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50
51#ifndef CALCULATOR_H
52#define CALCULATOR_H
53
54#include <QWidget>
55
56QT_BEGIN_NAMESPACE
57class QLineEdit;
58QT_END_NAMESPACE
59class Button;
60
61//! [0]
62class Calculator : public QWidget
63{
64 Q_OBJECT
65
66public:
67 Calculator(QWidget *parent = nullptr);
68
69private slots:
70 void digitClicked();
71 void unaryOperatorClicked();
72 void additiveOperatorClicked();
73 void multiplicativeOperatorClicked();
74 void equalClicked();
75 void pointClicked();
76 void changeSignClicked();
77 void backspaceClicked();
78 void clear();
79 void clearAll();
80 void clearMemory();
81 void readMemory();
82 void setMemory();
83 void addToMemory();
84//! [0]
85
86//! [1]
87private:
88//! [1] //! [2]
89 Button *createButton(const QString &text, const char *member);
90 void abortOperation();
91 bool calculate(double rightOperand, const QString &pendingOperator);
92//! [2]
93
94//! [3]
95 double sumInMemory;
96//! [3] //! [4]
97 double sumSoFar;
98//! [4] //! [5]
99 double factorSoFar;
100//! [5] //! [6]
101 QString pendingAdditiveOperator;
102//! [6] //! [7]
103 QString pendingMultiplicativeOperator;
104//! [7] //! [8]
105 bool waitingForOperand;
106//! [8]
107
108//! [9]
109 QLineEdit *display;
110//! [9] //! [10]
111
112 enum { NumDigitButtons = 10 };
113 Button *digitButtons[NumDigitButtons];
114};
115//! [10]
116
117#endif
118

source code of qtbase/examples/widgets/widgets/calculator/calculator.h