return from main

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  1. #1
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    return from main

    dos prog on windows95 machine


    A return value of 0 from main signals all is fine any other value indicates some sort of error but where do these returns from main go to I know they go to the operating system but where and why because my program/compiler will indicate any errors if there are any.

    thanks for the help.
    learner wanting to be a master.

  2. #2
    Registered User
    Join Date
    Dec 2001
    Posts
    27
    Hi,
    The return from main() running under DOS can be accessed in DOS using "errorlevel" and used with "if" in a DOS bat file.

    myprog.exe
    if errorlevel 4 goto four
    if errorlevel 3 goto three
    and so on

    goto exit

    :four
    echo In four
    goto exit

    :three
    echo In three
    goto exit

    and so on

    :exit

    Note that DOS will 'goto' on any errorlevel larger than the one given so the errorlevels should be checked in desending order.
    Pappy
    You learn something new everyday.

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