3.3.3: rand() example prints same sequence of numbers

[alexeikm]

I suggest setting rand()'s seed to the system time, as the answers in this page suggest, with an accompanying explanation for why this is needed.

While we're at it, I suggest covering else if statements in section 3.3.1 :)

[beejjorgensen]

Good call. I've checked in some clarifications for srand().

On else and else if, did I just forget to put those in? 😊 Adding now.

Cheers!