@echo off&setlocal enabledelayedexpansion
set "codes=a b c d e f g h i j k l m n o p q r s t u v w x y z"
for %%a in (%codes%) do set /a n+=1&set "_!n!=%%a"
set /p input=请输入1-26内的任意数值：
:lp
set /a _random=%random%%%26+1,a=_random-input
if "%a:-=%" lss "2" goto lp
if %_random% lss %input% (set temp=%input%&set input=%_random%&set _random=!temp!)
set /a a=input+1,b=_random-1
set /p=!_%input%!至!_%_random%!间的字母是：<nul
for /l %%a in (%a%,1,%b%) do (set /p=!_%%a!<nul)
pause>nul
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@echo off&setlocal enabledelayedexpansion
set str=abcdefghijklmnopqrstuvwxyz
set /p inp="[1-26] : "
set /a ran=%random%%%25+1
if %ran% equ %inp% set /a ran=26
if %ran% gtr %inp% set /a i=ran,ran=inp,inp=i
set /a ran-=1,inp-=ran
set str=!str:~%ran%,%inp%!
if "%str:~1,-1%"=="" (set ecx=空) else (set ecx=%str:~1,-1%)
echo,%str:~0,1% 与 %str:~-1% 之间的符号为 %ecx%
pause
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