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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]
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. However, some file signatures can be recognizable when interpreted as text.
Polydivisible numbers represent a generalization of the following well-known [2] problem in recreational mathematics: Arrange the digits 1 to 9 in order so that the first two digits form a multiple of 2, the first three digits form a multiple of 3, the first four digits form a multiple of 4 etc. and finally the entire number is a multiple of 9.
For example, when testing a program that takes a user's personal details and verifies their credit card number, a developer may decide to add a magic string shortcut whereby entering the unlikely input of "***" as a credit card number would cause the program to automatically proceed as if the card were valid, without spending time verifying it.
However, there are infinitely many rational triangular numbers, rational generalized pentagonal numbers and rational tetrahedral numbers which are also magic constants of rational order. The term magic constant or magic sum is similarly applied to other "magic" figures such as magic stars and magic cubes. Number shapes on a triangular grid ...
Magic number (chemistry), number of atoms or molecules forming an exceptionally stable cluster; Magic number (physics), the number of nucleons that results in completely filled nuclear shells; Magic number (programming), either a unique identifier or a literal with unexplained meaning
“The magic number is your full final salary times the number of years you expect to be retired. For example, if you plan to retire for 20 years and make $80,000 a year, you’ll need about $1.6 ...
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.