===== Random number ======

==== rand( a ) ====

Returns a random number between 0 and a.

=== Description ===

<code>rand( a )</code>

Returns a random number between 0 (inclusive) and a (exclusive).

=== Parameters ===

| ''a'' | Upper limit for random number |

=== Return value ===

This function returns a random number.

=== Example usage ===

<code>rand(100)</code>