display number on label

[aj2903]

hii..
I want to display number on the label;
I can do this by following code :

int num;
QString qstr = QString::number(num);
ui.label->setText(qstr);

int num;
QString qstr = QString::number(num);
ui.label->setText(qstr);

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my problem is if the number is single digit i.e 2 i want to display it as 02 in label.
how can this be done?