From: "Dasson, Raghav" <raghav.dasson@...>
Date: 2009-12-16T17:13:51+09:00
Subject: Re: a program error

Try to use 
 speed = gets.to_i  at line 11 and
 angle = gets.to_i at line 13 to resolve this.

Regards,
Raghav

-----Original Message-----
From: teodorcarstea@yahoo.com [mailto:teodorcarstea@yahoo.com] 
Sent: Wednesday, December 16, 2009 1:08 PM
To: ruby-talk ML
Subject: a program error

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)

1  require "init.rb"
2
3  shots = 3
4  time  = 1
5  speed = 0
6  x=y=1
7  while (shots!=0) do
8        #give entry data
9    puts "let's f*ck da su**er!"
10    puts "give speed:"
11    speed = gets
12    puts "give angle:"
13    angle = gets
14        #processing entry data
15    angle=(Math::PI)/180*angle.to_f
16    xspeed=speed*Math.cos(angle)
17    yspeed=speed*Math.sin(angle)
18        #trajectory's loop
19    while (y>0) do
20      x=xspeed*time
21      y=yspeed*time-4.9*time**2
22      time+=0.01
23
24    #puts "x="+x.to_i.to_s+"  y="+y.to_i.to_s
25       screen.fill_rect 0, 0, 640, 480, BGCOLOR
26       screen.draw_circle x, y, 5, SHELLCOLOR
27       screen.flip
28
29    end
30    shots-=1
31    puts "shots remaining"+ shots.to_s
32  end

help, please. thanks!
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