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Groups > comp.lang.c > #123615

Re: Toy code for currency handling

From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: Toy code for currency handling
Date 2017-11-29 11:03 -0800
Organization None to speak of
Message-ID <lnr2sgykjb.fsf@kst-u.example.com> (permalink)
References (3 earlier) <ov99nf$5uc$1@jstuckle.eternal-september.org> <ovm3di$vgs$1@dont-email.me> <ovmirc$cs7$1@dont-email.me> <lnvahtxai3.fsf@kst-u.example.com> <ovmuqj$cgs$1@dont-email.me>

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Noob <root@127.0.0.1> writes:
> On 29/11/2017 18:25, Keith Thompson wrote:
>> If you're writing something for your own use, say to balance your
>> checkbook, and a 1-cent error on an interest calculation isn't fatal,
>> you probably don't need to worry about it.
>
> I would definitely *not* need 94 digits to balance my checkbook ;-)

If you have an interest-bearing account, and an interest payment
increases your balance by an amount very very close to 0.5 cents,
you might need some large number of digits to determine which way
to round.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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Thread

[computerphile] Why can't floating point do money? luser droog <luser.droog@gmail.com> - 2017-11-22 09:39 -0800
  Re: [computerphile] Why can't floating point do money? "F. Russell" <fr@random.info> - 2017-11-23 13:11 +0000
    Re: [computerphile] Why can't floating point do money? "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-23 05:35 -0800
    Re: [computerphile] Why can't floating point do money? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-11-23 13:47 +0000
    Re: [computerphile] Why can't floating point do money? "F. Russell" <fr@random.info> - 2017-11-23 15:20 +0000
    Re: [computerphile] Why can't floating point do money? Robert Wessel <robertwessel2@yahoo.com> - 2017-11-24 00:53 -0600
      Re: [computerphile] Why can't floating point do money? supercat@casperkitty.com - 2017-11-24 14:16 -0800
        Re: [computerphile] Why can't floating point do money? Robert Wessel <robertwessel2@yahoo.com> - 2017-11-24 23:50 -0600
    Re: [computerphile] Why can't floating point do money? Noob <root@127.0.0.1> - 2017-11-24 09:44 +0100
      Re: [computerphile] Why can't floating point do money? Jerry Stuckle <jstucklex@attglobal.net> - 2017-11-24 09:18 -0500
        Re: [computerphile] Why can't floating point do money? Noob <root@127.0.0.1> - 2017-11-29 11:50 +0100
          Re: Toy code for currency handling Noob <root@127.0.0.1> - 2017-11-29 16:13 +0100
            Re: Toy code for currency handling Noob <root@127.0.0.1> - 2017-11-29 16:53 +0100
            Re: Toy code for currency handling Robert Wessel <robertwessel2@yahoo.com> - 2017-11-29 10:42 -0600
            Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-11-29 09:25 -0800
              Re: Toy code for currency handling Noob <root@127.0.0.1> - 2017-11-29 19:38 +0100
                Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-11-29 11:03 -0800
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-11-29 19:14 +0000
                Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-11-29 11:31 -0800
                Re: Toy code for currency handling Robert Wessel <robertwessel2@yahoo.com> - 2017-12-01 00:04 -0600
                Re: Toy code for currency handling fr314159@gmail.com - 2017-12-01 12:41 -0800
                Re: Toy code for currency handling supercat@casperkitty.com - 2017-12-01 15:24 -0800
                Re: Toy code for currency handling Noob <root@127.0.0.1> - 2017-12-03 18:08 +0100
                Re: Toy code for currency handling fr314159@gmail.com - 2017-12-04 10:06 -0800
                Re: Toy code for currency handling jameskuyper@verizon.net - 2017-12-04 10:19 -0800
                Re: Toy code for currency handling fr314159@gmail.com - 2017-12-04 11:35 -0800
                Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-12-04 11:56 -0800
                Re: Toy code for currency handling Jerry Stuckle <jstucklex@attglobal.net> - 2017-12-04 15:01 -0500
                Re: Toy code for currency handling "Pascal J. Bourguignon" <pjb@informatimago.com> - 2017-12-05 07:14 +0100
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-05 09:18 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-05 11:31 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-05 14:13 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-05 14:39 +0000
                Re: Toy code for currency handling Melzzzzz <Melzzzzz@zzzzz.com> - 2017-12-05 15:00 +0000
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-05 15:19 +0000
                Re: Toy code for currency handling Melzzzzz <mel@zzzzz.com> - 2017-12-05 16:31 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-05 16:07 +0000
                Re: Toy code for currency handling Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-12-06 01:25 +0000
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 02:00 +0000
                Re: Toy code for currency handling Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-12-06 03:04 +0000
                Re: Toy code for currency handling scott@slp53.sl.home (Scott Lurndal) - 2017-12-05 16:14 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-05 17:28 +0100
                Re: Toy code for currency handling supercat@casperkitty.com - 2017-12-05 11:25 -0800
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-05 21:47 +0000
                Re: Toy code for currency handling supercat@casperkitty.com - 2017-12-05 14:13 -0800
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-05 22:40 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-06 00:38 +0100
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-06 00:21 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 02:22 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-06 10:04 +0100
                Re: Toy code for currency handling supercat@casperkitty.com - 2017-12-06 08:31 -0800
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-05 16:25 +0100
                Re: Toy code for currency handling already5chosen@yahoo.com - 2017-12-05 08:33 -0800
                Re: Toy code for currency handling Melzzzzz <Melzzzzz@zzzzz.com> - 2017-12-05 19:09 +0000
                Re: Toy code for currency handling already5chosen@yahoo.com - 2017-12-05 12:27 -0800
                Re: Toy code for currency handling Melzzzzz <Melzzzzz@zzzzz.com> - 2017-12-05 20:40 +0000
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-05 16:42 +0000
                Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-12-05 09:39 -0800
                Re: Toy code for currency handling scott@slp53.sl.home (Scott Lurndal) - 2017-12-05 17:52 +0000
                Re: Toy code for currency handling Ian Collins <ian-news@hotmail.com> - 2017-12-06 07:59 +1300
                Re: Toy code for currency handling Melzzzzz <Melzzzzz@zzzzz.com> - 2017-12-05 19:12 +0000
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-05 21:59 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-06 00:44 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 01:52 +0000
                Re: Toy code for currency handling Ian Collins <ian-news@hotmail.com> - 2017-12-06 19:40 +1300
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 12:03 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-06 10:30 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 11:40 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-06 14:03 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 14:32 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-06 16:25 +0100
                Re: Toy code for currency handling already5chosen@yahoo.com - 2017-12-06 07:47 -0800
                Re: Toy code for currency handling scott@slp53.sl.home (Scott Lurndal) - 2017-12-06 16:06 +0000
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 18:08 +0000
                Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-12-06 11:22 -0800
                Re: Toy code for currency handling supercat@casperkitty.com - 2017-12-06 09:24 -0800
                Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-12-06 11:23 -0800
                Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-12-06 11:18 -0800
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 19:59 +0000
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 20:02 +0000
                Re: Toy code for currency handling Ian Collins <ian-news@hotmail.com> - 2017-12-07 09:39 +1300
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 21:36 +0000
                Re: Toy code for currency handling Ian Collins <ian-news@hotmail.com> - 2017-12-07 11:15 +1300
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 23:36 +0000
                Re: Toy code for currency handling Ian Collins <ian-news@hotmail.com> - 2017-12-07 12:49 +1300
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-06 23:58 +0000
                Re: Toy code for currency handling Ian Collins <ian-news@hotmail.com> - 2017-12-07 13:08 +1300
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-07 01:51 +0000
                Re: Toy code for currency handling Ian Collins <ian-news@hotmail.com> - 2017-12-07 14:54 +1300
                Re: Toy code for currency handling Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2017-12-07 11:27 -0500
                Re: Toy code for currency handling Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2017-12-07 03:38 +0100
                Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-12-06 20:39 -0800
                Re: Toy code for currency handling "Pascal J. Bourguignon" <pjb@informatimago.com> - 2017-12-07 12:45 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-07 12:21 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-07 14:53 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-07 14:31 +0000
                Re: Toy code for currency handling "Pascal J. Bourguignon" <pjb@informatimago.com> - 2017-12-07 15:33 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-07 14:53 +0000
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-07 14:46 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-07 20:28 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-07 20:03 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-07 22:27 +0100
                Re: Toy code for currency handling bartc <bc@freeuk.com> - 2017-12-07 22:45 +0000
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-08 00:39 +0100
                Re: Toy code for currency handling Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-12-07 21:38 +0000
                Re: Toy code for currency handling Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-12-07 15:24 +0000
                Re: Toy code for currency handling supercat@casperkitty.com - 2017-12-07 07:42 -0800
                Re: Toy code for currency handling scott@slp53.sl.home (Scott Lurndal) - 2017-12-07 14:58 +0000
                Re: Toy code for currency handling already5chosen@yahoo.com - 2017-12-06 01:45 -0800
                Re: Toy code for currency handling Jerry Stuckle <jstucklex@attglobal.net> - 2017-12-05 08:38 -0500
                Re: Toy code for currency handling "James R. Kuyper" <jameskuyper@verizon.net> - 2017-12-04 15:16 -0500
                Re: Toy code for currency handling asetofsymbols@gmail.com - 2017-12-05 02:56 -0800
                Re: Toy code for currency handling Keith Thompson <kst-u@mib.org> - 2017-12-04 11:04 -0800
                Re: Toy code for currency handling David Brown <david.brown@hesbynett.no> - 2017-12-05 09:33 +0100
                Re: Toy code for currency handling Jerry Stuckle <jstucklex@attglobal.net> - 2017-12-04 14:56 -0500
                Re: Toy code for currency handling Robert Wessel <robertwessel2@yahoo.com> - 2017-12-04 20:44 -0600
                Re: Toy code for currency handling herrmannsfeldt@gmail.com - 2017-12-06 21:59 -0800
          Re: [computerphile] Why can't floating point do money? Robert Wessel <robertwessel2@yahoo.com> - 2017-11-29 10:51 -0600
          Re: [computerphile] Why can't floating point do money? Jerry Stuckle <jstucklex@attglobal.net> - 2017-11-30 16:18 -0500
            Re: [computerphile] Why can't floating point do money? scott@slp53.sl.home (Scott Lurndal) - 2017-11-30 22:13 +0000
      Re: [computerphile] Why can't floating point do money? Robert Wessel <robertwessel2@yahoo.com> - 2017-11-24 10:19 -0600
        Re: [computerphile] Why can't floating point do money? Spiros Bousbouras <spibou@gmail.com> - 2017-11-24 16:43 +0000
          Re: [computerphile] Why can't floating point do money? "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-11-24 08:53 -0800
          Re: [computerphile] Why can't floating point do money? bert <bert.hutchings@btinternet.com> - 2017-11-24 08:57 -0800
        Re: [computerphile] Why can't floating point do money? bartc <bc@freeuk.com> - 2017-11-24 16:57 +0000
          Re: [computerphile] Why can't floating point do money? Robert Wessel <robertwessel2@yahoo.com> - 2017-11-24 23:35 -0600
            Re: [computerphile] Why can't floating point do money? Melzzzzz <Melzzzzz@zzzzz.com> - 2017-11-25 05:59 +0000
              Re: [computerphile] Why can't floating point do money? supercat@casperkitty.com - 2017-11-27 10:14 -0800
              Re: [computerphile] Why can't floating point do money? Robert Wessel <robertwessel2@yahoo.com> - 2017-11-30 23:56 -0600

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