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Need an Alrgorithm
This is an archived, read-only copy of the United-TI subforum , including posts and topic from May 2003 to April 2012. If you would like to discuss any of the topics in this forum, you can visit Cemetech's General Programming subforum. Some of these topics may also be directly-linked to active Cemetech topics. If you are a Cemetech member with a linked United-TI account, you can link United-TI topics here with your current Cemetech topics.

This forum is locked: you cannot post, reply to, or edit topics. General Coding and Design => General Programming
Need an Alrgorithm
United-TI Archives -> General Coding and Design
 
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Newbie


Bandwidth Hog


Joined: 23 Jan 2004
Posts: 2247
Posted: 18 Oct 2009 12:58:08 pm    Post subject:
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


Active Member


Joined: 29 Aug 2008
Posts: 565
Posted: 18 Oct 2009 01:10:18 pm    Post subject:
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


Bandwidth Hog


Joined: 23 Jan 2004
Posts: 2247
Posted: 18 Oct 2009 01:51:44 pm    Post subject:
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


Advanced Newbie


Joined: 19 Apr 2009
Posts: 51
Posted: 18 Oct 2009 01:55:19 pm    Post subject:
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


Bandwidth Hog


Joined: 23 Jan 2004
Posts: 2247
Posted: 18 Oct 2009 02:06:39 pm    Post subject:
PHP, but it would be nice to know something to just works across everything.
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bfr


Member


Joined: 13 Feb 2006
Posts: 108
Posted: 18 Oct 2009 02:19:49 pm    Post subject:
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
Posted: 18 Oct 2009 03:39:52 pm    Post subject:
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


Bandwidth Hog


Joined: 23 Jan 2004
Posts: 2247
Posted: 18 Oct 2009 04:48:12 pm    Post subject:
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


Active Member


Joined: 02 Nov 2008
Posts: 604
Posted: 18 Oct 2009 08:00:12 pm    Post subject:
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


Member


Joined: 20 Feb 2008
Posts: 136
Posted: 18 Oct 2009 10:36:26 pm    Post subject:
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


Bandwidth Hog


Joined: 23 Jan 2004
Posts: 2247
Posted: 19 Oct 2009 11:26:26 am    Post subject:
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


Active Member


Joined: 24 May 2006
Posts: 693
Posted: 20 Oct 2009 01:37:42 am    Post subject:
Redirect the page? Surprised
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FloppusMaximus


Advanced Member


Joined: 22 Aug 2008
Posts: 472
Posted: 21 Oct 2009 08:56:43 pm    Post subject:
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
Posted: 02 Mar 2011 06:35:48 pm    Post subject:
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 Sad

Last edited by Guest on 02 Mar 2011 06:37:29 pm; edited 1 time in total
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