@echo off setlocal enabledelayedexpansion for /l %%i in (1, 1, 9) do ( for /l %%j in (1, 1, 9) do ( set /a "res=%%i * %%j" rem This condition imitate "\t" character if "!res:~1,2!" equ "" (set "res= !res!,") else set "res=!res!," rem Imitation of C's print function