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| From | Eric Sosman <esosman@comcast-dot-net.invalid> |
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: How to do Combinations/Permutations in BlueJ |
| Date | Thu, 08 Nov 2012 09:10:03 -0500 |
| Organization | A noiseless patient Spider |
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On 11/7/2012 11:53 PM, lebaz95@gmail.com wrote:
> On Wednesday, November 7, 2012 8:28:19 PM UTC-6, leb...@gmail.com wrote:
>> I would like to create a program that will do problems like (xa+yb)^z. But I would need to do things like (5!/3!(5-3)!) How would I get this done?
>
> rslt = 1;
> for(i = e; i > 0; i --)
> {
> rslt *= i;
> }
>
> I asked my brother and he helped me. e in this program is a user input so you may replace it as you see fit.
A warning: If `e' is greater than 12, this calculation will
produce values too large for an `int':
479001600 = 12!
2147483647 = Integer.MAX_VALUE
6227020800 = 13!
You can go somewhat higher by making `rslt' a `long':
2432902008176640000 = 20!
9223372036854775807 = Long.MAX_VALUE
51090942171709440000 = 21!
... but for anything over 20 even `long' will not suffice. You
should make sure `e' is 20 or smaller (12 or smaller for `int'),
or take a look at the BigInteger class.
--
Eric Sosman
esosman@comcast-dot-net.invalid
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How to do Combinations/Permutations in BlueJ lebaz95@gmail.com - 2012-11-07 18:28 -0800
Re: How to do Combinations/Permutations in BlueJ lebaz95@gmail.com - 2012-11-07 20:53 -0800
Re: How to do Combinations/Permutations in BlueJ markspace <-@.> - 2012-11-07 23:03 -0800
Re: How to do Combinations/Permutations in BlueJ Gene Wirchenko <genew@ocis.net> - 2012-11-08 11:16 -0800
Re: How to do Combinations/Permutations in BlueJ Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-08 09:10 -0500
Re: How to do Combinations/Permutations in BlueJ Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-11-08 10:48 -0500
Re: How to do Combinations/Permutations in BlueJ Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-11-08 13:18 -0500
Re: How to do Combinations/Permutations in BlueJ Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-11-08 23:14 -0500
Re: How to do Combinations/Permutations in BlueJ Arne Vajhøj <arne@vajhoej.dk> - 2012-11-08 15:52 -0500
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