From: Joseph Schiller <tendingcows@...>
Date: 2007-03-10T09:20:26+09:00
Subject: Re: "Goto line" function?

Hi,

Fortunately the "goto" has been deprecated. It always results in spaghetti code.  Check out 'case' control structure instead.  You may want to think through the program flow so that you have each possibility and a default case for unanticipated situation. You will need to wrap your code inside the case structure. It's mo' better solution  than coding ad hoc.

i = 3
case i
when 1, 2..5
print "1..5\n"
when 6..10
print "6..10\n"
end

Regards,

Joe

----- Original Message ----
From: Paul van Delst <Paul.vanDelst@noaa.gov>
To: ruby-talk ML <ruby-talk@ruby-lang.org>
Sent: Friday, March 9, 2007 6:40:05 PM
Subject: Re: "Goto line" function?

Helgitomas Gislason wrote:
> Ok, I've read through the forum but I haven't got my answer. If a value
> in my program is true, I want my program to go back to a line like this:
> 
> (Example of the program)
> 
> 1.  puts ' '
> 2.  puts ' '
> 3.  puts '****************************'
> 4.  puts '** (Rules of the program) **'
> 5.  puts '****************************'
> 6.  puts ' '
> 7.  puts 'Ohh, hello there! What are you named many names?'
> 8.
> 9.  names = gets.chomp
> 10.
> 11. if names == '2'
> 12.   puts ' '
> 13.   puts 'Are you named two names?'
> 14.   puts ' '
> 15.   answer = gets.chomp
> 16.   if answer == 'yes'
> 17.     (the program continues)
> 18.
> 19. BUT if answer == 'no'
> 20.       goto.line.7 (And skip the rules, just restart it and begin
> from line 7.)
> 
> What is the command? I know it's not "goto.line.X" but what is it? "back
> to line.X"? "goto.lineX"? What is the command?

Addressing just the loop/goto issue, how about summat like:

#!/usr/bin/env ruby
done=false
until done
   puts ' '
   puts ' '
   puts '****************************'
   puts '** (Rules of the program) **'
   puts '****************************'
   puts ' '
   puts 'Ohh, hello there! What are you named many names?'
   names = gets.chomp
   if names == '2'
     puts ' '
     puts 'Are you named two names?'
     puts ' '
     answer = gets.chomp
     done = true if answer == 'yes'
   end
end
#This is where "the program continues"
puts 'the end'


This gives me the output:

lnx:scratch : blah.rb


****************************
** (Rules of the program) **
****************************

Ohh, hello there! What are you named many names?
2

Are you named two names?

no


****************************
** (Rules of the program) **
****************************

Ohh, hello there! What are you named many names?
2

Are you named two names?

yes
the end




cheers,

paulv

-- 
Paul van Delst             Ride lots.
CIMSS @ NOAA/NCEP/EMC               Eddy Merckx



 
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