Creating many folders in Windows?

Question

cmd/bat

Good day, there is such a code

chcp 1251
set papka=1
:1
set /A papka=papka+1
md 1 %papka%
if not %papka%==20 goto 1
del virus.bat

Here, in principle, it will clearly create 20 folders from 1 to 20, but I need to create 1200 folders, and so that the name would be 0001, 0002, 0003, and so on, what should I change here?

Answer 1

In batch files, all variables are strings!
set /a for arithmetic converts strings to numbers, does the operations, and stores the string in the result.
Therefore, padding with zeros is simple: we add the maximum required number of zeros to the number, then remove the excess using the substring extraction operation.
To extract substrings read:
set /?

Answer 2

Assumption -
set papka=0001
:0001
if not %papka%==1200 goto 1