From: "David A. Black" <dblack@...>
Date: 2009-10-11T02:37:39+09:00
Subject: Re: Trouble with local variables

Hi --

On Sun, 11 Oct 2009, Rodrigo Bermejo wrote:

> Severin Newsom wrote:
>> Hello everyone!
>> I've been coding with Ruby for about three days, and I just ran into my
>> first big snag. I've been working on a quiz, and the first one had
>> questions like this:
>>
>> puts 'How many classes have a taunt kill?'
>> puts 'A - Three'
>> puts 'B - Four'
>> puts 'C - Five'
>> puts 'D - Six'
>> answer = gets.chomp.downcase
>> if (answer == 'd')
>>   score = score + 1
>> else
>> end
>>
>> But it's messy, since I have to repeat the code for every question. (I
>> know, I know, DRY). With this in mind, I began construction on quiz2,
>> and used this as my prototype:
>>
>> def check
>> answer = gets.chomp.downcase
>> if (answer == c_answer)
>>   score = score + 1
>> else
>>   puts 'The correct answer was ' + c_answer + '.'
>> end
>> end
>> puts 'Which is the slowest class?'
>> puts 'A - Pyro'
>> puts 'B - Demoman'
>> puts 'C - Heavy'
>> puts 'D - Soldier'
>> c_answer = 'c'
>> check
>>
>> I understand the problem (mostly), but I'm looking for a workaround.
>> Most of my 'fixes' don't work because of the 'A, B, C, D' system; should
>> that system be changed?
>>
>> Sorry for such a long post, I've just really gotten into this.
>
> read about class variables (or global variables)
> @score

@score is an instance variable, not a class or global variable. I
would definitely encourage everyone to learn about class and global
variables, but they're literally about the last thing I would reach
for in almost any situation. You definitely won't need them here.


David

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