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I wrote this code to change label text. but id does not change: 

void DateTimes::on_btnHourP_clicked() { int h=ui->txtHour->text().toInt(); if(h==24) h=-1; ui->txtHour->setText(QString::number(h++));//* }

but my label text not change. then I change the code to this: 

void DateTimes::on_btnHourP_clicked() { int h=ui->txtHour->text().toInt(); if(h==24) h=-1; h+=1;//* ui->txtHour->setText(QString::number(h));//* }

then the text of my label is change.
why?! could anyone solve my question?

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1 Answer 1

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Incremet operator ++ will use the value and then increment. If you want to use the incremented h value within the same expresion. use ++h.

ui->txtHour->setText(QString::number(++h));
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