Specifies how many digits in a given integer.
Example: in=100 ==> out=3
Add tests with 100,1000...
Solutions with ceil are wrong.
Find all elements less than 0 or greater than 10 and replace them with NaN
Project Euler: Problem 5, Smallest multiple
Back to basics 1 - Saving
Check if number exists in vector
find the surface area of a cube
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