C Questions and Answers
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C Questions and Answers
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Re: C Questions and Answers
#2This reminds me of tests I took in earlier CS classes. Knowing those things are utterly useless in practice.
Re: C Questions and Answers
#3This reminds me of tests I took in earlier CS classes. Knowing those things are utterly useless in practice.
What is your main programming language; in which you do most of the work?
Re: C Questions and Answers
#4Surprisingly accurate, author did his research.
5 is also missing a check for a NULL pointer. ;)
Most of there rules are unfortunately ignored, as obscure information. The worst offender I see in wild code is 5.
The second most ignored is not checking values before computation: 10, 11, 12.
No.7 is very interesting, rarely violated, most programmers don't even know that is a thing or just assume the processor won't trap on an unaligned read.
Re: C Questions and Answers
#5He's discussing subtle points of the C language and yet there is no mention of which compiler he's using, whether the results might be different for different compilers, hardware platforms, and how they correlate with multiple C standards (C89, C99, C11/C1X, etc).
He succeeded in convincing me that he does not know C!
Re: C Questions and Answers
#6He's discussing subtle points of the C language and yet there is no mention of which compiler he's using, whether the results might be different for different compilers, hardware platforms, and how they correlate with multiple C standards (C89, C99, C11/C1X, etc). He succeeded in convincing me that he does not know C!
There is no mention of which compiler he's using or whether the results might be different for different compilers and/or hardware platforms precisely because he's discussing the C language— not the idiosyncrasies of particular implementations.
>and how they correlate with multiple C standards
There's nothing going on here specific to any particular revision of ISO C (that I can see).
Re: C Questions and Answers
#7The only one I got wrong was the one about IEEE semantics. It clearly is possible to know C. :P
Re: C Questions and Answers
#8This reminds me of tests I took in earlier CS classes. Knowing those things are utterly useless in practice.
Compilers are increasingly optimizing out UB, recently fixed a problem where `std::unique_lock` was optimized as it was referenced from an `std::thread` defined at the top of the class. The future is now!
Re: C Questions and Answers
#9Well apparently I do know C. If the author wanted to be as contrived a possible there are certainly more devious edge cases which could have been trotted out. The fact that e.g. the compiler may optimize out a NULL check after you've already dereferenced the darn thing shouldn't be surprising. Just fix your silly bug.
Re: C Questions and Answers
#10Unsigned int >= 0 in a decrementing for-loop is a classic trap