From: Corey Jewett <ml@...>
Date: 2007-12-18T03:55:15+09:00
Subject: Re: dividing by two and rounding up


On Dec 17, 2007, at 10:42 , Tom Norian wrote:

> Hey all...I am hoping for a tip
>
> I have a table I want to lay out dynamcially in rails where if a game
> has 6 periods the first 3 periods will be in the first column and the
> 4-6 in the second column.  If someone picks an odd number of periods ,
> say 5, I want the 1-3 in the first column and 4 and 5 in the second.
>
> I have figured out how to iterate through IF I could get 5/2 to  
> yield me
> 3.
>
> How do I divide a number (integer) by 2 and get a result that is like:
>
> 5/2 I want 3
>  6/2 I want 3
> 7/2 I want 4
>
> I'm thinking perhaps I could test for oddness then add one to the  
> result
> if odd, but that seems kinda a lot of lines for something so simple.
>
> half_periods = 0
> if num_periods%2 == 1
>   half_periods = num_periods/2 +1
> else
>   half_periods = num_periods/2
> end

(5/2.0).ceil

Corey