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more about forth
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5 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Forth \Forth\, v.[AS. for[eth], fr for akin to D. voort, G. fort [root]78. See {Fore}, {For}, and cf {Afford}, {Further}, adv.] 1. Forward; onward in time, place or order in advance from a given point; on to end as from that day forth; one two three and so forth. Lucas was Paul's companion, at the leastway from the sixteenth of the Acts forth. --Tyndale. From this time forth, I never will speak word --Shak. I repeated the Ave Maria; the inquisitor bad me say forth; I said I was taught no more --Strype. 2. Out as from a state of concealment, retirement, confinement, nondevelopment, or the like out into notice or view; as the plants in spring put forth leaves. When winter past, and summer scarce begun, Invites them forth to labor in the sun. --Dryden. 3. Beyond a (certain) boundary; away abroad; out I have no mind of feasting forth to-night. --Shak. 4. Throughly; from beginning to end [Obs.] --Shak. {And so forth}, {Back and forth}, {From forth}. See under {And}, {Back}, and {From}. {Forth of}, {Forth from}, out of [Obs.] --Shak. {To bring forth}. See under {Bring}. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Forth \Forth\, prep. Forth from out of [Archaic] Some forth their cabins peep. --Donne. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Forth \Forth\, n. [OE., a ford. ? 78. See {Frith}.] A way a passage or ford. [Obs.] --Todd. From WordNet r 1.6 [wn]: forth adv 1: from a particular thing or place or position; "ran away from the lion"; " wanted to get away from there"; "sent the children away to boarding school"; "the teacher waved the children away from the dead animal"; "went off to school"; "they drove off"; (`forth' is obsolete as in "go forth and preach") [syn: {away}, {off}] 2: forward in time or order or degree; "from that time forth"; "from the sixth century onward" [syn: {forward}, {onward}] 3: out into view; "came forth from the crowd"; "put my ideas forth" From The Free On-line Dictionary of Computing (13 Mar 01) [foldoc]: FORTH 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 {deschedule}d 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 {MMU}s. 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. {FAQs (http://www.complang.tuwien.ac.at/forth/faq/faq-general-2.html)}. {ANS Forth standard, dpANS6 (http://www.taygeta.com/forth/dpans.html)}. FORTH Interest Group Box 1105, San Carlos CA 94070. See also {51forth}, {F68K}, {cforth}, {E-Forth}, {FORML}, {TILE Forth}. [Leo Brodie "Starting Forth"]. [Leo Brodie "Thinking Forth"]. [Jack Woehr "Forth, the New Model"]. [R.G. Loeliger "Threaded Interpretive Languages"]. 2. {FOundation for Research and Technology - Hellas}. (1997-04-16)
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