Question

QT小程序问题

怎么才能在框内输出结果？PS.新手

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Answer 1

.h

private slot:
getMianJi();

.c

int a,S;
a = ui->lineBanJingr->text().toInt();
s = a*a*3.14159;
connect(ui->btnJiSuan,SIGNAL(clicked),this,SLOT(getMianJi()));

void 'nidelei'::getMianJi()
{
ui->lineMianJi->settext(QString::number(s));

}