Unfamiliar notation found in a computer science book

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Published on 2011-11-13T09:27:20Z Indexed on 2011/11/13 9:52 UTC
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boolean-expression

I'm reading through this computer science book and throughout the book I see a number of things written like so:

example 1

and then there's this:

example 2

and then this: example 3

What kind of notation is the "Boolean Expression" in example 1 written in? I've never seen anything like it before and I'm tempted to assume that whoever wrote and/or scanned this book in fell asleep at the keyboard, and assuming that it's even valid, what about the 3rd example? I'm pretty sure that's not C++ or VB.NET they're showing there.

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