Pending homework questions
All questions
are now due.
20160930

A Collatz sequence starts with an arbitrary positive
integer n. The next number in the sequence is
 3n+1 if n is odd, and
 n/2 if n is even.
A sequence ends when n reaches 1 .

Write a Racket program that
repeatedly asks the user for a starting number and then
displays the resulting Collatz sequence.

Add a way for the user to terminate the program.

Add test functions by using
(require rackunit)
.
< Write a similar program
in Racket.
