Count bits used in int

Question

If you have the binary number 10110 how can I get it to return 5? e.g a number that tells how many bits are used? There are some likewise examples listed below:

Answer 1

You really just want to find the position of the highest bit that is a 1. See this page, under the heading "Finding integer log base 2 of an integer (aka the position of the highest bit set)".