Function that use setfill and setw to return a QString

ApprenticeReno

Hi guys, i'm trying to write a function that gets two int and sets a particular String with a certain number of leading 0s.
Something like this:

int a=5;
int b=21;

void MainWindow::Function(int a,int b){
    
   // String s= std::setfill('0') << std::setw(a) << b ;
   // qDebug()<<"value of s -> "<<s;
   // Expected result -> 00021 ; 

 //if a=3 i would expect -> 021;
}

So i can do something like :

int z=35;
Function(4,z); // set String s='0035'
qDebug()<<"s value -> "<<s  // "s value -> 0035"

Any kind of help would be appreciated
thanks

Chris Kawa

QStringLiteral("%1").arg(b, a, 10, QChar('0'))

or

QString::number(b).rightJustified(a, '0')

ApprenticeReno

@Chris-Kawa Thank you very much.