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  2. Kempner function - Wikipedia

    en.wikipedia.org/wiki/Kempner_function

    In number theory, the Kempner function [1] is defined for a given positive integer to be the smallest number such that divides the factorial!. For example, the number 8 {\displaystyle 8} does not divide 1 ! {\displaystyle 1!} , 2 ! {\displaystyle 2!} , or 3 ! {\displaystyle 3!} , but does divide 4 ! {\displaystyle 4!} , so S ( 8 ) = 4 ...

  3. Unary operation - Wikipedia

    en.wikipedia.org/wiki/Unary_operation

    Common notations are prefix notation (e.g. ¬, −), postfix notation (e.g. factorial n!), functional notation (e.g. sin x or sin(x)), and superscripts (e.g. transpose A T). Other notations exist as well, for example, in the case of the square root, a horizontal bar extending the square root sign over the argument can indicate the extent of the ...

  4. Recursion (computer science) - Wikipedia

    en.wikipedia.org/wiki/Recursion_(computer_science)

    For example, in the factorial function, properly the base case is 0! = 1, while immediately returning 1 for 1! is a short circuit, and may miss 0; this can be mitigated by a wrapper function. The box shows C code to shortcut factorial cases 0 and 1.

  5. Declarative programming - Wikipedia

    en.wikipedia.org/wiki/Declarative_programming

    Declarative programming is a non-imperative style of programming in which programs describe their desired results without explicitly listing commands or steps that must be performed. Functional and logic programming languages are characterized by a declarative programming style.

  6. Drive letter assignment - Wikipedia

    en.wikipedia.org/wiki/Drive_letter_assignment

    MS-DOS command prompt with drive letter C as part of the current working directory. File Manager displaying the contents of drive C.. In computer data storage, drive letter assignment is the process of assigning alphabetical identifiers to volumes.

  7. Path (computing) - Wikipedia

    en.wikipedia.org/wiki/Path_(computing)

    CD "[drive letter]:/Program Files" will only work from the root ([drive letter]:\) directory. This appears to treat all forward slashes the same as .\. [citation needed] exception: Use the /D switch to change current drive in addition to changing current directory for a drive. For example: CD "C:.\Program Files" works the same as CD "C:/Program ...

  8. C file input/output - Wikipedia

    en.wikipedia.org/wiki/C_file_input/output

    The C programming language provides many standard library functions for file input and output.These functions make up the bulk of the C standard library header <stdio.h>. [1] The functionality descends from a "portable I/O package" written by Mike Lesk at Bell Labs in the early 1970s, [2] and officially became part of the Unix operating system in Version 7.

  9. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    Binary Property List file 42 5A 68: BZh: 0 bz2 Compressed file using Bzip2 algorithm 47 49 46 38 37 61 47 49 46 38 39 61: GIF87a GIF89a: 0 gif Image file encoded in the Graphics Interchange Format (GIF) [9] 49 49 2A 00 (little-endian) II*␀ 0 tif tiff Tagged Image File Format (TIFF) [10] 4D 4D 00 2A (big-endian) MM␀* 49 49 2B 00 (little ...