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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]
Magic Lantern Video file [58] 44 43 4D 01 50 41 33 30 50 41 33 30: DCM␁PA30 PA30: 0 Windows Update Binary Delta Compression file [59] 37 7A BC AF 27 1C: 7z¼¯'␜ 0 7z 7-Zip File Format 1F 8B ␟‹ 0 gz tar.gz GZIP compressed file [60] FD 37 7A 58 5A 00: ý7zXZ␀ 0 xz tar.xz XZ compression utility using LZMA2 compression 04 22 4D 18 ␄"M ...
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 ...
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)
In mathematics a polydivisible number (or magic number) is a number in a given number base with digits abcde... that has the following properties: [1] Its first digit a is not 0. The number formed by its first two digits ab is a multiple of 2. The number formed by its first three digits abc is a multiple of 3.
("decaf bad") is often found in coding as an easily recognized magic number when hex dumping memory. 0xDEFEC8ED: 3741239533 ("defecated") is the magic number for OpenSolaris core dumps. [26] 0xD0D0CACA: 3503344330 ("doo-doo caca") is the uninitialized value of GPIO values on the Nvidia Tegra X1. [citation needed] 0xE011CFD0: 3759263696
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The Quality and Magic Number options help ensure a reliable, loop-free data link. The Magic Number field helps in detecting links that are in a looped-back condition. Until the Magic-Number Configuration Option has been successfully negotiated, the Magic-Number must be transmitted as zero.