ALL meanings of forth
forth
F f - adverb forth away, off, forwards 1
- adverb forth onward in time 1
- adverb forth onward or outward in place or space; forward: to come forth; go forth. 1
- adverb forth onward in time, in order, or in a series: from that day forth. 1
- adverb forth out, as from concealment or inaction; into view or consideration: The author's true point comes forth midway through the book. 1
- adverb forth away, as from a place or country: to journey forth. 1
- preposition forth Archaic. out of; forth from. 1
- noun forth Firth of, an arm of the North Sea, in SE Scotland: estuary of Forth River. 48 miles (77 km) long. 1
- noun forth a river in S central Scotland, flowing E into the Firth of Forth. 116 miles (187 km) long. 1
- noun forth Out from a starting point and forward or into view. 1
- noun Technical meaning of forth 1. (language) 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. 1
- adverb forth When someone goes forth from a place, they leave it. 0
- adverb forth If one thing brings forth another, the first thing produces the second. 0
- adverb forth When someone or something is brought forth, they are brought to a place or moved into a position where people can see them. 0
- adverb forth forward in place, time, order, or degree 0
- adverb forth out, as from concealment, seclusion, or inaction 0
- adverb forth away, as from a place or country 0
- adverb forth and so on; et cetera 0
- preposition forth out of; away from 0
- noun forth a river in S Scotland, flowing generally east to the Firth of Forth. Length: about 104 km (65 miles) 0
- noun forth river in SE Scotland, flowing east into the Firth of Forth: 65 mi (105 km) 0
- noun forth Firth oflong estuary of the Forth, flowing into the North Sea: 51 mi (82 km) 0
- adverb forth forward in place, time, or degree; onward 0
- adverb forth out; esp., out into view, as from hiding 0
- adverb forth abroad 0
- preposition forth out from; out of 0