имя существительное [география] Форт (река в Шотландии)
1. наречие [литературно-книжное] 1) вперёд, дальше (в пространственном отношении) Синоним(ы): forward 2) впредь, далее (во временном отношении) Например: from that day forth — начиная с того дня Синоним(ы): henceforward, from now on 3) вовне, наружу Синоним(ы): out, outward Например: and so on, and so forth — и так далее so far forth — постольку 2. предлог [устаревшее] 1) из Синоним(ы): from 2) вне, сверх, выше, за Синоним(ы): out of
язык программирования Форт изобретен примерно в 1970 г. Чарльзом Муром (Charles Moore) из Национальной радиоастрономической обсерватории в Аризоне (США). Он же создал процессор NOVIC RISC. Название языка произошло от англ. forth (вперед) или редуцированного fourth (четвертое поколение ЯВУ). Очень компактный, легко расширяемый, общего назначения ЯВУ. Программы на языке Форт записываются в польской инверсной записи и работают со стеком. Широко применялся в управляющих системах, робототехнике, системах сбора данных и программировании игр. Стандарт - Форт-83 Смотри также: 3GL, HLL, Polish notation Например: "I had a Forth language interpreter and compiler, just to play around with" (Linus Torvalds) У меня был интерпретатор языка Форт, просто чтобы поиграть с ним
ФОРТ (язык программирования)
geographical name river 116 miles (187 kilometers) S central Scotland flowing E into Firth of Forth (estuary 48 miles or 77 kilometers long, inlet of North Sea)
I. adverb Etymology: Middle English, from Old English; akin to Old English for 1. onward in time, place, or order; forward Example: from that day forth 2. out into notice or view Example: put forth leaves 3. obsolete away, abroad II. preposition archaic forth from; out of
1. An interactive extensible language using postfix syntax and a data stack, developed by Charles H. Moore in the 1960s. FORTH is highly user-configurable and there are many different implementations, the following description is of a typical default configuration. Forth programs are structured as lists of "words" - FORTH's term which encompasses language keywords, primitives and user-defined subroutines. Forth takes the idea of subroutines to an extreme - nearly everything is a subroutine. A word is any string of characters except the separator which defaults to space. Numbers are treated specially. Words are read one at a time from the input stream and either executed immediately ("interpretive execution") or compiled as part of the definition of a new word. The sequential nature of list execution and the implicit use of the data stack (numbers appearing in the lists are pushed to the stack as they are encountered) imply postfix syntax. Although postfix notation is initially difficult, experienced users find it simple and efficient. Words appearing in executable lists may be "primitives" (simple assembly language operations), names of previously compiled procedures or other special words. A procedure definition is introduced by ":" and ended with ";" and is compiled as it is read. Most Forth dialects include the source language structures BEGIN-AGAIN, BEGIN-WHILE-REPEAT, BEGIN-UNTIL, DO-LOOP, and IF-ELSE-THEN, and others can be added by the user. These are "compiling structures" which may only occur in a procedure definition. FORTH can include in-line assembly language between "CODE" and "ENDCODE" or similar constructs. Forth primitives are written entirely in assembly language, secondaries contain a mixture. In fact code in-lining is the basis of compilation in some implementations. Once assembled, primitives are used exactly like other words. A significant difference in behaviour can arise, however, from the fact that primitives end with a jump to "NEXT", the entry point of some code called the sequencer, whereas non-primitives end with the address of the "EXIT" primitive. The EXIT code includes the scheduler in some multi-tasking systems so a process can be descheduled after executing a non-primitive, but not after a primitive. Forth implementations differ widely. Implementation techniques include threaded code, dedicated Forth processors, macros at various levels, or interpreters written in another language such as C. Some implementations provide real-time response, user-defined data structures, multitasking, floating-point arithmetic, and/or virtual memory. Some Forth systems support virtual memory without specific hardware support like MMUs. However, Forth virtual memory is usually only a sort of extended data space and does not usually support executable code. FORTH does not distinguish between operating system calls and the language. Commands relating to I/O, file systems and virtual memory are part of the same language as the words for arithmetic, memory access, loops, IF statements, and the user's application. Many Forth systems provide user-declared "vocabularies" which allow the same word to have different meanings in different contexts. Within one vocabulary, re-defining a word causes the previous definition to be hidden from the interpreter (and therefore the compiler), but not from previous definitions. FORTH was first used to guide the telescope at NRAO, Kitt Peak. Moore considered it to be a fourth-generation language but his operating system wouldn't let him use six letters in a program name, so FOURTH became FORTH. Versions include fig-FORTH, FORTH 79 and FORTH 83. FORTH Interest Group, Box 1105, San Carlos CA 94070. See also 51forth, F68K, cforth, E-Forth, FORML, TILE Forth. 2. FOundation for Research and Technology - Hellas.