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On 7/11/2016 1:56 PM, Eric Douglas wrote:
> On Monday, July 11, 2016 at 12:27:04 PM UTC-4, Martin Gregorie
> wrote:
>> As others have said, use floats or doubles for science and
>> engineering and int, long, BigInteger or BigDecimal for
>> financials.
>
> That seems misleading and tedious. When I first started learning
> Java I learned about primitives, which I would think you'd want to
> use if you can because they're less overhead,
Financial calculation that need book keeping accuracy are typical
not very computing intensive after todays standard.
Just use BigDecimal and forget about the overhead compared to
simple types.
> but only the float and
> double support decimals which seems odd since they both carry the
> warning "This data type should never be used for precise values, such
> as currency."
Some computer hardware and some programming languages allow
a data type that we can call fixed point in a hardware close
format.
Not Java.
> or apparently any values which use normal math. In
> grade school math we're taught .0002 + .0001 = .0003, so I'm not sure
> how it adds up to .00030000000000000003.
Floating point and math does not follow the same rules. Because
something works in math then it does not necessarily work in
floating point.
There are plenty of examples.
An attempt (hopefully a good one):
public class FPFun {
public static void main(String[] args) {
float a = 12345;
float b = 123;
float c = (a - b) * (a - b);
System.out.printf("%10.1f\n", c);
float d = a * a - 2 * a * b + b * b;
System.out.printf("%10.1f\n",d);
}
}
149377280.0
149377296.0
> Oracle even has their own Java based financials software, so I assume
> all numeric references in their programs use BigDecimal?
Likely.
> I'm not
> sure how you add decimal values using primitives which only support
> whole numbers.
You can do some tricks by having an implied number of decimals.
> When I'm writing a program that calls a method of my API and needs to
> give it a numeric value with a decimal it seems like a lot of extra
> overhead to always convert to a String first and pass into a new
> BigDecimal to get the parameter into the method.
If you do double->String->BigDecimal there is no point - you are already
in trouble.
Your program should already have it as either String or BigDecimal. No
double.
Arne
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missing import java.lang.Comparable Roedy Green <inquiry@mindprod.com> - 2016-06-28 21:34 -0700
Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-06-29 05:56 +0000
Re: missing import java.lang.Comparable Roedy Green <inquiry@mindprod.com> - 2016-06-28 23:59 -0700
Re: missing import java.lang.Comparable Matthias Wiehl <mw@kwarg.de> - 2016-06-29 09:52 +0200
Re: missing import java.lang.Comparable Roedy Green <inquiry@mindprod.com> - 2016-06-29 01:16 -0700
Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-06-29 06:38 -0700
Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-30 13:24 +0000
Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-06-30 06:37 -0700
Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-30 10:19 -0400
Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-06-30 07:47 -0700
Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-30 11:17 -0400
Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-30 18:23 +0000
Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-30 15:24 -0400
Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-06-30 12:47 -0700
Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-30 16:38 -0400
Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-30 21:09 +0000
Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-01 06:45 +0000
Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-01 05:03 -0700
Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-03 20:46 +0000
Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-01 15:21 -0700
Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-03 21:10 +0000
Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-04 16:08 -0700
Program proof Mike Amling <mamling@chaff.us> - 2016-07-05 11:23 -0500
Re: Program proof Andreas Leitgeb <avl@logic.at> - 2016-07-05 18:08 +0000
Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-05 17:23 +0000
Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-05 14:28 -0700
Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-07 15:22 +0000
Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-07 11:44 -0400
Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-07 12:57 -0400
Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-07 18:29 +0000
[OT] Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-07 15:48 -0400
Re: [OT] Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-08 08:01 +0000
Re: [OT] Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-08 08:25 -0400
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-08 06:55 -0700
Re: [OT] Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-08 10:16 -0400
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-08 07:35 -0700
Re: [OT] Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-08 18:07 +0000
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-08 12:54 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-08 16:29 -0400
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-08 14:06 -0700
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-08 20:11 -0400
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-15 11:37 -0700
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-15 16:36 -0400
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-15 15:49 -0700
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-15 22:09 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-16 13:04 +0000
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-18 13:08 -0700
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-18 19:56 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-08 20:59 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-09 11:57 +0000
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-09 09:39 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-09 14:43 +0000
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-09 11:15 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-09 09:46 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-09 15:21 +0000
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-09 11:27 -0400
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-15 11:39 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-15 15:38 -0400
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-15 15:52 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-15 19:19 -0400
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-18 13:10 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-18 16:26 -0400
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-18 13:58 -0700
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-18 16:30 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-18 20:24 -0400
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-19 05:14 -0700
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-19 20:22 -0400
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-19 10:31 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-19 16:37 -0400
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-19 14:44 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-19 21:16 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-19 21:54 +0000
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-19 20:17 -0400
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-20 12:01 -0700
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-20 21:28 +0000
Re: [OT] Re: missing import java.lang.Comparable Gene Wirchenko <genew@telus.net> - 2016-07-20 16:14 -0700
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-19 20:18 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-19 21:33 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-19 21:56 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-19 23:47 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-22 23:31 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-23 10:24 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-23 21:26 -0400
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-23 19:23 -0700
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-23 23:08 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-24 10:44 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-24 10:44 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-20 16:04 -0400
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-20 14:51 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-20 22:57 -0400
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-21 11:38 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-21 15:57 -0400
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-21 13:45 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-21 21:00 -0400
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-22 15:28 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-22 19:34 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-22 23:36 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-23 10:25 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-23 10:58 +0000
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-23 09:32 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-22 23:34 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-23 10:25 -0400
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-23 17:04 -0700
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-24 10:46 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-23 21:23 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-24 10:47 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-22 23:40 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-18 20:02 -0400
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-18 20:26 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-18 20:35 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-18 19:59 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-08 23:36 +0000
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-08 20:09 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-09 12:51 +0000
Re: [OT] Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-09 09:15 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-09 14:30 +0000
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-09 09:44 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-09 14:37 +0000
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-09 11:14 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-09 20:09 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-10 01:11 +0000
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-09 21:52 -0400
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-10 10:34 +0000
Re: [OT] Re: missing import java.lang.Comparable Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-08 21:03 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-08 20:32 -0400
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-11 05:30 -0700
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-11 16:26 +0000
Re: [OT] Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-11 13:56 -0400
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-11 10:59 -0700
Re: [OT] Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-11 15:09 -0400
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-11 13:44 -0700
Re: [OT] Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-11 17:21 -0400
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-11 10:56 -0700
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-11 11:49 -0700
Re: [OT] Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-11 21:00 +0000
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-11 22:30 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-11 22:36 -0400
Re: [OT] Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-07-12 11:37 -0700
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-12 13:01 -0700
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-12 20:31 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-11 22:13 -0400
Re: [OT] Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-08 20:18 -0400
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-08 15:14 -0700
Re: [OT] Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-08 17:59 +0000
Re: [OT] Re: missing import java.lang.Comparable Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-08 14:34 -0400
Re: [OT] Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-08 15:18 -0700
Re: [OT] Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-08 23:50 +0000
Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-07 13:18 -0700
Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-07 16:59 -0400
Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-07-08 15:05 -0700
Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-08 19:51 -0400
Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-07 17:07 -0400
Re: missing import java.lang.Comparable Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-30 20:44 +0000
Re: missing import java.lang.Comparable Arne Vajhøj <arne@vajhoej.dk> - 2016-07-07 16:56 -0400
Re: missing import java.lang.Comparable a.laforgia@gmail.com - 2016-06-30 08:32 -0700
Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-06-30 08:59 -0700
Re: missing import java.lang.Comparable a.laforgia@gmail.com - 2016-06-30 09:06 -0700
Re: missing import java.lang.Comparable Eric Douglas <e.d.programmer@gmail.com> - 2016-06-30 09:35 -0700
Re: missing import java.lang.Comparable Lew <lewbloch@gmail.com> - 2016-06-30 11:18 -0700
Re: missing import java.lang.Comparable Andreas Leitgeb <avl@logic.at> - 2016-07-03 20:57 +0000
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