From: Jeremy Tregunna <jtregunna@...>
Date: 2005-09-20T09:54:53+09:00
Subject: Re: ruby idiom for python's for/else while/else


On 19-Sep-05, at 7:15 PM, Gergely Kontra wrote:

> Hi!
>
> Is there a similar construct to python's:
>
>>>> for n in range(2, 10):
> ...     for x in range(2, n):
> ...         if n % x == 0:
> ...             print n, 'equals', x, '*', n/x
> ...             break
> ...     else:
> ...         # loop fell through without finding a factor
> ...         print n, 'is a prime number'
> ...
> 2 is a prime number
> 3 is a prime number
> 4 equals 2 * 2
> 5 is a prime number
> 6 equals 2 * 3
> 7 is a prime number
> 8 equals 2 * 4
> 9 equals 3 * 3

Directly, yes; though hardly anybody writes code this way (at least 
I've never seen anybody write something like this, like how I'm about 
to give it to you). I'd see William Morgan's message for a better 
suggestion.

for n in (2..10) do
   for x in (2..n) do
     if n % x == 0
       puts "#{n} equals #{x} * #{n/x}"
       break
     else
       puts "#{n} is a prime number"
     end
   end
end

> Gergo

--
Jeremy Tregunna
jtregunna@blurgle.ca

"If debugging is the process of removing bugs, then programming must be 
the process of putting them in." --Dykstra