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Posted By

Scooter on 01/17/09


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math


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wizard04
umang_nine


Triangular Numbers

 / Published in: PHP
 

URL: http://reusablecode.blogspot.com/2009/01/triangular-numbers.html

Before some troll comes along and criticizes this function, bear in mind that it has legitimate uses. For example, it can be used to solve the handshake problem: how many handshakes if each person in a room full of n+1 total people shakes hands once with each other person?

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  1. <?php
  2.     /*
  3.     Copyright (c) 2009, reusablecode.blogspot.com; some rights reserved.
  4.     
  5.     This work is licensed under the Creative Commons Attribution License. To view
  6.     a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ or
  7.     send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California
  8.     94305, USA.
  9.     */
  10.  
  11.     function triangularNumber($number)
  12.     {
  13.         for($i = 1; $i <= $number; $i++)
  14.         {
  15.             $result += $i;
  16.         }
  17.  
  18.         return $result;
  19.     }
  20. ?>

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