Integer predicates


puts 0.even?        # => true (Ruby 1.9)
puts 0.odd?         # => false

1.	Integer and Float
2.	An integer with the kind_of? method (this method is from the Object class).
3.	Integer is an instance of the Fixnum class, which inherits the Integer class.
4.	Change x from an integer to a floating point with the to_f method from the Fixnum class
5.	difference between 'puts x / y' and 'puts x.to_f / y.to_f'
6.	to integers, using to_i:
7.	puts 120.chr
8.	Basic Math Operations for integer
9.	List the modules which Integer class is from
10.	General Predicates
11.	Comparison Methods

Integer predicates : Integer « Number « Ruby