This category involves one means by which different programming languages, within program code, control the scope of declarations, have blocks, how such start and end, and are: marked, formed, shown, expressed, indicated, denoted; their span. Some programming languages obey the off-side rule: blocks are shown by their indentation, the whitespace that precedes them. The term was invented and named by Peter J. Landin in "The Next 700 Programming Languages", CACM vol 9 pp 157-165, March 1966: "Any non-whitespace token to the left of the first such token on the previous line is taken to be the start of a new declaration." Off-side Rule language families: ISWIM, an abstract language that introduced the rule in 1966; ABC, Python; Miranda, Haskell, Curry; Occam; Pliant. Alternatives:

The main alternative is paired symbols or keywords. Most programming languages use this means to mark blocks.

C-syntax family: whitespace is ignored. Blocks are marked between curly braces { and }. Advantage: code can be reformatted and neatly indented, even automatically, with no fear of change to block structure. Disadvantage: human readers see indentation easily and quickly and often miss much formal meaning communicated in braces, unless they are very careful.

Pascal family: blocks shown by keywords, start with "begin", end with "end".

LISP family: doesn't differentiate statements from expressions, parentheses are enough.

POSIX shell family: blocks start after each control keyword and end with the keyword written backwards: "case" starts conditional statements, "esac" ends them.

  • Off-side Rule Growing article, with links to many related topics. [Wikipedia]

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Inter CAFFE

40 korisnika prisutno: 3 registrovanih, 1 skrivenih i 36 senkica. Ulogovani: cesko, galeksic, niko650 (01:08)

Bolje te vidim kad sklopim oči - Milan Višnjić
Uto 16.12.2014 8:31, micha@Umetnost
Jedan od cudnijih snova
Pon 15.12.2014 15:58, jeka1983@Sanovnik forum
Iz moje svaštare
Pon 15.12.2014 12:48, micha@Umetnost
Sanjam stalno bivseg momka. Da li to ista znaci?
Sre 10.12.2014 7:59, danielarmd@Sanovnik forum
Muzicki kutak - pjesme za prijatelje
Sre 10.12.2014 0:11, apprivoiser@Umetnost
Poezija - najlepsi stihovi
Sub 06.12.2014 10:32, Wind@Umetnost
Filigranska kapija od stihova - Dejan Milenković
Sub 06.12.2014 1:28, tragalac@Umetnost
Recepti, jela od mesa - rostiljijada
Sub 06.12.2014 0:45, niko650@Životni stil

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