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class MontyHall 
  
  def initialize
    @doors = Array.new(3, :goat)
    @doors[rand(3)] = :car
    @chosen_door = rand(3)
    @open_door = rand(3)
    while @open_door == @chosen_door or @doors[@open_door] == :car
      @open_door = rand(3)
 ...

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class MontyHall 
  
  def initialize
    @doors = Array.new(3, :goat)
    @doors[rand(3)] = :car
    @chosen_door = rand(3)
    @open_door = rand(3)
    while @open_door == @chosen_door or @doors[@open_door] == :car
      @open_door = rand(3)
 ...

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class MontyHall 
  
  def initialize
        @doors = Array.new(3, :goat)
        @doors[rand(3)] = :car
        @chosen_door = rand(3)
        @open_door = rand(3)
        while @open_door == @chosen_door or @doors[@open_door] == :car
          @open_door = rand(3)
 ...

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class MontyHall 
  
  def initialize
        @doors = Array.new(3, :goat)
        @doors[rand(3)] = :car
        @chosen_door = rand(3)
        @open_door = rand(3)
        while @open_door == @chosen_door or @doors[@open_door] == :car
          @open_door = rand(3)
 ...

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class MontyHall 
  
  def initialize
        @doors = Array.new(3, :goat)
        @doors[rand(3)] = :car
        @chosen_door = rand(3)
        @open_door = rand(3)
        while @open_door == @chosen_door or @doors[@open_door] == :car
          @open_door = rand(3)
 ...

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class Main
        def show
                print "Main#show\n"
        end
end
 
main = Main.new
main.show
 ...

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class Numeric
  @@currencies = {'dollar' => 1, 'yen' => 0.013, 'euro' => 1.292, 'rupee' => 0.019}
  def method_missing(method_id, *args)
    if method_id == "in" 
      singular_currency = args.to_s.gsub( /s$/, '')
      if @@currencies.has_key?(singular_currency)
        self * @@currencies[singular_currency]
      end
    end   
 ...

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class Numeric
  @@currencies = {'dollar' => 1, 'yen' => 0.013, 'euro' => 1.292, 'rupee' => 0.019}
  def method_missing(method_id)
    singular_currency = method_id.to_s.gsub( /s$/, '')
    if @@currencies.has_key?(from_currency)
      self / @@currencies[from_currency]
    else
      super
 ...

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class Numeric
  @@currencies = {'dollar' => 1, 'yen' => 0.013, 'euro' => 1.292, 'rupee' => 0.019}
  def method_missing(method_id)
    singular_currency = method_id.to_s.gsub( /s$/, '')
    if @@currencies.has_key?(from_currency)
      self / @@currencies[from_currency]
    else
      super
 ...

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1.upto 5 do |x| puts x*x end

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2
 
1.upto 5 do |x| puts x*x end

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2
 
1.to 5 do |x| puts x*x end

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Print Math.log2(8)

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Math.log2(35)

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#Chris Nixon
#Algorithms II
#Fri. Jan. 27th, 2011
#Homework 2
 
class Sort2DMesh
  def initialize
    #creates our initial mesh as an instance variable to be used throughout our class
    @mesh = [[6, 1, 5, 7, 4, 3, 2, 9],[4, 3, 4, 5, 3, 9, 5, 8], [3, 7, 8, 6, 4, 2, 9, 3],[1, 7, 5, 3, 9, 6, 3, 8], [1, 6, 9, 3, 7, 3, 3, 1], [1, 6, 4, 3, 6, 6, 3, 9], [9, 8, 4, 2, 1, 8, 3, 8], [1, 2, 5, 7, 9, 4, 4, 9]]
 ...

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puts ("helloworld")

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def test(a)
 puts "bla bla #{a}"
end
 
test("patate")

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test=gets.to_i
while test>0
        s=gets.chomp
        count=0
        for i in 0...s.length
                if s[i]!='4' && s[i]!='7'
                        count=count+1
                end
                puts s[i]+count.to_s
 ...

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test=gets.to_i
while test>0
        s=gets.chomp
        count=0
        for i in 0...s.length-1
                if s[i]!='4' && s[i]!='7'
                        count=count+1
                end
                puts s[i]+count.to_s
 ...

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test=gets.to_i
while test>0
        s=gets
        count=0
        for i in 0...s.length-1
                if s[i]!='4' && s[i]!='7'
                        count=count+1
                end
                puts s[i]+count.to_s
 ...

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test=gets.to_i
while test>0
        s=gets
        count=0
        for i in 0...s.length-1
                if s[i]!='4' && s[i]!='7'
                        count=count+1
                end
                puts s[i]+count.to_s
 ...

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test=gets.to_i
while test>0
        s=gets
        count=0
        for i in 0..s.length
                if s[i]!='4' && s[i]!='7'
                        count=count+1
                end
                puts s[i]+count.to_s
 ...

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test=gets.to_i
while test>0
        s=gets
        count=0
        for i in 0...s.length
                if s[i]!='4' && s[i]!='7'
                        count=count+1
                end
                puts s[i]+count.to_s
 ...

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test=gets.to_i
while test>0
        s=gets
        count=0
        for i in 0...s.length
                if s[i]!='4' && s[i]!='7'
                        count=count+1
                end
        end
 ...

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class MyArray
  include Enumerable
 
  def each
    i = 0
    loop do
      i += 1
      yield i
    end
 ...

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require 'set'
 
@primes = Set.new([2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67])
 
def is_prime? num
  if num < 2
    return false
  end
  if num <= 67
 ...

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require 'set'
 
@primes = Set.new([2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67])
 
def is_prime? num
  if num < 2
    return false
  end
  if num <= 67
 ...

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while (s=gets.chomp()) != "42" do puts s end

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a = (1..20).map{[]}
 
puts a.to_s
 
a[0] << "foo"
a[-2] << "bar"
 
puts a.to_s

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a = [[]] * 4
 
puts a.to_s
 
a[0] << "foo"
a[-2] << "bar"
 
puts a.to_s