루비(stu1)

#Ruby is a perfect Object Oriented Programming Language(객체 지향언어)
#(1) Data Encapsulation(캡슐화)
#(2) Data Abstraction(추상화)
#(3) Polymorphism(다향성)
#(4) Inheritance(상속)

class STU
  def initialize(a, b)
    @val1 = a
    @val2 = b
  end

  # <<<< sum function >>>>
  def summation()
    puts @val1 + @val2
  end

  # <<<< multiplication function >>>>
  def multiplication()
    puts @val1 * @val2
  end

  # <<<< divide function >>>>
  # to_f : 소수로 인식
  def divide()
    puts (@val1.to_f / @val2)
  end
end

stu = STU.new(6,5)
stu.summation
stu.multiplication
stu.divide