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  2. Magic number (programming) - Wikipedia

    en.wikipedia.org/wiki/Magic_number_(programming)

    The term magic number or magic constant refers to the anti-pattern of using numbers directly in source code. This has been referred to as breaking one of the oldest rules of programming, dating back to the COBOL, FORTRAN and PL/1 manuals of the 1960s. [1] The use of unnamed magic numbers in code obscures the developers' intent in choosing that ...

  3. Fast inverse square root - Wikipedia

    en.wikipedia.org/wiki/Fast_inverse_square_root

    Lighting and reflection calculations, as in the video game OpenArena, use the fast inverse square root code to compute angles of incidence and reflection.. Fast inverse square root, sometimes referred to as Fast InvSqrt() or by the hexadecimal constant 0x5F3759DF, is an algorithm that estimates , the reciprocal (or multiplicative inverse) of the square root of a 32-bit floating-point number in ...

  4. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    List of file signatures. This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbers or Magic Bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.

  5. Bulls and cows - Wikipedia

    en.wikipedia.org/wiki/Bulls_and_Cows

    This software uses "A" to denote "bulls" (digit in the correct position) and "B" to denote "cows" (digit in the wrong position). Bulls and cows (also known as cows and bulls or pigs and bulls) is a code -breaking mind or paper and pencil game for two or more players. The game is played in turns by two opponents who aim to decipher the other's ...

  6. Mastermind (board game) - Wikipedia

    en.wikipedia.org/wiki/Mastermind_(board_game)

    Mastermind (board game) Mastermind. (board game) Mastermind or Master Mind (Hebrew: בול פגיעה, romanized: bul pgi'a) is a code -breaking game for two players invented in Israel. [1][2] It resembles an earlier pencil and paper game called Bulls and Cows that may date back a century.

  7. AB (game) - Wikipedia

    en.wikipedia.org/wiki/AB_(Game)

    AB (game) AB, a variant of the board game Mastermind, is a number guessing game involving two players. The codemaker makes a four-digit number with no repeats, and the codebreaker tries to guess this number in as few moves as possible. When the codebreaker makes a guess, the codemaker says the amount of “A”s, or the correct digits in the ...

  8. Magic string - Wikipedia

    en.wikipedia.org/wiki/Magic_string

    Magic string. Not to be confused with Magic number (programming) or Magic string (therapeutic aid). In computer programming, a magic string is an input that a programmer believes will never come externally and which activates otherwise hidden functionality. A user of this program would likely provide input that gives an expected response in ...

  9. Hexspeak - Wikipedia

    en.wikipedia.org/wiki/Hexspeak

    Hexspeak. Hexspeak is a novelty form of variant English spelling using the hexadecimal digits. Created by programmers as memorable magic numbers, hexspeak words can serve as a clear and unique identifier with which to mark memory or data. Hexadecimal notation represents numbers using the 16 digits 0123456789ABCDEF.