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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 ]
In the table below, the column "ISO 8859-1" shows how the file signature appears when interpreted as text in the common ISO 8859-1 encoding, with unprintable characters represented as the control code abbreviation or symbol, or codepage 1252 character where available, or a box otherwise. In some cases the space character is shown as ␠.
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 ...
In many cases, a single hard-coded value, such as an array size, may appear several times within the source code of a program. This would be a magic number. This may commonly cause a program bug if some of the appearances of the value are modified, but not all of them. Such a bug is hard to find and may remain in the program for a long time.
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)
The following Python code outlines a function which will return the initial CRC remainder for a chosen input and polynomial, with either 1 or 0 as the initial padding. Note that this code works with string inputs rather than raw numbers:
("uber (ooba) block") is used as the magic number for the ZFS uberblock. 0x1BADB002: 464367618 ("1 bad boot" [1]) Multiboot header magic number. [2] 0x4B1D: 19229 ("forbid") was a password in some calibration consoles for developers to peer deeper into control registers outside the normal calibration memory range. [citation needed] 0x50FFC001 ...