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Newbie
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Joined: 23 Jan 2004
Posts: 2247
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 Posted: 18 Oct 2009 12:58:08 pm Post subject: |
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Does anyone know of an algorithm to grab the decimal part from division that could work with any language not using any built in commands other than straight arithmetic.
ie: 7 /3 = 2.3333333 and it grab the .33333333 |
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Galandros
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Joined: 29 Aug 2008
Posts: 565
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| Posted: 18 Oct 2009 01:10:18 pm Post subject: |
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Newbie wrote: not using any built in commands other than straight arithmetic.
That can be a challenge.
This seems tricky and I can't find/remember a way right now. I will be thinking on it. I am starting to doubt that exist a way...
Anyway this made me realize how to do a thing... Coding time!
Last edited by Guest on 18 Oct 2009 03:50:15 pm; edited 1 time in total |
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Newbie
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| Posted: 18 Oct 2009 01:51:44 pm Post subject: |
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Galandros wrote: Newbie wrote: other than straight arithmetic.
That can be a challenge.
This seems tricky and I can't find/remember a way right now. I will be thinking on it. I am starting to doubt that exist a way...
Anyway this made me realize how to do a thing... Coding time!
Thanks. Just so it doesn't sound confusing, I want it just using arithmetic. The way you quoted it, it seemed like I was asking for any way other than arithmetic. :biggrin: |
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Builderboy2005
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Joined: 19 Apr 2009
Posts: 51
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| Posted: 18 Oct 2009 01:55:19 pm Post subject: |
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| well, if you are using a language that can cast to an integer, that might be a good way. Like, 7.333 would be cast to 7, and then its simple subtraction to get what you need. It does depend on the language thigh, what are you using? |
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Newbie
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| Posted: 18 Oct 2009 02:06:39 pm Post subject: |
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| PHP, but it would be nice to know something to just works across everything. |
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bfr
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Joined: 13 Feb 2006
Posts: 108
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| Posted: 18 Oct 2009 02:19:49 pm Post subject: |
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Yeah, I was thinking what Builderboy2005 said. I think nearly every programming language should have some sort of floor/cast to integer method built-in. If it for some reason doesn't and you can only add, subtract, multiply, and divide, then you could get your result by calculating 7 mod 3 using only those operations, which equals 1, and then 1/3 is your result.
Last edited by Guest on 18 Oct 2009 02:20:44 pm; edited 1 time in total |
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Weregoose
Authentic INTJ
Super Elite (Last Title)
Joined: 25 Nov 2004
Posts: 3976
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| Posted: 18 Oct 2009 03:39:52 pm Post subject: |
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Here's a funky way that probably wouldn't be very useful in your case: [font="times new roman"]1/2 – arctan(cot(π x))/π
Theoretically, though, this only works for positive numbers that are not integer multiples of 1/2.
But if you have access to int(), floor(), mod(), round(), etc., there are many transformations that will net you fpart().
Last edited by Guest on 18 Oct 2009 03:41:11 pm; edited 1 time in total |
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Newbie
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Joined: 23 Jan 2004
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| Posted: 18 Oct 2009 04:48:12 pm Post subject: |
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Weregoose wrote: Here's a funky way that probably wouldn't be very useful in your case: [font="times new roman"]1/2 – arctan(cot(π x))/π
Theoretically, though, this only works for positive numbers that are not integer multiples of 1/2.
But if you have access to int(), floor(), mod(), round(), etc., there are many transformations that will net you fpart().
haaaaa. :biggrin: Like you and many others said, I'm probably better off just using the built in functions. PHP has round and mod from what I know as well as others probably, but thanks for your help. Didn't realize it would be this complex. Well I guess I sorta did because of how long I was trying to figure out a way with no results.
Thanks everybody. |
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GloryMXE7
Puzzleman 3000
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Joined: 02 Nov 2008
Posts: 604
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| Posted: 18 Oct 2009 08:00:12 pm Post subject: |
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well ypu could transform the fraction to a mixed number and take only the fraction part
ex 7/3 = 2 1/3
1/3 = .333333
but your probably better of with the built in functions though |
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vanchagreen
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Joined: 20 Feb 2008
Posts: 136
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| Posted: 18 Oct 2009 10:36:26 pm Post subject: |
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Going on Glory MXE7's post some pseudo code might be:
Code:
Repeat number<1
number-=1
End Loop
Display number
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Newbie
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| Posted: 19 Oct 2009 11:26:26 am Post subject: |
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Quick question off topic though:
If I have a php page say: home.php and I want it to say home.php?page=1 how would I get ?page=1 in the url the first time some visits the page?
It's easy to have a link that someone can click and it does that, but what can be done the first time someone comes to the page to change the URL to say that? |
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cjgone
Aw3s0m3
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Joined: 24 May 2006
Posts: 693
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| Posted: 20 Oct 2009 01:37:42 am Post subject: |
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Redirect the page?  |
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FloppusMaximus
Advanced Member
Joined: 22 Aug 2008
Posts: 472
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| Posted: 21 Oct 2009 08:56:43 pm Post subject: |
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If home.php is equivalent to home.php?page=1, why does it matter which URL you use?
As to the original question: you're really just asking how to implement the modulus operation. One way:
Code:
a := 1
while x >= a or x <= -a:
a := a * 2
while a > 1:
a := a / 2
if x >= a then x := x - a
if x <= -a then x := x + a
Last edited by Guest on 21 Oct 2009 08:59:21 pm; edited 1 time in total |
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Lego
Advanced Newbie
Joined: 05 Feb 2010
Posts: 58
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| Posted: 02 Mar 2011 06:35:48 pm Post subject: |
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don't know what php does if you write an float into an int, but in c you can do it like that
int x;
float y=7,33333;
x=y; now x = 7
then just to y=y-x so you geht y=0,33333
Edit: Sorry i haven't read the posted date 
Last edited by Guest on 02 Mar 2011 06:37:29 pm; edited 1 time in total |
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General Coding and Design => Calculator Programming
