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USLorenzo Donati
 

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  1. USLorenzo Donati
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    <p><br/></p> <ul> <li>Former research and teaching assistant.</li> <li>Former SW developer in a research institution.</li> <li>Currently teacher in a technical high-school. </li> </ul> <p><br/></p> <hr> <p>Before you ask a question...: <br></p> <ul> <li><a href="http://www.whathaveyoutried.com" rel="nofollow">What Have You Tried?</a> </li> <li><a href="http://xyproblem.info/" rel="nofollow">The XY problem</a></li> </ul> <p>If you enjoy Electronics: <br></p> <ul> <li><a href="http://www.eevblog.com/" rel="nofollow">EEVblog website</a> </li> <li><a href="http://www.youtube.com/user/EEVblog/videos" rel="nofollow">EEVblog YouTube channel</a></li> <li><a href="http://sound.westhost.com/articles.htm" rel="nofollow">ESP articles</a></li> </ul> <hr> <p>Should one of my students read this... <img src="http://i.stack.imgur.com/WCxBw.gif" alt="enter image description here"></p> <p>Yes, I know you can get help <img src="http://i.stack.imgur.com/w1WNX.gif" alt="enter image description here"> for your homework from the Internet <img src="http://i.stack.imgur.com/bKZLz.gif" alt="enter image description here">, but I usually get you ... sooner or later. <img src="http://i.stack.imgur.com/eqdlk.gif" alt="enter image description here"> <br/></p> <p>Once a former student of mine managed to smuggle a smartphone in the classroom during a written test <img src="http://i.stack.imgur.com/phpTH.gif" alt="enter image description here">. After reading his test <img src="http://i.stack.imgur.com/eXUCS.gif" alt="enter image description here"> it took me about 5 minutes to find the exact URL of the crap <img src="http://i.stack.imgur.com/0MARg.gif" alt="enter image description here"><img src="http://i.stack.imgur.com/QBQtI.gif" alt="enter image description here"> he put on his sheet (20+ years-old pre-standard C++ code with non-standard includes). <img src="http://i.stack.imgur.com/lBJNq.gif" alt="enter image description here"> <br/></p> <p><strong>Remember :</strong> Internet is full of free stuff ... and <strong>crappy stuff is particularly free</strong> <img src="http://i.stack.imgur.com/NPq5V.gif" alt="enter image description here">. Thus choose wisely what you are "borrowing" <img src="http://i.stack.imgur.com/SUx9M.gif" alt="enter image description here">. <br/><br/></p> <p>Of course feel free to <strong><em>learn</em></strong> from what you find on StackOverflow (and other StackExchange network sites)! You could manage to outsmart me and get better grades! <img src="http://i.stack.imgur.com/DsUvy.gif" alt="enter image description here"></p> <p>Happy Coding (or SW/HW Hacking)! <img src="http://i.stack.imgur.com/IZ1Vx.gif" alt="enter image description here"></p>
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    1. POWhy minus one in "inode->i_ino - 1" of fs/ext2/inode.c?
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      1. POUnspecified, undefined and implementation defined behavior WIKI for C
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      1. POWhy is this program erroneously rejected by three C++ compilers?
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      1. PODo I cast the result of malloc?
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    1. CO@Jens As for your 2nd comment: I'm not completely convinced I said something really wrong. As I stated, this should be a WIKI entry that can be digested also by newbies, and I think what I said was clear. I'll reread the whole thing to see if I can be still clearer without making the wording too heavy on the reader.
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    2. CO@Jens thanks for your comments! As I said I'm not a super-expert and I wasn't aware of that `register` thing (I never had to write C code where that was needed). In the context where I've cited it I needed a quick and dirty example and that seemed appropriate (as I stated: C is full of pitfalls! :-). I'll try to add something to hint about that in that spot.
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    3. COGreat question! That sentence should gain the first prize for fogginess! I'm not a native English speaker, so I cannot be 100% sure, but my English skills are quite advanced and I'm still puzzled by that word "only". I can't decide to what other terms it refers. *Only* C99 uses latitude? *Only* certain aspects are treated with latitude. GCC does not use latitude *only* for signed `<<`? This latter seems the best interpretation, but then what "certain aspects": possible UBs causes are just a couple, it would have been much simpler to say what GCC currently does and warn about future changes!
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      1. POWhat aspects of signed left shift are undefined with GCC?
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