andalso is the equivalent of && orelse is the equivalent of ||
due to their short-circuiting, they AREN'T functions.
NOT is a function, though.
Lecture says that you can write the above with if then elses but it's considered poor style due to readability.
You can use > < >= <= on reals but you can't combine ints and reals for comparing.
You cannot use the equality ones = and <> on reals. Lecture says that it isn't usually a wise idea to test equality with reals due to precision issues.