Use this:
QString number = QStringLiteral("%1").arg(yourNumber, 5, 10, QLatin1Char('0'));
5 here corresponds to 5 in printf("%05d")
. 10 is the radix, you can put 16 to print the number in hex.
QString QString::rightJustified ( int width, QChar fill = QLatin1Char( ' ' ), bool truncate = false ) const
int myNumber = 99;
QString result;
result = QString::number(myNumber).rightJustified(5, '0');
result is now 00099
The Short Example:
int myNumber = 9;
//Arg1: the number
//Arg2: how many 0 you want?
//Arg3: The base (10 - decimal, 16 hexadecimal - if you don't understand, choose 10)
// It seems like only decimal can support negative numbers.
QString number = QString("%1").arg(myNumber, 2, 10, QChar('0'));
Output will be: 09
Try:
QString s = s.sprintf("%08X",yournumber);
EDIT: According to the docs at http://qt-project.org/doc/qt-4.8/qstring.html#sprintf:
Warning: We do not recommend using QString::sprintf() in new Qt code. Instead, consider using QTextStream or arg(), both of which support Unicode strings seamlessly and are type-safe. Here's an example that uses QTextStream:
QString result;
QTextStream(&result) << "pi = " << 3.14;
// result == "pi = 3.14"
Read the other docs for features missing from this method.
I was trying this (which does work, but cumbersome).
QString s;
s.setNum(n,base);
s = s.toUpper();
presision -= s.length();
while(presision>0){
s.prepend('0');
presision--;
}
I use a technique since VB 5
QString theStr=QString("0000%1").arg(theNumber).right(4);
Success story sharing
"%1"
?%2
etc. See doc.qt.io/qt-5/qstring.html#arg