method
    
    to_int
  to_int()
  public
  Invokes the child class’s to_i method to convert num to an integer.
1.0.class => Float 1.0.to_int.class => Fixnum 1.0.to_i.class => Fixnum
  to_int()
  public
  Invokes the child class’s to_i method to convert num to an integer.
1.0.class => Float 1.0.to_int.class => Fixnum 1.0.to_i.class => Fixnum