Add tests with 100,1000...
Solutions with ceil are wrong.
function out = HowManyDigits(in)
out = floor(log10(in))+1;
How to find the position of an element in a vector without using the find function
First N Perfect Squares
Project Euler: Problem 8, Find largest product in a large string of numbers
Generate N equally spaced intervals between -L and L
Area of a disk
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