Function: IsInteger

This lets your batch code check if input is decimal or hexadecimal. Other positional systems can be easily added if necessary. Supports signed numbers (decimal).

@echo off
:loop
set/p string=input 
call:IsHex string
if "%errorlevel%"=="0" (echo  The string is hexadecimal.)
if "%errorlevel%"=="1" (echo  The string is not hexadecimal.)
echo.
call:IsInteger string
if "%errorlevel%"=="0" (echo  The string is decimal.)
if "%errorlevel%"=="1" (echo  The string is not decimal.)
goto loop
:IsInteger
call:IsHex %1 10&&exit/b0||exit/b1
:IsHex
setlocal
set var=%% %1 %%
set var=%var: =%
call set var=%var%
if "%2"=="10" (if "%var:~0,1%"=="-" (set var=%var:~1%)) else (if "%var:~0,2%"=="0x" (set var=%var:~2%))
set IsHex=0
set var=%var:0= %
set var=%var:1= %
set var=%var:2= %
set var=%var:3= %
set var=%var:4= %
set var=%var:5= %
set var=%var:6= %
set var=%var:7= %
set var=%var:8= %
set var=%var:9= %
if "%2"=="10" (goto ishex_)
set var=%var:A= %
set var=%var:B= %
set var=%var:C= %
set var=%var:D= %
set var=%var:E= %
set var=%var:F= %
:ishex_
set var=%var: =%
if defined var (set IsHex=1)
endlocal&exit/b%IsHex%