中国DOS联盟

原帖地址： groups.google.com/group/alt.ms ...

Okay, here is my final bisection thing, but it's now written in only ONE Line. That line is very long, exact 418 visible char long: (if not defined Result ... goto%0 Two things are required: ".BAT" extension, and a variable named Result must be empty. The testing loop, in (2147483647, -33554428, 0), would count down from 2147483647, and stop on 255. If a loop with that same speed for each number you see, it would have calc/found that number after more than four years. In other words: if you run the test loop (take about 4 seconds), and then see a message: 255. "All Done", Press any key ..., then you have displayed the same data as would have taken more than 260 years, So, I would say this loop is fast. Besides that, it shouldn't be a problem for you to rewrite it for whatever, other purpose than exit-codes/errorlevels... Benny @echo off setlocal enabledelayedexpansion (set Result=) for /L %%I in (2147483647, -33554428, 0) do ( call :ErrMake %%I call :ErrFind > nul echo !ErrFind!. REM if "!ErrFind!" neq "%%I" echo OOPS.& exit /b ) endlocal call:_& echo All Done.& pause goto:eof :ErrFind (if "!Result!"=="" set Result=%0&set Result=!Result:~1!&(if not errorlevel 1 set !Result!=0&set Result=&goto:eof)&set H=2147483647&(if errorlevel !H! set !Result!=!H!&set Result=&goto:eof)&set L=0)&set/a A=H/2+L/2&echo H:!H! A:!A! L:!L!&(if errorlevel !A! ((if !L!==!A! set/a A+=1&(if not errorlevel !A! set A=!L!)&set !Result!=!A!&set Result=&goto:eof)&set L=!A!)else set H=!A!)&goto%0 :ErrMake X [norm/both/user] if /i "%~2"=="norm" (set errorlevel=) if /i "%~2"=="both" (set errorlevel=%~1) if /i "%~2"=="user" ( cd.\&(set errorlevel=& if errorlevel 1 exit /b %~1 call:_ echo It is recognizable that a variable errorlevel echo have been manipulated, value is %errorlevel%. echo. echo "%~nx0" is ready to create the exit-code %~1, echo Please make a choice, 1...3: echo. echo 1: As requested, create an ERRORLEVEL %~1 echo. echo 2: Also set the synthetic errorlevel variable echo. echo 3: Normalize/restore the synthetic errorlevel echo so it is following the real DOS ERRORLEVEL echo.& (set /p errorlevel=?: ) if "!errorlevel!"=="3" set errorlevel=&exit /b %~1 if "!errorlevel!"=="2" (set errorlevel=%~1) else ( set errorlevel=%errorlevel%)) ) exit /b %~1 :_ for %%_ in (________________) do (echo %%_%%_%%_%%_%%_)

[ Last edited by electronixtar on 2007-2-23 at 01:46 AM ]

此段代码不是一般的值得学习研究, 有别于本论坛中其他所有代码的,这是代码处理问题方式的一个另类. 看上去好象只是65次循环,其实它的计算次数几乎是爆炸模式递增的, 太不可思议了.我现在在想,本段代码是否是利用了batch的某个特性?? 这让我想起了下面这段代码.啊!我好象有点明白了.......它的计算次数不是几何递增模式的... 我再考虑考虑....... ------------------------------- FT!就是65次!!我被骗了! ---------------------------------. [ Last edited by qjbm on 2007-2-19 at 11:48 PM ]

恩，虽然只有65次，但是代码还是值得研究的。这年头的p处理都比较BT

:ErrFind 段IF嵌套的比较BT.虽看不出有何实际意义,但其嵌套手法值得学习. ---------- 闲聊一下: 近来的论坛这是怎么了?? 满坛尽是灌水帖! 一些朋友发起的问题也让人打不起精神,甚至感觉烦躁...重复..重复..再重复.. 一天来4.5次,盼望出现个值得讨论的话题也找不到.... 我来的时候willsort 就走了,现在3742668 也辞职了. "无奈何" 也见收不见尾.qzwqzw也不知道干什么去了.........

近来的论坛这是怎么了?? 满坛尽是灌水帖! 一些朋友发起的问题也让人打不起精神,甚至感觉烦躁...重复..重复..再重复.. 一天来4.5次,盼望出现个值得讨论的话题也找不到.... 我来的时候willsort 就走了,现在3742668 也辞职了. "无奈何" 也见收不见尾.qzwqzw也不知道干什么去了.........

过节不说这些，呵呵，春节快乐啊。SB终究是SB，不必烦心理会。

　　我不删帖子已经好几天。

尺有所短，寸有所长，学好CMD没商量。 考虑问题复杂化，解决问题简洁化。

呵呵，论坛发展到一定程度了，大量的FAQ是不可避免的。

受了，研究。。。。。。。

我不顶帖子已经好多年……