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From: fred flintstone <fred@server.invalid>
Newsgroups: comp.lang.c
Subject: Re: obtaining a c value from a perl script
Date: Mon, 1 May 2017 04:18:26 -0700
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On 04/30/2017 08:16 AM, Ben Bacarisse wrote:
> fred flintstone <fred@server.invalid> writes:
>
>> I don my asbestos suit and eye-protecting glasses* to bring up a topic
>> with the gurus of c. I get a particular value from a perl script that
>> I would like to see captured by C.
>
> What do you mean by "captured by C"?  The phrase makes me think you want
> to somehow pass a value from your Perl program to a C function.  Even if
> I'm right about this, the details of what "somehow" means for your
> situation still need to be described.

Sure. end of typical output:

right ascension of moon 10h 3m 55s
right ascension of sun 10h 4m 0s
moon seconds is 36235
sun seconds is 36240
to server is 11 2457987.25953264 2457987.25774584 2457987.25848217
right ascension of moon 10h 3m 57s
right ascension of sun 10h 4m 0s
moon seconds is 36237
sun seconds is 36240
to server is 12 2457987.25953264 2457987.25848217 2457987.25897738
right ascension of moon 10h 3m 59s
right ascension of sun 10h 4m 0s
moon seconds is 36239
sun seconds is 36240
to server is 13 2457987.25953264 2457987.25897738 2457987.25921532
right ascension of moon 10h 4m 0s
right ascension of sun 10h 4m 0s
moon seconds is 36240
sun seconds is 36240
equal, while condition fails at julian day 2457987.25921532
equal seconds is 36240


>
>> It's C right under the hood, so I
>> know it can be done. The relevant value is the ultimate value for
>> julian day:
>>
>> https://github.com/TBlazer66/ephemeris/blob/master/2.pluto.pl
>>
>> It's a C_double float. (terminology yikes) I'd like simply to print
>> out this value in C.
>
> Simply is probably the wrong word here.  Printing floating point values
> in C is indeed simple, but nothing you have posted suggests you have the
> right floating point value in C.
>
> <snip>
>

Let's say I had a value in perl that I knew was a c double. It's a premise.

If the only output of this script were:

say "$equal";

, then I think there is a wide road for C interop.
-- 
fred