Qt_纯手工简单计算器

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1、纯手工简单计算器效果如下：1..h文件从新定义button#ifndefBUTTON_H#defineBUTTON_H#include//![0]classButton:publicQToolButton{Q_OBJECTpublic:Button(constQString&text,QWidget*parent=0);QSizesizeHint()const;};//![0]#endifCalculator.h#ifndefCALCULATOR_H#defineCALCUL

2、ATOR_H#includeQT_BEGIN_NAMESPACEclassQLineEdit;QT_END_NAMESPACEclassButton;//![0]classCalculator:publicQDialog{Q_OBJECTpublic:Calculator(QWidget*parent=0);privateslots:voiddigitClicked();voidunaryOperatorClicked();voidadditiveOperatorClicked();

3、voidmultiplicativeOperatorClicked();voidequalClicked();voidpointClicked();voidchangeSignClicked();voidbackspaceClicked();voidclear();voidclearAll();voidclearMemory();voidreadMemory();voidsetMemory();voidaddToMemory();//![0]//![1]private://![1]//![2]Butt

4、on*createButton(constQString&text,constchar*member);voidabortOperation();boolcalculate(doublerightOperand,constQString&pendingOperator);//![2]//![3]doublesumInMemory;//![3]//![4]doublesumSoFar;//![4]//![5]doublefactorSoFar;//![5]//![6]QStringpendingAddi

5、tiveOperator;//![6]//![7]QStringpendingMultiplicativeOperator;//![7]//![8]boolwaitingForOperand;//![8]//![9]QLineEdit*display;//![9]//![10]enum{NumDigitButtons=10};Button*digitButtons[NumDigitButtons];};//![10]#endif1..cpp文件实现Button.cpp#include#i

6、nclude"button.h"//![0]Button::Button(constQString&text,QWidget*parent):QToolButton(parent){setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Preferred);setText(text);}//![0]//![1]QSizeButton::sizeHint()const//![1]//![2]{QSizesize=QToolButton::sizeHint()

7、;size.rheight()+=20;size.rwidth()=qMax(size.width(),size.height());returnsize;}//![2]Calculator.cpp#include#include#include"button.h"#include"calculator.h"//![0]Calculator::Calculator(QWidget*parent):QDialog(parent){sumInMemory=0.0;sumSoF

8、ar=0.0;factorSoFar=0.0;waitingForOperand=true;//![0]//![1]display=newQLineEdit("0");//![1]//![2]display->setReadOnly(true);display->setAlignment(Qt::AlignRight);display->setMaxLength(15);QFontfont=display->font();font.setPointSiz