Unfamiliar designations found in a book on computer science

Question

I read this book on computer science, and throughout the book I see several things written like this:

and then this:

and then this:

Which designation is the "Boolean expression" in Example 1 written? I have never seen anything like this before, and I am tempted to assume that the one who wrote and / or scanned this book fell asleep on the keyboard and suggested that this was even true, but what about the third example? I am pretty sure that they do not show C ++ or VB.NET there.

Answer 1

This is definitely the wrong notation. It looks like the wrong latex.

If it is in a printed book, I suggest you check the publisher’s site for errors. If the whole book were like that, I would demand a refund.

If it was a scanned document, I would advise you to go to the bookstore of your local university and ask to see his books second-hand. When a particular edition of a book is no longer used for the course, it is usually sold back to the bookstore and resold for very little.

You can also find enough computer materials on the Internet, for example, on the MIT Open Course Ware website: http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/ and MIT even provides some video lectures : http://www.youtube.com/watch?v=k6U-i4gXkLM

MIT is doing something else to make some of their books readable on the Internet, such as the structure and interpretation of computer programs .

Answer 2

The only thing I understand is a logical diagram and a truth table. This is a representation of the NAND expression. Thus, both inputs must be 0 before output 1.