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The time now is 2026-08-01 19:02

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DOS学习入门 & 精彩文章（教学室） » Question

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Floor1　hotdog	Posted 2003-08-05 00:00
中级用户　Posts 78　Credits 411
@echo off choice /c:dem defrag,mem,end if errorlevel 3 goto defrag if errorlevel 2 goto mem if errorlevel 1 goto end Can it be changed to if errorlevel 1 goto defrag if errorlevel 2 goto mem if errorlevel 3 goto end or if errorlevel 3 goto end if errorlevel 2 goto mem if errorlevel 1 goto defrag

Floor2　电吉入侵	Posted 2003-08-05 00:00
初级用户　Posts 377　Credits 1,480
No.

Floor3　hotdog	Posted 2003-08-05 00:00
中级用户　Posts 78　Credits 411

Floor4　sensen	Posted 2003-08-05 00:00
初级用户　Posts 64　Credits 286
if errorlevel 1..... means that if the return value is greater than or equal to 1, it will execute the corresponding code.

Floor5　hotdog	Posted 2003-08-05 00:00
中级用户　Posts 78　Credits 411
How many return values does it have?

Floor6　sensen	Posted 2003-08-05 00:00
初级用户　Posts 64　Credits 286
That depends on what command the previous line of code is.

Floor7　hotdog	Posted 2003-08-05 00:00
中级用户　Posts 78　Credits 411
Could you give an example?

Floor8　sensen	Posted 2003-08-06 00:00
初级用户　Posts 64　Credits 286
FINDCD>NUL ;use FINDCD to look up the drive letter of the first CD-ROM DREADY %CDROM% >NUL ;use DREADY to determine whether %CRDOM% is ready IF ERRORLEVEL 2 FINDCD 2>NUL ;if it is not ready then use FINDCD to look up the drive letter of the second CD-ROM IF ERRORLEVEL 0 IF NOT EXIST %CDROM%\QW\QW.EXE FINDCD 2>NUL;if it is ready but there is no qw.exe then use FINDCD to look up the drive letter of the second CD-ROM DREADY has four values: 0：ready; 1:ready only; 2:not ready; 255:invalid

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