From: "Martin Lüdtke" <martin_luedtke@...>
Date: 2007-12-18T04:52:00+09:00
Subject: Re: dividing by two and rounding up

Corey Jewett schrieb:
> 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

(5+1) / 2