The Happy Number

Chasing Unity

A Happy Number is defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits. If you reach 1, the number is happy. If you loop endlessly in a cycle that does not include 1 (like 4, 16, 37...), it is unhappy.

The Assignment

Your function receives a parameter named num.

1. Use a loop to repeatedly calculate the sum of squares of digits.
2. If the current number becomes 1, print "true" and exit.
3. If the current number becomes 4 (this is a known cycle point for unhappy numbers), print "false" and exit.