rem this batch file is a simple source control, just backup your .cpp and .h to a backup profix dir, Rebol contribute.
@echo off
rem if file.txt exists, del it first
@if exist file.txt del file.txt
rem first extract file
goto :NotDone

:Input
set /p version=backup date:
echo %version%
rem backup the source file first
if exist Backup_%version% (
	echo you have already Backup under "Backup_%version%", change your input pls,*_*
	goto :Input
	)
if not exist Backup_%version% ( mkdir Backup_%version% && for /f %%a in (file.txt) do copy /Y %%a .\Backup_%version%\%%a )
goto:eof

:NotDone
echo not done
for /f "tokens=1,2 delims=." %%a in ('dir /b') do ( call set filename=%%a.%%b && call:%%b 2>nul )
goto :Input
:cpp
:h
	rem the %%a and %%b is out of effect here
	echo %filename% >> file.txt