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    Re: Celestial Navigation Software released
    From: Michael Dorl
    Date: 2004 Mar 20, 17:26 -0600
    At 08:24 AM 3/8/04 -0800, you wrote:
    Hi List,

    I'm new to this Navigation-L, and I joined it on the advice of Arthur
    Pearson, who has a very interesting web site about Lunar Distances.
    I have developed and implemented a bunch of algorithms for Celestial
    Navigation, in Java (that runs virtually on any platform), you can take a
    look at http://celestjava.sourceforge.net, it is free and open source, plus
    I wen through the validation smoke test this week-end, ... it seems to work
    fine!

    When I try to run the celest.bat batch file, it loops trying to get input from the user.

    The problem is that my Windows 98 DOS does not have a set /P switch nor does in understand
    the dos if /I switch.

    Below is a segment of the batch file with the set /P command replaced with a choice command
    and the /I switch removed from the if commands.  I also had to rem-out the line that tried to
    reduce the string choice to one character; don't know why, maybe my dos has no substring
    capabilities. It now runs on my dos.  I guess the choice command went away in newer dos
    versions.

    BTW, here's a nice link concerning user batch file input  http://www.robvanderwoude.com/index.html
    It's hard to believe that the original DOS provided no way of getting input from the user.  I vaguely
    remember writing such a command many years ago.

    echo ---------------------------------------
    :: set /P prompts for input and sets the variable
    :: to whatever the user types
    set Choice=Q
    rem set /P not functional in my dos
    rem set /P Choice=Type the letter and press Enter:
    choice /C:ABCDEFGHIJKLQ /N Type the letter and press enter:
    IF ERRORLEVEL 1 SET Choice=A
    IF ERRORLEVEL 2 SET Choice=B
    IF ERRORLEVEL 3 SET Choice=C
    IF ERRORLEVEL 4 SET Choice=D
    IF ERRORLEVEL 5 SET Choice=E
    IF ERRORLEVEL 6 SET Choice=F
    IF ERRORLEVEL 7 SET Choice=G
    IF ERRORLEVEL 8 SET Choice=H
    IF ERRORLEVEL 9 SET Choice=I
    IF ERRORLEVEL 10 SET Choice=J
    IF ERRORLEVEL 11 SET Choice=K
    IF ERRORLEVEL 12 SET Choice=L
    IF ERRORLEVEL 13 SET Choice=Q
    rem
    :: The syntax in the next line extracts the substring
    :: starting at 0 (the beginning) and 1 character long
    rem if NOT '%Choice%'=='' set Choice=%Choice:~0,1%
    echo.
    :: /I makes the if comparison case-insensitive
    if '%Choice%'=='A' goto ItemA
    if '%Choice%'=='B' goto ItemB
    if '%Choice%'=='C' goto ItemC
    if '%Choice%'=='D' goto ItemD
    if '%Choice%'=='E' goto ItemE
    if '%Choice%'=='F' goto ItemF
    if '%Choice%'=='G' goto ItemG
    if '%Choice%'=='H' goto ItemH
    if '%Choice%'=='I' goto ItemI
    if '%Choice%'=='J' goto ItemJ
    if '%Choice%'=='K' goto ItemK
    if '%Choice%'=='L' goto ItemL
    if '%Choice%'=='Q' goto End
       
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