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Quicksort implementation in C?
(1 answer)
What sorting algorithm does qsort use?
(3 answers)
Closed 9 years ago.
Silly question perhaps, but is there any guarantee that the qsort() routine in the C standard library really implements the QuickSort algorithm?
Since there is nothing in the standard that nominates QuickSort specifically, no.
Related
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2 to the power of N in C without pow
(2 answers)
The most efficient way to implement an integer based power function pow(int, int)
(21 answers)
Closed 1 year ago.
I want to do a pretty simple calculation: 2^20, but I don't have the library math.h.
How can I do it in the kernel space?
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How does the compare function in qsort work?
(6 answers)
Closed 3 years ago.
Is there a 'built-in' sort, in which the int (*compar)(const void *, const void*) does not need to be specified? For example, I find that about 99% of the time I'll do either a basic ascending or descending sort and not care about a special comparison case.
Is there the equivalent of an "in-line" function that can be specified here, or is it always necessary to have a standalone function to do this comparison?
I believe that qsort() is the only "build-in" sorting function in C. But if you write C++, std::sort() is also available.
This question already has answers here:
How is the square root function implemented? [closed]
(15 answers)
Closed 8 years ago.
How does sqrt function really work ? Does it go by any logical theorem to get the result.
Is there any way i can access the code of libarary function such as sqrt?
You can download the source code from the libc, which is open source: http://www.gnu.org/software/libc/download.html
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
C equivalent of C++ STL
I am writing a program in C due to memory constraints on an embedded system. I need a std::unordered_set<int> to implement my algorithm. What STL-like libraries exist for C? If there isn't one which implements std::unordered_set<int> then what container can I use as an alternative?
sglib red black tree container seems to provide what I need.
This question already has answers here:
Closed 11 years ago.
Possible Duplicates:
What belongs in an educational tool to demonstrate the unwarranted assumptions people make in C/C++?
In C99, is f()+g() undefined or merely unspecified?
In the statement, "function1() + function2(); "which function will be called first?
The order of evaluation is unspecified.
Read this answer.