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Are negative array indexes allowed in C?
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That is correct. From C99 §6.5.2.1/2:
The definition of the subscript
operator [] is that E1[E2] is
identical to (*((E1)+(E2))).
There's no magic. It's a 1-1 equivalence. As always when dereferencing a pointer (*), you need to be sure...
What new capabilities do user-defined literals add to C++?
...ures added "recently" to C and C++:
// C89:
MyComplex z1 = { 1, 2 } ;
// C99: You'll note I is a macro, which can lead
// to very interesting situations...
double complex z1 = 1 + 2*I;
// C++:
std::complex<double> z1(1, 2) ;
// C++11: You'll note that "i" won't ever bother
// you elsewhere
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void in C# generics?
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Jeppe Stig NielsenJeppe Stig Nielsen
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What does the git index contain EXACTLY?
...7fa005ff12ad89437f2fdc80926e21c 0 .gitignore
100644 5529b198e8d14decbe4ad99db3f7fb632de0439d 0 .mailmap
The Racy git problem gives some more details on that structure:
The index is one of the most important data structures in git.
It represents a virtual working tree state by recording list of...
What is the best way to find the users home directory in Java?
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mladzomladzo
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Difference between `set`, `setq`, and `setf` in Common Lisp?
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SouravSourav
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Why is “origin/HEAD” shown when running “git branch -r”?
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robinstrobinst
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In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
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Saransh Singh
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answered Nov 28 '08 at 4:09
Daniel NaabDaniel Naab
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What are the differences between -std=c++11 and -std=gnu++11?
...=gnu++11 as compilation parameter for gcc and clang? Same question with c99 and gnu99 ? I know about C++ and C standards, it's the differences in the parameters that interest me.
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Aggregate / summarize multiple variables per group (e.g. sum, mean)
....122369 -128.122613
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23 2000 12 63.436507 449.794454
24 2001 12 999.472226 922.726589
See ?aggregate, the formula argument and the examples.
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