chapter-2b.rb

## Example of an abstract class
## They should be treated as a protocol for their sub classes to implement
## They shouldn't be directly instantiated

class Session

  def initialize(name, time)
    @time = time
    @name = name
  end

  def report
    print "#{@time} minutes on #{@name} = #{calories} calories\n"
  end

end

class RowingSession < Session

  def calories
    @time * 10
  end

end


class ClimbingSession < Session

  def initialize(name, time, program, weight)
    super(name, time)
    @program = program
    @weight = weight
  end

  def calories
    @time * 10
  end
  
end




session_1 = RowingSession.new("Ronnie", 10)
session_1.report

session_2 = ClimbingSession.new("Billy", 5, "Hill Climbing", 70)
session_2.report