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Magic numbers become particularly confusing when the same number is used for different purposes in one section of code. It is easier to alter the value of the number, as it is not duplicated. Changing the value of a magic number is error-prone, because the same value is often used several times in different places within a program. [6]
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 ...
Magic number (programming) Time formatting and storage bugs, for problems that can be caused by magics; Sentinel value (aka flag value, trip value, rogue value, signal value, dummy data) Canary value, special value to detect buffer overflows; Video games cheat codes which have the same origin; XYZZY (command)
%!PS-Adobe-3.0 ESPF-3.0: 0 eps epsf Encapsulated PostScript file version 3.0 [34] 25 21 50 53 2D 41 64 6F 62 65 2D 33 2E 31 20 45 50 53 46 2D 33 2E 30 %!PS-Adobe-3.1 ESPF-3.0: 0 eps epsf Encapsulated PostScript file version 3.1 [35] 49 54 53 46 03 00 00 00 60 00 00 00: ITSF␃␀␀␀`␀␀␀ 0 chm MS Windows HtmlHelp Data: 3F 5F?_ 0 hlp ...
The shebang is actually a human-readable instance of a magic number in the executable file, the magic byte string being 0x23 0x21, the two-character encoding in ASCII of #!. This magic number is detected by the "exec" family of functions, which determine whether a file is a script or an executable binary. The presence of the shebang will result ...
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.
In the context of computer programming, magic is an informal term for abstraction; it is used to describe code that handles complex tasks while hiding that complexity to present a simple interface. The term is somewhat tongue-in-cheek , and often carries bad connotations, implying that the true behavior of the code is not immediately apparent.
Integer overflow can be demonstrated through an odometer overflowing, a mechanical version of the phenomenon. All digits are set to the maximum 9 and the next increment of the white digit causes a cascade of carry-over additions setting all digits to 0, but there is no higher digit (1,000,000s digit) to change to a 1, so the counter resets to zero.