China DOS Union

There is also the forum moderator. Why does the following code only display b%% instead of 123? Can variables not be nested?
CODE:
--------------------------------------------------------------------------------

set a=123456789
set b=3
echo %a:~0,%b%%

echo %a:~0,^%b%^% | findstr .

@echo off

setlocal EnableDelayedExpansion



set _tmp_F_S=C:\_delay.vbs

set _tmp_F_F=C:\_tmp.tmp

set delay=50

set s1=Booting

set s2=Booting fast

set s3=Damn it, booting

set s4=Are you going to boot or not, you bastard

set s5=Damn it!! If you don't boot again, I'll smash you!!

echo if WScript.Arguments.count = 1 then WScript.Sleep CInt(WScript.Arguments(0)) end if>%_tmp_F_S%

if exist %_tmp_F_F% del %_tmp_F_F%

for /L %%i in (1,1,4) do (call :show %%s%%i%% && call :fail %%s%%i%%)

call :show %s5%

call :suc

if exist %_tmp_F_S% del %_tmp_F_S%

if exist %_tmp_F_F% del %_tmp_F_F%

ping -n 1 127.1>nul

goto :EOF



:show

if "%~1"=="" goto :EOF

set s=%1

set /p ans=%cd%^><nul

set /A len=0

:comp_len

echo %%s:~%len%,1%% | find "ECHO">nul && goto end_comp

set /A "len+=1"

goto comp_len

:end_comp

set /A "len-=1"

for /L %%i in (0,1,%len%) do (cscript //nologo %_tmp_F_S% %delay% && set /p ans=!s:~%%i,1!<nul)

cscript //nologo %_tmp_F_S% 500

echo.

echo %cd%^>%1>>%_tmp_F_F%

echo.>>%_tmp_F_F%

goto :EOF



:fail

echo '%1' is not an internal or external command, nor a runnable program

or batch file.

echo '%1' is not an internal or external command, nor a runnable program>>%_tmp_F_F%

or batch file.>>%_tmp_F_F%

echo.>>%_tmp_F_F%

goto :EOF



:suc

ping -n 1 127.1>nul

set eqq================================================================================

set gtr=^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>^>

echo                            Loading Windows 2000 ...>>%_tmp_F_F%

echo.>>%_tmp_F_F%

for /L %%i in (0,1,79) do (set /A new=2*%%i && type %_tmp_F_F% && echo !gtr:~0,%%i!!eqq:~%%i,80! && ping -n 1 127.1>nul && cls)

goto :EOF

Originally posted by my3439955 at 2006-10-2 03:49:
Based on the discussions of the诸位 above
I will give a summary speech
The batch processing is as follows

@echo off

setlocal EnableDelayedExpansion



set _tmp_F_S=C:\_delay.vbs

set _tmp_F_F=C:\_tmp.tmp

set delay ... 

Originally posted by bg at 2006-10-8 23:43:
@echo off
color 1f
title.
mode con lines=10
rem Progress bar ▉▉▉▉▉
set work=0
set n=0
set mo=0
set number=0
rem all is the total number
set all=60
set time=%all%
:show

:check
if %num ...