diff options
Diffstat (limited to 'examples/widgets/widgets/calculator/calculator.cpp')
| -rw-r--r-- | examples/widgets/widgets/calculator/calculator.cpp | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/examples/widgets/widgets/calculator/calculator.cpp b/examples/widgets/widgets/calculator/calculator.cpp index dd908cf40a..2c3669b7a8 100644 --- a/examples/widgets/widgets/calculator/calculator.cpp +++ b/examples/widgets/widgets/calculator/calculator.cpp @@ -48,21 +48,18 @@ ** ****************************************************************************/ -#include "button.h" #include "calculator.h" +#include "button.h" -#include <QtWidgets> - -#include <cmath> +#include <QGridLayout> +#include <QLineEdit> +#include <QtMath> //! [0] Calculator::Calculator(QWidget *parent) - : QWidget(parent) + : QWidget(parent), sumInMemory(0.0), sumSoFar(0.0) + , factorSoFar(0.0), waitingForOperand(true) { - sumInMemory = 0.0; - sumSoFar = 0.0; - factorSoFar = 0.0; - waitingForOperand = true; //! [0] //! [1] @@ -78,9 +75,8 @@ Calculator::Calculator(QWidget *parent) //! [2] //! [4] - for (int i = 0; i < NumDigitButtons; ++i) { + 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("\302\261"), SLOT(changeSignClicked())); @@ -194,6 +190,8 @@ void Calculator::additiveOperatorClicked() //! [10] //! [11] { Button *clickedButton = qobject_cast<Button *>(sender()); + if (!clickedButton) + return; QString clickedOperator = clickedButton->text(); double operand = display->text().toDouble(); @@ -233,6 +231,8 @@ void Calculator::additiveOperatorClicked() void Calculator::multiplicativeOperatorClicked() { Button *clickedButton = qobject_cast<Button *>(sender()); + if (!clickedButton) + return; QString clickedOperator = clickedButton->text(); double operand = display->text().toDouble(); |