From: Brian Candler <b.candler@...>
Date: 2008-11-01T00:35:07+09:00
Subject: Re: Ruby Mastermind Game

Lloyd Linklater wrote:
> Well, you know how to get the random number, so that is easy enough. 
> You just store the last guess and if the new guess is closer to correct 
> than the last one, you are warmer.  Continue until they get it right. 
> Going to 10k should be guessed in no more than 14 tries.

I think he was asking about the Mastermind program.

However it's pretty much the same:

- make a 4-digit random number between 0000 and 9999
- in a loop:
  - ask for a guess
  - finish if the guess is completely right
  - count how many digits are correct and in the right place
  - count how many digits are correct but in the wrong place
  - print the counts

You have a choice of ways to store the correct number. For example it 
could be a 4-digit string: "1234". Then str[0,1] will extract the first 
character, and str[3,1] will extract the last character, so you can 
iterate easily enough to compare the characters.

You may find it easier to create a 4-element Array where each element is 
an integer from 0 to 9. This is easy to manipulate. However the guess 
that the user enters has to be converted into this form too.

I suggest you code it as far as you can, and put comments in (or dummy 
method calls) for the bits where you are stuck.
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