Formatting a string in Qt

Question

I'm using Qt 5.4. I need to format a QString representing a number and make sure that it's always with 3 digits, adding trailing zeros.

Let me give an example:

• If the string is "1" I need "100".

• If the string is "13" I need "130".

• If the string is "472" no changes.

Is there a way to do this without checking the length of the string?

Answer 1

If you rellay don't want to use the lenght.... use the maths!

my_str = Qstring::number(my_str.toInt()*pow(10,2-log10(my_str.toInt())))

or:

my_str = my_str.append('0',2-log10(my_str.toInt())) 

but it would be much simpler/quick to do this:

my_str = my_str.append('0',3-my_str.length())