You can try this in javascript:
A) alert( 1.9 * 50 ); = 95
B) alert( 2.9 * 50 ); = 145
C) alert( 3.9 * 50 ); = 195
D) alert( 4.9 * 50 ); = 245.00000000000 003
E) alert( 5.9 * 50 ); = 295
Why D) = 245.00000000000 003 ?
Thanks,
Maori.
10  1319 
On Feb 8, 4:20*pm, maori wrote:
You can try this in javascript:
A) alert( 1.9 * 50 ); * *= * 95
B) alert( 2.9 * 50 ); * *= * 145
C) alert( 3.9 * 50 ); * *= * 195
D) alert( 4.9 * 50 ); * *= * 245.00000000000 003
E) alert( 5.9 * 50 ); * *= * 295
Why D) *= 245.00000000000 003 ?
Javascript's only numeric data type is an IEEE double precision
floating point number. That type of number can represent many numbers
precisely, and others it can only approximate. You have encountered
one of the numbers that can only be approximated.
This should not be an unexpected feature as it is common in systems
for representing numbers. For example, a decimal representation of 1
divided by 3 is unlikely to be precise (because it would be infinitely
long), while the same number can be precisely represented in base 3 as
0.1.
And, how can I deal with this in javascript, please?
"Henry" <rc*******@rain drop.co.ukescri bió en el mensaje
news:b9******** *************** ***********@d4g 2000prg.googleg roups.com...
On Feb 8, 4:20 pm, maori wrote:
You can try this in javascript:
A) alert( 1.9 * 50 ); = 95
B) alert( 2.9 * 50 ); = 145
C) alert( 3.9 * 50 ); = 195
D) alert( 4.9 * 50 ); = 245.00000000000 003
E) alert( 5.9 * 50 ); = 295
Why D) = 245.00000000000 003 ?
Javascript's only numeric data type is an IEEE double precision
floating point number. That type of number can represent many numbers
precisely, and others it can only approximate. You have encountered
one of the numbers that can only be approximated.
This should not be an unexpected feature as it is common in systems
for representing numbers. For example, a decimal representation of 1
divided by 3 is unlikely to be precise (because it would be infinitely
long), while the same number can be precisely represented in base 3 as
0.1.
timothytoe wrote on 08 feb 2008 in comp.lang.javas cript:
What you found did not surprise me. I've seen that kind of things for
decades. The only system I can remember that didn't have that problem
was the Atari 8-bit, which turned on the binary coded decimal bit in
the 6502 for Atari BASIC.
Central Data Basic for the Signetics/Philips 2650 microprosessor,
rumoured to have been written by a youth called William Gates,
usded BCD as it's standard Math engine.
And there were more:
<http://en.wikipedia.or g/wiki/Binary-coded_decimal>
It is stil used in financial programming, in the code most radio clocks in
Europe receive from the Frankfurt long wave transmitter, and many other
applocations.
--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)
In article <Xn************ ********@194.10 9.133.242>, "Evertjan." <ex************ **@interxnl.net wrote:
>timothytoe wrote on 08 feb 2008 in comp.lang.javas cript:
>What you found did not surprise me. I've seen that kind of things for
decades. The only system I can remember that didn't have that problem
was the Atari 8-bit, which turned on the binary coded decimal bit in
the 6502 for Atari BASIC.
Pfui. IBM mainframes -- System/360 and its descendants (S/370, 309x, 40xx,
etc.) -- have had true decimal arithmetic at the hardware level for more than
forty years.
--
Regards,
Doug Miller (alphageek at milmac dot com)
It's time to throw all their damned tea in the harbor again.
On Feb 8, 4:24 pm, spamb...@milmac .com (Doug Miller) wrote:
In article <Xns9A3EE689DEB 6Aeej...@194.10 9.133.242>, "Evertjan." <exjxw.hannivo. ..@interxnl.net wrote:
timothytoe wrote on 08 feb 2008 in comp.lang.javas cript:
What you found did not surprise me. I've seen that kind of things for
decades. The only system I can remember that didn't have that problem
was the Atari 8-bit, which turned on the binary coded decimal bit in
the 6502 for Atari BASIC.
Pfui. IBM mainframes -- System/360 and its descendants (S/370, 309x, 40xx,
etc.) -- have had true decimal arithmetic at the hardware level for more than
forty years.
--
Regards,
Doug Miller (alphageek at milmac dot com)
It's time to throw all their damned tea in the harbor again.
I didn't say the Atari was the only one. I said it was the only one I
remembered.
In comp.lang.javas cript message <7cede433-bdb0-4fae-b55d-da5d23d3e971@p6
9g2000hsa.googl egroups.com>, Sat, 9 Feb 2008 11:50:46, VK
<sc**********@y ahoo.composted:
>though I would argue with some rounding
ideas in FAQ4_6
The code there is correct but outdated. For more recent code, go via
the first link.
--
(c) John Stockton, nr London, UK. ?@merlyn.demon. co.uk Turnpike v6.05 IE 6.
Web <URL:http://www.merlyn.demo n.co.uk/- FAQish topics, acronyms, & links.
I find MiniTrue useful for viewing/searching/altering files, at a DOS prompt;
free, DOS/Win/UNIX, <URL:http://www.idiotsdelig ht.net/minitrue/unsupported. mk*****@yahoo.c om said the following on 2/11/2008 6:16 PM:
Randy seems to have a low threshold... or he's bored.
Neither.
Is there anyone out there that has escaped him?
Yes. The many that use a little intelligence to solve a problem rather
than wanting someone to spoon feed them.
Said on top for Randy. :-)
That's nice[1].
--
Randy
Chance Favors The Prepared Mind
comp.lang.javas cript FAQ - http://jibbering.com/faq/index.html
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/
Thanks Randy!
On Feb 11, 6:51 pm, Randy Webb <HikksNotAtH... @aol.comwrote:
mk83...@yahoo.c om said the following on 2/11/2008 6:16 PM:
Randy seems to have a low threshold... or he's bored.
Neither.
Is there anyone out there that has escaped him?
Yes. The many that use a little intelligence to solve a problem rather
than wanting someone to spoon feed them.
Said on top for Randy. :-)
That's nice[1].
--
Randy
Chance Favors The Prepared Mind
comp.lang.javas cript FAQ -http://jibbering.com/faq/index.html
Javascript Best Practices -http://www.JavascriptT oolbox.com/bestpractic
What is it about comp.lang.javas cript that makes people behave as if
they were in 2nd grade? We should add a "Why do people act childishly
in clj?" to the FAQ.
How old are you people?
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