中国DOS联盟

@echo off&setlocal enabledelayedexpansion
set str=ababababababababa
echo %str%
:begin
set n=0&set m=0&set "var="
set /a a=%random%%%17+1,b=%random%%%17+1,c=%random%%%17+1
if %a% equ %b% goto begin
if %a% equ %c% goto begin
if %b% equ %c% goto begin
:lp
set /a n+=1
for %%i in (%a% %b% %c%) do if %%i equ %n% set m=1
if %m% equ 0 (
   set var=!var!%str:~,1%
   ) else (
   set "var=!var! "
)
set str=%str:~1%&set m=0
if defined str goto lp
if "!var!"=="                 " pause>nul&goto :eof
echo !var!
set str=!var!&goto begin

@echo off&setlocal enabledelayedexpansion
set str=ababababababababa
echo %str%
:begin
set n=0&set m=0&set x=0&set "var="
:set
set /a a=%random%%%17+1
for %%i in (%code%) do if %%i equ %a% goto set
set /a x+=1&set code=%code% %a%
if %x% lss 3 goto set
:lp
set /a n+=1
for %%i in (%code%) do if %%i equ %n% set m=1
if %m% equ 0 (
   set var=!var!%str:~,1%
   ) else (
   set "var=!var! "
)
set str=%str:~1%&set m=0
if defined str goto lp
if "!var!"=="                 " pause>nul&goto :eof
echo !var!
set str=!var!&goto begin

echo off
set "str=ab "&set m=0
:begin
set /a a=%random%%%60+1
set "var="
:lp
set /a b=%random%%%3
call,set c=%%str:~%b%,1%%
if not "%c%"==" " set /a m+=1
set /a n+=1&set var=%c%%var%
if %n% lss %a% goto lp
echo.%var%
if %m% lss 60 goto begin
pause>nul

@echo off&setlocal enabledelayedexpansion
set "str=ab"&set /a a=%random%%%60+1
:begin
set /a b=%random%%%2
set c=!str:~%b%,1!&set var=%var%!c!
set /a n+=1
if %n% lss %a% goto begin
echo 下面为本次生成的字符串：
echo %var%&set code=%var%
echo 下面输出的字符（不含空格）总数为60个：
set "str="&set n=0
:lp
if !n! lss 60 if defined var (
   set /a b=%random%%%2
   if !b! equ 0 (
      set "b= "
      ) else (
      set b=!var:~,1!&set /a n+=1
   )
   set str=%str%!b!
   set var=%var:~1%
   goto lp
)
echo.%str%
if !n! lss 60 set str=&set var=%code%&goto lp
pause>nul