Batch File input validation - Make sure user entered an integer

Question

I\'m experimenting with a Windows batch file to perform a simple operation which requires the user to enter a non-negative integer. I\'m using simple batch-file techniques t

Answer 1

:ASK
SET /P number= Choose a number [1 or 2]: 
IF %number% EQU 1 GOTO ONE
IF %number% NEQ 1 (
  IF %number% EQU 2 GOTO TWO
  IF %number% NEQ 2 (
    CLS
    ECHO You need to choose a NUMBER: 1 OR 2.
    ECHO.
    GOTO ASK
  )
)

It works fine to me. If he chooses numbers less or greater, strings, floating number etc, he wil receive a message ("You need to choose a NUMBER: 1 OR 2.") and the INPUT will be asked again.