[数值计算] [已解决]批处理%random%怎样随机获取/输出字母？

@Echo Off&SetLocal EnableDelayedExpansion 
Set "Code=abcdefghijklmnopqrstuvwxyz"
For /L %%i In (1,1,20) Do (
  Set /A Num=!Random!%%26
  For %%j In (!Num!) Do Echo 随机数字：%%j 随机字母：!Code:~%%j,1!
)
Pause>Nul
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@Echo Off&SetLocal EnableDelayedExpansion 
Set "Code=abcdefghijklmnopqrstuvwxyz1234567890QWERTYUIOPASDFGHJKLZXCVBNM"
For /L %%i In (1,1,20) Do (
  Set /A Num=!Random!%%62
  set abc=!abc!!Num!
  For %%j In (!Num!) Do Echo !Code:~%%j,100!
)
Pause>Nul
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!Code:~%%j,1!
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@echo off
rem 调用方法call :rletter 结果 长度 大小写[1小写|2大写|默认随机大小写]
call :rletter s 5 2
echo;%s%
pause&exit
:rletter
setlocal enabledelayedexpansion
if "%2" equ "" (set e=1) else (
    if "%2" equ "0" (set e=1) else (
        echo;%2|findstr "^[1-9][0-9]*$" >nul||set e=1
    )
)
if defined e echo;Error&goto :eof
set a=abcdefghijklmnopqrstuvwxyz
set b=ABCDEFGHIJKLMNOPQRSTUVWXYZ
set c=AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz
for /l %%a in (1 1 %~2) do (
    set/ai=!random!%%26,j=!random!%%52
    if "%~3" equ "1" (
        for %%i in (!i!) do set s=!s!!a:~%%i,1!
    ) else if "%~3" equ "2" (
        for %%i in (!i!) do set s=!s!!b:~%%i,1!
    ) else (
        for %%i in (!j!) do set s=!s!!c:~%%i,1!
    )
)
endlocal&set "%~1=%s%"&goto :eof
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