中国DOS联盟

@echo off

for /f %%a in (a.txt) do (

   Setlocal EnableDelayedExpansion

   set str=%%a

   for /l %%i in (0 1 9) do set str=!str:%%i= %%i!

   for %%i in (!str!) do set /a .%%i+=1

   for /l %%i in (0 1 9) do (

     if defined .%%i (

       for /l %%j in (1 1 !.%%i!) do set num=!num!%%i

   ))

   echo !num!

   endlocal

)

pause