Much more trivial than I intended, but we need to get moving.

This is really a "just do it" rather than a serious assignment,
so that you can be confident that you can make the system work
before you have to do something more serious.

The Collatz sequence starting from any integer N>0 is:

  If N is even,
    divide it by two,
  but if it is odd,
    multiply it by three and add one

Keep on doing that until N is reduced to 1.

For example, starting from 196 we get

  196, 98, 49, 148, 74, 37, 112, 56, 28, 14, 7, 22, 11, 34,
  17, 52, 26, 13, 40, 20, 10, 5, 16, 8, 4, 2, 1

Your assignment -

  In BCPL, write a program that repeatedly
    asks the user to enter a value for N,
    prints the collatz sequence starting from N,
    prints the length of that sequence.

Submit your code and a few sample runs.



P.S.
  The idea of this sequence is not even nearly as old as I thought.
  It was invented in the 1930's.