Ruby is fun. A lot of fun. It makes programmers smile. It makes them try crazy things... and those crazy things work.
Thank you
Yukihiro Matsumoto!
Here is a little game I wrote with my kids one Saturday afternoon maybe a year ago.
There is an animal.rb and a zoo.rb and there is myzoo.rb which runs all that. I ran it using
IronRuby.
animal.rb:
class Animal
# create accessor methods for reading these properties
attr_reader :attractiveness, :upkeep, :name, :age, :dies_at, :cost_to_buy, :current_value, :dead
MAX_ATTRACTIVENESS = 100
MAX_UPKEEP = 100
MAX_AGE_WHEN_BUYING = 30
MAX_YEARS_TO_LIVE_AFTER_BUYING = 30
MAX_COST_TO_BUY = 100
ADVERBS = ["Small", "Big", "Smelly", "Cutest", "Sweetest", "Greenish", "Killer", "Harmless", "Angry"]
NOUNS = ["Croc", "Elephant", "Hippo", "Ant", "Bear", "Mollusk", "Octopus", "Snake", "Snail"]
def initialize(name)
@attractiveness = rand(MAX_ATTRACTIVENESS)
@upkeep = rand(MAX_UPKEEP)
@name = name
@age = rand(MAX_AGE_WHEN_BUYING)
@dies_at = @age + rand(MAX_YEARS_TO_LIVE_AFTER_BUYING)
@cost_to_buy = rand(MAX_COST_TO_BUY)
@dead = false
end
def Animal.get
name = ADVERBS[rand(ADVERBS.length)] + " " + NOUNS[rand(NOUNS.length)]
return Animal.new(name)
end
def make_older
return if @dead
if age == @dies_at
@dead = true
puts @name + " died of old age."
else
@age += 1
@attractiveness -= 1
end
end
def show
puts
puts "Name: #{@name}"
puts "Attractiveness: #{@attractiveness.to_s} max: #{MAX_ATTRACTIVENESS.to_s}"
puts "Cost to buy: $#{@cost_to_buy.to_s} max: #{MAX_COST_TO_BUY.to_s}"
puts "Upkeep per year: $#{@upkeep.to_s} max: #{MAX_UPKEEP.to_s}"
puts "Age: #{@age.to_s} year(s). max: #{MAX_AGE_WHEN_BUYING.to_s}"
puts "Dies at: #{@dies_at.to_s} year(s). max: #{(MAX_AGE_WHEN_BUYING + MAX_YEARS_TO_LIVE_AFTER_BUYING).to_s}"
puts
end
end # class Animal
zoo.rb:
class Zoo
# ticket price can be set directly
attr_accessor :ticket_price
# other properties are set internally
attr_reader :overhead_cost, :seed_money, :animals, :upkeep, :year, :animals_bought, :guests, :revenue, :cash
def initialize()
@animals = Array.new
@upkeep = 0
@overhead_cost = 100
@ticket_price = 10
@guests = 0
@revenue = 0
@seed_money = 500
@cash = @seed_money
@year = 0
end
def show
puts
puts "Animals: " + @animals.length.to_s
puts "Upkeep last year: $" + @upkeep.to_s
puts "Overhead cost: $" + @overhead_cost.to_s
puts "Ticket price: $" + @ticket_price.to_s
puts "Revenue last year: $" + @revenue.to_s
puts "Guests last year: " + @guests.to_s
puts "Cash: $" + @cash.to_s
puts "Year: " + @year.to_s
puts
end
# This defines how we buy animals:
def buy_animal(animal)
@cash = @cash - animal.cost_to_buy
puts "You now have: $" + @cash.to_s
@animals.push animal
end
def next_year
@upkeep = 0
@animals.each do |animal|
animal.make_older
end
@animals.delete_if do |animal|
animal.dead
end
@animals.each do |animal|
@upkeep += animal.upkeep
end
@guests = 0
@animals.each do |animal|
@guests += animal.attractiveness
end
@guests = (@guests/Math.sqrt(@ticket_price)).to_i
@revenue = @guests * @ticket_price
@cash += @revenue - @overhead_cost - @upkeep
@year += 1
end
end #class Zoo
myzoo.rb:
require "zoo.rb"
require "animal.rb"
YEARS_TO_PLAY = 10
CREATE_OR_APPEND_MODE = "a+"
WRITE_MODE = "w"
SCORES_FILE = "scores.txt"
def show_hall_of_fame
File.open(SCORES_FILE, CREATE_OR_APPEND_MODE) {}
scores = IO.readlines(SCORES_FILE)
puts "Hall of fame: "
puts "...is waiting for your name" if scores.length == 0
puts scores if scores.length > 0
end
def update_hall_of_fame (cash, player)
File.open(SCORES_FILE, CREATE_OR_APPEND_MODE) {}
scores = IO.readlines(SCORES_FILE)
scores[scores.length] = format("%10.10s %s", cash.to_s, player)
scores.sort!.reverse!
File.open(SCORES_FILE, WRITE_MODE) {|f| f.write(scores) }
end
def show_menu
puts
puts "b = Buy Animals"
puts "s = Sell Animals"
puts "p = Set Ticket Price"
puts "a = Show Animals"
puts "z = Show Zoo"
puts "n = Next Year"
puts "h = Hall of Fame"
puts "q = Quit"
puts
end
puts "Welcome to MyZoo!"
puts "You manage it. Try to make as much money as you can in #{YEARS_TO_PLAY.to_s} years."
print "What's your name boss? "
player = gets
myzoo = Zoo.new
show_hall_of_fame
puts "You have in the bank: $" + myzoo.cash.to_s
playing = true
while playing and myzoo.year <= YEARS_TO_PLAY do
show_menu
print "Enter command:"
command = gets
case command
when "b\n"
some_animal = Animal.get
some_animal.show
print "Do you want to buy this animal? (y/n) "
answer = gets
myzoo.buy_animal(some_animal) if answer == "y\n"
when "s\n"
if myzoo.animals.length > 0
puts "Your salesperson has been eaten by #{myzoo.animals[0].name}."
else
puts "There is no fauna in your zoo."
end
when "p\n"
print "New ticket price: "
answer = gets
if answer.to_i > 0
myzoo.ticket_price = answer.to_i
else
puts "Sorry, no free tickets this year."
end
when "a\n"
if myzoo.animals.length > 0
puts "Your animals: "
myzoo.animals.each do |animal|
animal.show
end
else
puts "Did you buy any? Are they still alive?"
end
when "z\n"
myzoo.show
when "n\n"
myzoo.next_year
myzoo.show
when "h\n"
show_hall_of_fame
when "q\n"
print "Abandoning your enterprise? (y/n)"
answer = gets
if answer == "y\n" then
puts "Good-bye!"
playing = false
end
end
end
update_hall_of_fame(myzoo.cash, player) if myzoo.cash > 0
show_hall_of_fame
