Hi Ferdeen, I really appreciate the positive feedback, thank you so much!
And well spotted - fixed it :]
Was checking where I commented on the typo and could see a couple more void returns that should also return double. They are towards the top of the post.
Oh jeez - I checked the writing for typos but not the code - thanks again :]
No worries. It doesn't take anything away from such a good post, and I'll look forward to reading more of your work. Cheers.
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