China DOS Union

This is a *.bat file I wrote by following the example in a book, but it gives an error when I run it.
Please help me take a look



@echo off
choice /c:dme defrag,mem,end
if errorlevel 3 goto defrag
if errorlevel 2 goto mem
if errotlevel 1 goto end

:defrag
c:\windows\defrag.exe
goto end
:mem
mem
goto end
:end
echo good bye

After running it, choosing d or m is fine, but choosing e gives the result for choosing d

Re xuan5272095:

It's obviously an input error:
if errotlevel 3 goto end -> if errorlevel 3 goto end

Make a choice: choice /c:dme defrag,mem,end (no problem)
Choose end (errorlevel 1)
if errorlevel 3 goto defrag -- errorlevel is less than 3, skip
if errorlevel 2 goto mem -- errorlevel is less than 2, skip
if errotlevel 1 goto end -- invalid statement, skip and show an error message
:defrag -- label, skip
c:\windows\defrag.exe -- execute
goto end -- go to the end

That is why choosing e gives the result for choosing d

Add one line: goto error

if errorlevel 3 goto defrag
if errorlevel 2 goto mem
if errotlevel 1 goto end
goto error

Then make an error entry

:error
ECHO Choice.com not found
goto end

This can avoid errors caused by not finding choice.com (and if the BAT is written wrong, it will also show an error message)