From: Bertram Scharpf <lists@...>
Date: 2009-12-17T01:03:18+09:00
Subject: Re: a program error

Hi,

Am Mittwoch, 16. Dez 2009, 16:38:07 +0900 schrieb Teodor Carstea:
> hi, all! my compiler doesn't like the "minus" in line 21, it's like:
> 
> /home/cristi/NetBeansProjects/RubyApplication3/lib/helic.rb:21:
> undefined method `-' for "":String (NoMethodError)
> 
> [...]
> 20      x=xspeed*time
> 21      y=yspeed*time-4.9*time**2
> [...]

Put something like this before line 21 and the cause of the error
is obvious:

  puts [ xspeed, yspeed, time].inspect

Bertram


-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
*
Discover String#notempty? at <http://raa.ruby-lang.org/project/step>.