Collatz Conjecture in Scala
Calculate the number of steps to reach 1 using the Collatz conjecture
exercism fetch scala collatz-conjecture
The Collatz Conjecture or 3x+1 problem can be summarized as follows:
Take any positive integer n. If n is even, divide n by 2 to get n / 2. If n is odd, multiply n by 3 and add 1 to get 3n + 1. Repeat the process indefinitely. The conjecture states that no matter which number you start with, you will always reach 1 eventually.
Given a number n, return the number of steps required to reach 1.
Starting with n = 12, the steps would be as follows:
Resulting in 9 steps. So for input n = 12, the return value would be 9.
The Scala exercises assume an SBT project scheme. The exercise solution source should be placed within the exercise directory/src/main/scala. The exercise unit tests can be found within the exercise directory/src/test/scala.
To run the tests simply run the command
sbt test in the exercise directory.
For more detailed info about the Scala track see the help page.
An unsolved problem in mathematics named after mathematician Lothar Collatz see more at collatz conjecture wikipedia
Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.