Please Forward: Ruby Quiz Submission

ruby-talk
1

From: "John Baylor" <john.baylor@gmail.com>
Date: June 27, 2006 11:55:52 PM CDT
To: submission@rubyquiz.com
Subject: Please Forward: Ruby Quiz Submission

This is my first hack at a quiz solution - the previous ones have been fun to read and follow; I'm looking forward to the next one (where I won't be quite so late in my answer).

# pp_pascal.rb
# for details, see http://www.rubyquiz.com/quiz84.html

class String
  def center( width )
    return self if self.length >= width
    ret = self
    0.upto(width) do |w|
      ret = ret + ' '
      return ret if ret.length >= width
      ret = ' ' + ret
      return ret if ret.length >= width
    end
    ret
  end
end

class Integer
  def to_centered_s( width )
    ret = (self > 0) ? self.to_s.center(width) : ''
  end
end

rows = ARGV[0].to_i
max = 0
allRows =
prevRow = [0,1,0]
allRows[0] = prevRow
(2..rows).each do |row|
  nextRow =
  (2..prevRow.length).each do |col|
    nextVal = (prevRow[col-2]+prevRow[col-1])
    nextRow << nextVal
  end
  prevRow = [0, nextRow, 0].flatten
  allRows[row-1] = prevRow
end
maxWidth = prevRow[( prevRow.length / 2).to_i].to_s.length
totalWidth = rows * (maxWidth*2)
puts "rows=#{rows}, mw=#{maxWidth}, tw=#{totalWidth}"
allRows.each do |row|
  row = row[1..-2]
  row.collect! { |x| x = x.to_centered_s (maxWidth*2-1) }
  puts row.join(' ').center(totalWidth)
end

Now I can look at the other solutions...

thanks!
JB

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