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Что (кто) такое ALGOL - определение
![CHARA interferometer]] in the near-infrared H-band, sorted according to orbital phase. Because some phases are poorly covered, Aa2 jumps at some points along its path.](https://commons.wikimedia.org/wiki/Special:FilePath/Algol AB movie imaged with the CHARA interferometer - labeled.gif?width=200 "CHARA interferometer]] in the near-infrared H-band, sorted according to orbital phase. Because some phases are poorly covered, Aa2 jumps at some points along its path.")
![Light curve of the Algol recorded by NASA's [[Transiting Exoplanet Survey Satellite]] (TESS).](https://commons.wikimedia.org/wiki/Special:FilePath/Algol TESS lightcurve.png?width=200 "Light curve of the Algol recorded by NASA's [[Transiting Exoplanet Survey Satellite]] (TESS).")
![Family tree of the Algol, [[Fortran]] and [[COBOL]] programming language dynasty](https://commons.wikimedia.org/wiki/Special:FilePath/Algol&Fortran family-by-Borkowski.svg?width=200 "Family tree of the Algol, [[Fortran]] and [[COBOL]] programming language dynasty")
ALGOL (; short for "Algorithmic Language") is a family of imperative computer programming languages originally developed in 1958. ALGOL heavily influenced many other languages and was the standard method for algorithm description used by the Association for Computing Machinery (ACM) in textbooks and academic sources for more than thirty years.
In the sense that the syntax of most modern languages is "Algol-like", it was arguably more influential than three other high-level programming languages among which it was roughly contemporary: FORTRAN, Lisp, and COBOL. It was designed to avoid some of the perceived problems with FORTRAN and eventually gave rise to many other programming languages, including PL/I, Simula, BCPL, B, Pascal, and C.
ALGOL introduced code blocks and the begin...end pairs for delimiting them. It was also the first language implementing nested function definitions with lexical scope. Moreover, it was the first programming language which gave detailed attention to formal language definition and through the Algol 60 Report introduced Backus–Naur form, a principal formal grammar notation for language design.
There were three major specifications, named after the years they were first published:
- ALGOL 58 – originally proposed to be called IAL, for International Algebraic Language.
- ALGOL 60 – first implemented as X1 ALGOL 60 in 1961. Revised 1963.
- ALGOL 68 – introduced new elements including flexible arrays, slices, parallelism, operator identification. Revised 1973.
ALGOL 68 is substantially different from ALGOL 60 and was not well received, so in general "Algol" means ALGOL 60 and its dialects.
Algol , designated Beta Persei (β Persei, abbreviated Beta Per, β Per), known colloquially as the Demon Star, is a bright multiple star in the constellation of Perseus and one of the first non-nova variable stars to be discovered.
Algol is a three-star system, consisting of Beta Persei Aa1, Aa2, and Ab – in which the hot luminous primary β Persei Aa1 and the larger, but cooler and fainter, β Persei Aa2 regularly pass in front of each other, causing eclipses. Thus Algol's magnitude is usually near-constant at 2.1, but regularly dips to 3.4 every 2.86 days during the roughly 10-hour-long partial eclipses. The secondary eclipse when the brighter primary star occults the fainter secondary is very shallow and can only be detected photoelectrically.
Algol gives its name to its class of eclipsing variable, known as Algol variables.
 underway off the coast of Southern California on 22 September 1944.jpg?width=200)
Википедия
Algol , designated Beta Persei (β Persei, abbreviated Beta Per, β Per), known colloquially as the Demon Star, is a bright multiple star in the constellation of Perseus and one of the first non-nova variable stars to be discovered.
Algol is a three-star system, consisting of Beta Persei Aa1, Aa2, and Ab – in which the hot luminous primary β Persei Aa1 and the larger, but cooler and fainter, β Persei Aa2 regularly pass in front of each other, causing eclipses. Thus Algol's magnitude is usually near-constant at 2.1, but regularly dips to 3.4 every 2.86 days during the roughly 10-hour-long partial eclipses. The secondary eclipse when the brighter primary star occults the fainter secondary is very shallow and can only be detected photoelectrically.
Algol gives its name to its class of eclipsing variable, known as Algol variables.
