August 2002
Beginner
1122 pages
22h 1m
English
Content preview from C++: A Dialog Programming with the C++ Standard LibraryBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The Layout of Data in Memory
Now I have a question for you. After we execute the assembly language statement mov ax,[1000] to load the value of i into ax, what's in register ax? Of course; the answer is the value of i, but what is that value? The first byte of i, at location 1000, has the value 41 hexadecimal (abbreviated 41h), and the second byte, at location 1001, has the value 42h. But the value of i is 2 bytes long; is it 4142h or 4241h? These are clearly not the same!
That was a trick question; there's no way for you to deduce the answer with only the information I've given you so far. The answer happens to be 4241h, because that's the way Intel decided to do it; that is, the low part of the value is stored in the byte of RAM where the variable ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.