搭配物件導向@@
觀看可讀性高的原始碼請按此

class Stack

  def initialize ary=0, max=0, lvl=0
    @ary = ary
    @max = max
    @lvl = lvl
  end
 
  def add
    if @lvl < @max
      puts "Please input a value for add to the stack!"
      @ary[@lvl] = self.get_value
      @lvl+=1
      puts "Now you have #{@lvl} elements for the array!"
    else
      puts "Stack is full!"
    end
  end
 
  def del
    puts "#{@ary[@lvl-1]} has been removed!"
    @lvl -= 1
    if @lvl <= 0
      puts "You have no element in the array!"
    else
      puts "Now you have #{@lvl} elements in the array!"
    end
  end
 
  def get_value
    return gets.chomp
  end
 
  def list
 
    if @lvl <= 0
      puts "You have no element in the array!"
    else
      for ele in 0 ... @lvl
        puts @ary[ele]
      end
    end
    true
  end

  public :initialize, :add, :del, :list
  protected :get_value
end

puts "Please input a number for the stack max!"
ary = {}
max = gets.chomp.to_i
lvl = 0

stack = Stack.new(ary, max, lvl)

=begin

Actions:
  1. add -- for add elements
  2. del -- for remove elements
  3. list -- for list elements
  4. exit -- end this program
=end


while true
  puts "Please select a action!"
  puts <Actions:
  1. add -- for add elements
  2. del -- for remove elements
  3. list -- for list elements
  4. exit -- end this program
EOF
 
 
  action = gets.chomp
 
  case action
    when "add" ,"1"
      puts "Adding array element!"
      stack.add
    when "del", "2"
      puts "Removing array element!"
      stack.del
    when "list", "3"
      puts "Listing array elements!"
      stack.list
    when "exit", "4"
      puts "Bye~ bye!"
      exit
  end
end

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