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qsort is a C standard library function that implements a sorting algorithm for arrays of arbitrary objects according to a user-provided comparison function. It is named after the "quicker sort" algorithm [1] (a quicksort variant due to R. S. Scowen), which was originally used to implement it in the Unix C library, although the C standard does not require it to implement quicksort.
Major programming languages, such as C++ (in the GNU and LLVM implementations), use introsort. [30] Quicksort also competes with merge sort, another O(n log n) sorting algorithm. Merge sort's main advantages are that it is a stable sort and has excellent worst-case performance.
The C standard function qsort is an example of this ... The following C code computes an approximation of the integral of an arbitrary function: ... program example ...
C. C (programming language) C dynamic memory allocation; C file input/output; C syntax; C data types; C23 (C standard revision) Callback (computer programming) CIE 1931 color space; Coalesced hashing; Code injection; Comment (computer programming) Composite data type; Conditional (computer programming) Const (computer programming) Constant ...
C program source text is free-form code. Semicolons terminate statements, while curly braces are used to group statements into blocks. The C language also exhibits the following characteristics: The language has a small, fixed number of keywords, including a full set of control flow primitives: if/else, for, do/while, while, and switch.
The International Obfuscated C Code Contest (abbreviated IOCCC) is a computer programming contest for code written in C that is the most creatively obfuscated. Held semi-annually, it is described as "celebrating [C's] syntactical opaqueness". [1] The winning code for the 27th contest, held in 2020, was released in July 2020. [2]
Listings are commonly used in education and computer-related books to show examples of code. In the early days of programming, it was used to hand-check a program and as permanent storage. It was also common in 1970s and 1980s computer enthusiast magazines (for instance Creative Computing) and books like BASIC Computer Games for type-in programs.
Introsort or introspective sort is a hybrid sorting algorithm that provides both fast average performance and (asymptotically) optimal worst-case performance. It begins with quicksort, it switches to heapsort when the recursion depth exceeds a level based on (the logarithm of) the number of elements being sorted and it switches to insertion sort when the number of elements is below some threshold.