Re: should c be a subset of c++?

From	glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups	comp.lang.c
Subject	Re: should c be a subset of c++?
Date	2015-11-07 06:39 +0000
Organization	Aioe.org NNTP Server
Message-ID	<n1k6bu$deb$1@speranza.aioe.org> (permalink)
References	(7 earlier) <MPG.30a7098daf4af2fc989c27@news.eternal-september.org> <87twoytxs2.fsf@bsb.me.uk> <563D5931.8000702@verizon.net> <87io5etsl2.fsf@bsb.me.uk> <n1jvg7$obf$1@dont-email.me>

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James Kuyper <jameskuyper@verizon.net> wrote:

(snip)

> OK - I didn't notice either of those examples during my review. I
> consider those calculations to be in basically the same category as
> cos(pi): the value does not depend upon the actual value of pi, but only
> upon the relationship between the way the cos() function is defined and
> pi. So it is indeed what you would consider a "no true Scotsman" situation.

To get closer to C, some languages have trigonometric functions
in degrees.  Without them, if you want to compute, say, sin(30 degrees)
you multiply the angle by pi/180, which depends on the approximation
of pi that you have.

The first thing the sin() function does is argument reduction, 
which includes dividing by some multiple of pi.

If your approximation is different, you don't get exactly sin(30).

It seems that many are against trig. degree functions for some
fundamental reason, unrelated to how useful they might be.

-- glen

Thread

Re: should c be a subset of c++? "J. Clarke" <j.clarke.873638@gmail.com> - 2015-11-06 19:02 -0500
  Re: should c be a subset of c++? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-07 01:15 +0000
    Re: should c be a subset of c++? James Kuyper <jameskuyper@verizon.net> - 2015-11-06 20:51 -0500
      Re: should c be a subset of c++? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-07 03:07 +0000
        Re: should c be a subset of c++? James Kuyper <jameskuyper@verizon.net> - 2015-11-06 23:45 -0500
          Re: should c be a subset of c++? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-07 06:39 +0000
            Re: should c be a subset of c++? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-07 00:45 -0800
              Re: should c be a subset of c++? supercat@casperkitty.com - 2015-11-07 16:37 -0800
                Re: should c be a subset of c++? "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-07 16:45 -0800
                Re: should c be a subset of c++? supercat@casperkitty.com - 2015-11-08 08:14 -0800
                Re: should c be a subset of c++? "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-08 09:42 -0800
                Re: should c be a subset of c++? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-08 21:43 +0000
                Re: should c be a subset of c++? "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-08 13:53 -0800
                Re: should c be a subset of c++? "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-08 13:56 -0800
                Re: should c be a subset of c++? supercat@casperkitty.com - 2015-11-08 14:27 -0800
                Re: should c be a subset of c++? Richard Heathfield <rjh@cpax.org.uk> - 2015-11-08 21:56 +0000
                Re: should c be a subset of c++? David Brown <david.brown@hesbynett.no> - 2015-11-08 23:05 +0100
                Re: should c be a subset of c++? "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-08 14:20 -0800
                Re: should c be a subset of c++? David Brown <david.brown@hesbynett.no> - 2015-11-09 10:10 +0100
                Re: should c be a subset of c++? Geoff <geoff@invalid.invalid> - 2015-11-13 14:25 -0800
                Re: should c be a subset of c++? Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-13 17:32 -0500
                Re: should c be a subset of c++? Geoff <geoff@invalid.invalid> - 2015-11-13 15:38 -0800
                Re: should c be a subset of c++? raltbos@xs4all.nl (Richard Bos) - 2015-11-10 17:01 +0000
                Re: should c be a subset of c++? Richard Heathfield <rjh@cpax.org.uk> - 2015-11-10 17:15 +0000
                Re: should c be a subset of c++? Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-08 17:47 -0500
                Re: should c be a subset of c++? David Brown <david.brown@hesbynett.no> - 2015-11-08 23:04 +0100
                Re: should c be a subset of c++? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-08 14:22 -0800
                Re: should c be a subset of c++? supercat@casperkitty.com - 2015-11-08 14:31 -0800
                Re: should c be a subset of c++? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-08 14:38 -0800
                Re: should c be a subset of c++? Richard Damon <Richard@Damon-Family.org> - 2015-11-08 19:50 -0500
                Re: should c be a subset of c++? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-09 01:36 +0000
                Re: should c be a subset of c++? David Brown <david.brown@hesbynett.no> - 2015-11-09 12:33 +0100
                Re: should c be a subset of c++? raltbos@xs4all.nl (Richard Bos) - 2015-11-10 17:03 +0000
                Re: should c be a subset of c++? Richard Damon <Richard@Damon-Family.org> - 2015-11-08 19:24 -0500
                Re: should c be a subset of c++? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-11-09 01:16 +0000
                Re: should c be a subset of c++? raltbos@xs4all.nl (Richard Bos) - 2015-11-10 17:06 +0000
                Re: should c be a subset of c++? Richard Damon <Richard@Damon-Family.org> - 2015-11-08 14:55 -0500
                Re: should c be a subset of c++? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-08 12:03 -0800
                Re: should c be a subset of c++? Richard Damon <Richard@Damon-Family.org> - 2015-11-08 20:01 -0500
                Re: should c be a subset of c++? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-09 02:31 -0800
                Re: should c be a subset of c++? Richard Damon <Richard@Damon-Family.org> - 2015-11-09 08:19 -0500
                Re: should c be a subset of c++? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-09 08:47 -0800
                Re: should c be a subset of c++? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-09 22:45 +0000
                Re: should c be a subset of c++? Keith Thompson <kst-u@mib.org> - 2015-11-09 14:56 -0800
                Re: should c be a subset of c++? supercat@casperkitty.com - 2015-11-09 15:24 -0800
                Re: should c be a subset of c++? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-09 15:56 -0800
                Re: should c be a subset of c++? Richard Damon <Richard@Damon-Family.org> - 2015-11-09 21:54 -0500
                Re: should c be a subset of c++? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-09 19:07 -0800
                Re: should c be a subset of c++? Richard Damon <Richard@Damon-Family.org> - 2015-11-10 08:37 -0500
                Re: should c be a subset of c++? raltbos@xs4all.nl (Richard Bos) - 2015-11-10 17:07 +0000
                Re: should c be a subset of c++? supercat@casperkitty.com - 2015-11-08 12:35 -0800
                Re: should c be a subset of c++? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-11-08 13:02 -0800
                Re: should c be a subset of c++? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-08 21:40 +0000
                Trig functions and radians supercat@casperkitty.com - 2015-11-08 13:54 -0800
                Re: should c be a subset of c++? Geoff <geoff@invalid.invalid> - 2015-11-13 14:18 -0800
                Re: should c be a subset of c++? supercat@casperkitty.com - 2015-11-13 14:55 -0800
                Re: should c be a subset of c++? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-08 01:02 +0000
                Re: should c be a subset of c++? Richard Damon <Richard@Damon-Family.org> - 2015-11-07 20:39 -0500

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