Generate random number in ruby

Ruby program for Generate random number . Here problem description and explanation.

# Ruby program for
# Print random number


class MyNumber 
	# Print random number in given size
	def simple_random(size) 
		number = 0
		i = 0
		r = Random.new
		max_int = (2**(0.size * 8 -2) -1)
		while (i < size) 
			# Get new rand number
			number = r.rand(0...max_int)
			print(number ,"\n")
			i += 1
		end
	end
	def random_between_range(first, last) 
		r = Random.new
		# random number
		number = r.rand(first...last)
		print(number ,"\n")
	end
end
def main() 
	obj = MyNumber.new()
	# Test Case
	obj.simple_random(3)
	# Range from 1 to 10
	obj.random_between_range(1, 10)
	# Range from 50 to 100
	obj.random_between_range(50, 100)
	# Range from 1000 to 2000
	obj.random_between_range(1000, 2000)
end
main()

Output

560019284106442335
3647006435479195124
1434646830460570668
9
81
1383