How to match length in ToString

Questions
1

Hi,
I need a quick help.

ToString[001] returns 1 as a string (and not 001). How do I get a string with 0’s padded on the left to make it of a fixed size? In this example I want the output to be 001 (string form) instead of just 1. Someone please help.

Thanks.

2

Hello,

A somewhat quick and dirty way::

In[113]:= 
ToStringPad[n_, len_, pad_] :=
  FromCharacterCode[
   PadLeft[ToCharacterCode[ToString[n]], len, 
    First[ToCharacterCode[pad]]]];

ToStringPad[1, 3, "0"]
ToStringPad[22, 8, "="]

Out[114]= "001"

Out[115]= "======22"
3

IntegerString may be the function you are looking for.

IntegerString[1, 10, 3]