linux系统及编程基础课后答案

firstNum -= secondNum;break; case Qt::Key_Asterisk: firstNum *= secondNum;break; case Qt::Key_Slash:

firstNum /= secondNum;break; default:

firstNum = firstNum; }

edit->setText(QString::number(firstNum)); }

void CWidget::setValue() {

QString tempStr; tempStr = edit->text();

if(tempStr.length() < edit->maxLength()) tempStr += ((QPushButton *)sender())->text(); else {

QMessageBox::information( this, tr(\ }

if(-1==oper) {

firstNum = tempStr.toInt();

edit->setText(QString::number(firstNum)); } else {

secondNum = tempStr.toInt();

edit->setText(QString::number(secondNum)); } }

void CWidget::setOper() {

QString str=((QPushButton *)sender())->text(); if(str == \

onClicked(Qt::Key_Plus); else if(str == \

onClicked(Qt::Key_Minus); else if(str == \

onClicked(Qt::Key_Asterisk); else if(str == \

onClicked(Qt::Key_Slash); else if(str == \ calculate(); }

void CWidget::clear() {

edit->clear();

edit->setText(tr(\ initialize(); }

void CWidget::initialize() {

firstNum = 0; secondNum = 0; oper = -1; }

void CWidget::createForm() {

setMinimumSize(80,200); setMaximumSize(80,200);

mainLayout = new QVBoxLayout(this,20); topLayout = new QHBoxLayout(mainLayout,30); edit = new QLineEdit(this,\ edit->setAlignment(Qt::AlignRight); edit->setMaxLength(9); edit->setText(tr(\ edit->setReadOnly(true); topLayout->addWidget(edit);

bottomLayout = new QGridLayout(mainLayout,4,4,10); int n;

for(int r=0; r<3; r++) for(int c=0; c<3; c++) {

n = c+3*r;

but