+#define BUTTON_H
+
+#include <QToolButton>
+
+//! [0]
+class Button : public QToolButton
+{
+ Q_OBJECT
+
+public:
+ Button(const QString &text, QWidget *parent = 0);
+
+ QSize sizeHint() const;
+};
+//! [0]
+
+#endif
diff --git a/examples/widgets/calculator/calculator.cpp b/examples/widgets/calculator/calculator.cpp
new file mode 100644
index 0000000..9c2ef4a
--- /dev/null
+++ b/examples/widgets/calculator/calculator.cpp
@@ -0,0 +1,398 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include <math.h>
+
+#include "button.h"
+#include "calculator.h"
+
+//! [0]
+Calculator::Calculator(QWidget *parent)
+ : QDialog(parent)
+{
+ sumInMemory = 0.0;
+ sumSoFar = 0.0;
+ factorSoFar = 0.0;
+ waitingForOperand = true;
+//! [0]
+
+//! [1]
+ display = new QLineEdit("0");
+//! [1] //! [2]
+ display->setReadOnly(true);
+ display->setAlignment(Qt::AlignRight);
+ display->setMaxLength(15);
+
+ QFont font = display->font();
+ font.setPointSize(font.pointSize() + 8);
+ display->setFont(font);
+//! [2]
+
+//! [4]
+ for (int i = 0; i < NumDigitButtons; ++i) {
+ digitButtons[i] = createButton(QString::number(i), SLOT(digitClicked()));
+ }
+
+ Button *pointButton = createButton(tr("."), SLOT(pointClicked()));
+ Button *changeSignButton = createButton(tr("\261"), SLOT(changeSignClicked()));
+
+ Button *backspaceButton = createButton(tr("Backspace"), SLOT(backspaceClicked()));
+ Button *clearButton = createButton(tr("Clear"), SLOT(clear()));
+ Button *clearAllButton = createButton(tr("Clear All"), SLOT(clearAll()));
+
+ Button *clearMemoryButton = createButton(tr("MC"), SLOT(clearMemory()));
+ Button *readMemoryButton = createButton(tr("MR"), SLOT(readMemory()));
+ Button *setMemoryButton = createButton(tr("MS"), SLOT(setMemory()));
+ Button *addToMemoryButton = createButton(tr("M+"), SLOT(addToMemory()));
+
+ Button *divisionButton = createButton(tr("\367"), SLOT(multiplicativeOperatorClicked()));
+ Button *timesButton = createButton(tr("\327"), SLOT(multiplicativeOperatorClicked()));
+ Button *minusButton = createButton(tr("-"), SLOT(additiveOperatorClicked()));
+ Button *plusButton = createButton(tr("+"), SLOT(additiveOperatorClicked()));
+
+ Button *squareRootButton = createButton(tr("Sqrt"), SLOT(unaryOperatorClicked()));
+ Button *powerButton = createButton(tr("x\262"), SLOT(unaryOperatorClicked()));
+ Button *reciprocalButton = createButton(tr("1/x"), SLOT(unaryOperatorClicked()));
+ Button *equalButton = createButton(tr("="), SLOT(equalClicked()));
+//! [4]
+
+//! [5]
+ QGridLayout *mainLayout = new QGridLayout;
+//! [5] //! [6]
+ mainLayout->setSizeConstraint(QLayout::SetFixedSize);
+
+ mainLayout->addWidget(display, 0, 0, 1, 6);
+ mainLayout->addWidget(backspaceButton, 1, 0, 1, 2);
+ mainLayout->addWidget(clearButton, 1, 2, 1, 2);
+ mainLayout->addWidget(clearAllButton, 1, 4, 1, 2);
+
+ mainLayout->addWidget(clearMemoryButton, 2, 0);
+ mainLayout->addWidget(readMemoryButton, 3, 0);
+ mainLayout->addWidget(setMemoryButton, 4, 0);
+ mainLayout->addWidget(addToMemoryButton, 5, 0);
+
+ for (int i = 1; i < NumDigitButtons; ++i) {
+ int row = ((9 - i) / 3) + 2;
+ int column = ((i - 1) % 3) + 1;
+ mainLayout->addWidget(digitButtons[i], row, column);
+ }
+
+ mainLayout->addWidget(digitButtons[0], 5, 1);
+ mainLayout->addWidget(pointButton, 5, 2);
+ mainLayout->addWidget(changeSignButton, 5, 3);
+
+ mainLayout->addWidget(divisionButton, 2, 4);
+ mainLayout->addWidget(timesButton, 3, 4);
+ mainLayout->addWidget(minusButton, 4, 4);
+ mainLayout->addWidget(plusButton, 5, 4);
+
+ mainLayout->addWidget(squareRootButton, 2, 5);
+ mainLayout->addWidget(powerButton, 3, 5);
+ mainLayout->addWidget(reciprocalButton, 4, 5);
+ mainLayout->addWidget(equalButton, 5, 5);
+ setLayout(mainLayout);
+
+ setWindowTitle(tr("Calculator"));
+}
+//! [6]
+
+//! [7]
+void Calculator::digitClicked()
+{
+ Button *clickedButton = qobject_cast<Button *>(sender());
+ int digitValue = clickedButton->text().toInt();
+ if (display->text() == "0" && digitValue == 0.0)
+ return;
+
+ if (waitingForOperand) {
+ display->clear();
+ waitingForOperand = false;
+ }
+ display->setText(display->text() + QString::number(digitValue));
+}
+//! [7]
+
+//! [8]
+void Calculator::unaryOperatorClicked()
+//! [8] //! [9]
+{
+ Button *clickedButton = qobject_cast<Button *>(sender());
+ QString clickedOperator = clickedButton->text();
+ double operand = display->text().toDouble();
+ double result = 0.0;
+
+ if (clickedOperator == tr("Sqrt")) {
+ if (operand < 0.0) {
+ abortOperation();
+ return;
+ }
+ result = sqrt(operand);
+ } else if (clickedOperator == tr("x\262")) {
+ result = pow(operand, 2.0);
+ } else if (clickedOperator == tr("1/x")) {
+ if (operand == 0.0) {
+ abortOperation();
+ return;
+ }
+ result = 1.0 / operand;
+ }
+ display->setText(QString::number(result));
+ waitingForOperand = true;
+}
+//! [9]
+
+//! [10]
+void Calculator::additiveOperatorClicked()
+//! [10] //! [11]
+{
+ Button *clickedButton = qobject_cast<Button *>(sender());
+ QString clickedOperator = clickedButton->text();
+ double operand = display->text().toDouble();
+
+//! [11] //! [12]
+ if (!pendingMultiplicativeOperator.isEmpty()) {
+//! [12] //! [13]
+ if (!calculate(operand, pendingMultiplicativeOperator)) {
+ abortOperation();
+ return;
+ }
+ display->setText(QString::number(factorSoFar));
+ operand = factorSoFar;
+ factorSoFar = 0.0;
+ pendingMultiplicativeOperator.clear();
+ }
+
+//! [13] //! [14]
+ if (!pendingAdditiveOperator.isEmpty()) {
+//! [14] //! [15]
+ if (!calculate(operand, pendingAdditiveOperator)) {
+ abortOperation();
+ return;
+ }
+ display->setText(QString::number(sumSoFar));
+ } else {
+ sumSoFar = operand;
+ }
+
+//! [15] //! [16]
+ pendingAdditiveOperator = clickedOperator;
+//! [16] //! [17]
+ waitingForOperand = true;
+}
+//! [17]
+
+//! [18]
+void Calculator::multiplicativeOperatorClicked()
+{
+ Button *clickedButton = qobject_cast<Button *>(sender());
+ QString clickedOperator = clickedButton->text();
+ double operand = display->text().toDouble();
+
+ if (!pendingMultiplicativeOperator.isEmpty()) {
+ if (!calculate(operand, pendingMultiplicativeOperator)) {
+ abortOperation();
+ return;
+ }
+ display->setText(QString::number(factorSoFar));
+ } else {
+ factorSoFar = operand;
+ }
+
+ pendingMultiplicativeOperator = clickedOperator;
+ waitingForOperand = true;
+}
+//! [18]
+
+//! [20]
+void Calculator::equalClicked()
+{
+ double operand = display->text().toDouble();
+
+ if (!pendingMultiplicativeOperator.isEmpty()) {
+ if (!calculate(operand, pendingMultiplicativeOperator)) {
+ abortOperation();
+ return;
+ }
+ operand = factorSoFar;
+ factorSoFar = 0.0;
+ pendingMultiplicativeOperator.clear();
+ }
+ if (!pendingAdditiveOperator.isEmpty()) {
+ if (!calculate(operand, pendingAdditiveOperator)) {
+ abortOperation();
+ return;
+ }
+ pendingAdditiveOperator.clear();
+ } else {
+ sumSoFar = operand;
+ }
+
+ display->setText(QString::number(sumSoFar));
+ sumSoFar = 0.0;
+ waitingForOperand = true;
+}
+//! [20]
+
+//! [22]
+void Calculator::pointClicked()
+{
+ if (waitingForOperand)
+ display->setText("0");
+ if (!display->text().contains("."))
+ display->setText(display->text() + tr("."));
+ waitingForOperand = false;
+}
+//! [22]
+
+//! [24]
+void Calculator::changeSignClicked()
+{
+ QString text = display->text();
+ double value = text.toDouble();
+
+ if (value > 0.0) {
+ text.prepend(tr("-"));
+ } else if (value < 0.0) {
+ text.remove(0, 1);
+ }
+ display->setText(text);
+}
+//! [24]
+
+//! [26]
+void Calculator::backspaceClicked()
+{
+ if (waitingForOperand)
+ return;
+
+ QString text = display->text();
+ text.chop(1);
+ if (text.isEmpty()) {
+ text = "0";
+ waitingForOperand = true;
+ }
+ display->setText(text);
+}
+//! [26]
+
+//! [28]
+void Calculator::clear()
+{
+ if (waitingForOperand)
+ return;
+
+ display->setText("0");
+ waitingForOperand = true;
+}
+//! [28]
+
+//! [30]
+void Calculator::clearAll()
+{
+ sumSoFar = 0.0;
+ factorSoFar = 0.0;
+ pendingAdditiveOperator.clear();
+ pendingMultiplicativeOperator.clear();
+ display->setText("0");
+ waitingForOperand = true;
+}
+//! [30]
+
+//! [32]
+void Calculator::clearMemory()
+{
+ sumInMemory = 0.0;
+}
+
+void Calculator::readMemory()
+{
+ display->setText(QString::number(sumInMemory));
+ waitingForOperand = true;
+}
+
+void Calculator::setMemory()
+{
+ equalClicked();
+ sumInMemory = display->text().toDouble();
+}
+
+void Calculator::addToMemory()
+{
+ equalClicked();
+ sumInMemory += display->text().toDouble();
+}
+//! [32]
+//! [34]
+Button *Calculator::createButton(const QString &text, const char *member)
+{
+ Button *button = new Button(text);
+ connect(button, SIGNAL(clicked()), this, member);
+ return button;
+}
+//! [34]
+
+//! [36]
+void Calculator::abortOperation()
+{
+ clearAll();
+ display->setText(tr("####"));
+}
+//! [36]
+
+//! [38]
+bool Calculator::calculate(double rightOperand, const QString &pendingOperator)
+{
+ if (pendingOperator == tr("+")) {
+ sumSoFar += rightOperand;
+ } else if (pendingOperator == tr("-")) {
+ sumSoFar -= rightOperand;
+ } else if (pendingOperator == tr("\327")) {
+ factorSoFar *= rightOperand;
+ } else if (pendingOperator == tr("\367")) {
+ if (rightOperand == 0.0)
+ return false;
+ factorSoFar /= rightOperand;
+ }
+ return true;
+}
+//! [38]
diff --git a/examples/widgets/calculator/calculator.h b/examples/widgets/calculator/calculator.h
new file mode 100644
index 0000000..4955c28
--- /dev/null
+++ b/examples/widgets/calculator/calculator.h
@@ -0,0 +1,108 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CALCULATOR_H
+#define CALCULATOR_H
+
+#include <QDialog>
+
+QT_BEGIN_NAMESPACE
+class QLineEdit;
+QT_END_NAMESPACE
+class Button;
+
+//! [0]
+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();
+//! [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
diff --git a/examples/widgets/calculator/calculator.pro b/examples/widgets/calculator/calculator.pro
new file mode 100644
index 0000000..a9a50d6
--- /dev/null
+++ b/examples/widgets/calculator/calculator.pro
@@ -0,0 +1,11 @@
+HEADERS = button.h \
+ calculator.h
+SOURCES = button.cpp \
+ calculator.cpp \
+ main.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/calculator
+sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS calculator.pro
+sources.path = $$[QT_INSTALL_EXAMPLES]/widgets/calculator
+INSTALLS += target sources
diff --git a/examples/widgets/calculator/main.cpp b/examples/widgets/calculator/main.cpp
new file mode 100644
index 0000000..ddb0028
--- /dev/null
+++ b/examples/widgets/calculator/main.cpp
@@ -0,0 +1,52 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QApplication>
+
+#include "calculator.h"
+
+int main(int argc, char *argv[])
+{
+ QApplication app(argc, argv);
+ Calculator calc;
+ calc.show();
+ return app.exec();
+}