magic number - définition. Qu'est-ce que magic number
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Qu'est-ce (qui) est magic number - définition

WIKIMEDIA DISAMBIGUATION PAGE
Magic Numbers; Magic numbers; Magic Number; Magic number (disambiguation)

magic number         
<jargon, programming> 1. In source code, some non-obvious constant whose value is significant to the operation of a program and that is inserted inconspicuously in-line (hard-coded), rather than expanded in by a symbol set by a commented "#define". Magic numbers in this sense are bad style. 2. A number that encodes critical information used in an algorithm in some opaque way. The classic examples of these are the numbers used in hash or CRC functions or the coefficients in a linear congruential generator for pseudorandom numbers. This sense actually predates, and was ancestral to, the more common sense 1. 3. Special data located at the beginning of a binary data file to indicate its type to a utility. Under Unix, the system and various applications programs (especially the linker) distinguish between types of executable file by looking for a magic number. Once upon a time, these magic numbers were PDP-11 branch instructions that skipped over header data to the start of executable code; 0407, for example, was octal for "branch 16 bytes relative". Nowadays only a wizard knows the spells to create magic numbers. {MS DOS} executables begin with the magic string "MZ". *The* magic number, on the other hand, is 7+/-2. The paper cited below established the number of distinct items (such as numeric digits) that humans can hold in short-term memory. Among other things, this strongly influenced the interface design of the phone system. ["The magical number seven, plus or minus two: some limits on our capacity for processing information", George Miller, in the "Psychological Review" 63:81-97, 1956]. [Jargon File] (2003-07-02)
Magic number (physics)         
  • Maria Goeppert Mayer
NUMBER OF PROTONS OR NEUTRONS THAT MAKE A NUCLEUS PARTICULARLY STABLE
Doubly magic; Double magic; Magic nucleus; Doubly magic nucleus; Magic number (nuclear physics)
In nuclear physics, a magic number is a number of nucleons (either protons or neutrons, separately) such that they are arranged into complete shells within the atomic nucleus. As a result, atomic nuclei with a 'magic' number of protons or neutrons are much more stable than other nuclei.
Magic number (sports)         
NUMBER USED TO INDICATE PROBABILITY OF WINNING TOURNAMENTS
Elimination number; Tragic number
In certain sports, a magic number is a number used to indicate how close a front-running team is to clinching a division title and/or a playoff spot. It represents the total of additional wins by the front-running team or additional losses (or any combination thereof) by the rival teams after which it is mathematically impossible for the rival teams to capture the title in the remaining number of games (assuming some highly unlikely occurrence such as disqualification or expulsion from the competition or retroactive forfeiture of games does not occur).

Wikipédia

Magic number

Magic number may refer to:

Exemples du corpus de texte pour magic number
1. "It must be over before then." Currently, the magic number for the nomination is 2,026 delegates.
2. "Democrats are getting very close to that magic number of 15," pollster John Zogby said.
3. MAGIC NUMBER "Neither Senator Obama or I will have reached that magic number when the voting ends June 3," Clinton said in Louisville of the number of delegates needed to win the nomination.
4. That‘s the magic number‘‘ required for a population to replace itself.
5. Once McCain reached the magic number of 1,1'1 delegates Tuesday night, Huckabee conceded.