forth 音標拼音: [f'ɔrθ]
ad . 向前方,向前
向前方,向前
forth adv 1 :
from a particular thing or place or position (`
forth '
is obsolete ); "
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 "; "
go forth and preach " [
synonym : {
away }, {
off }, {
forth }]
2 :
forward in time or order or degree ; "
from that time forth ";
"
from the sixth century onward " [
synonym : {
forth }, {
forward },
{
onward }]
3 :
out into view ; "
came forth from the crowd "; "
put my ideas forth "
n 1 :
a river in southern Scotland that flows eastward to the Firth of Forth [
synonym : {
Forth }, {
Forth River }]
Forth \
Forth \,
prep .
Forth from ;
out of . [
Archaic ]
[
1913 Webster ]
Some forth their cabins peep . --
Donne .
[
1913 Webster ]
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 .
[
1913 Webster ]
Lucas was Paul '
s companion ,
at the leastway from the sixteenth of the Acts forth . --
Tyndale .
[
1913 Webster ]
From this time forth ,
I never will speak word .
--
Shak .
[
1913 Webster ]
I repeated the Ave Maria ;
the inquisitor bad me say forth ;
I said I was taught no more . --
Strype .
[
1913 Webster ]
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 .
[
1913 Webster ]
When winter past ,
and summer scarce begun ,
Invites them forth to labor in the sun . --
Dryden .
[
1913 Webster ]
3 .
Beyond a (
certain )
boundary ;
away ;
abroad ;
out .
[
1913 Webster ]
I have no mind of feasting forth to -
night . --
Shak .
[
1913 Webster ]
4 .
Throughly ;
from beginning to end . [
Obs .] --
Shak .
[
1913 Webster ]
{
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 }.
[
1913 Webster ]
Forth \
Forth \,
n . [
OE .,
a ford . ?
78 .
See {
Frith }.]
A way ;
a passage or ford . [
Obs .] --
Todd .
[
1913 Webster ]
21 Moby Thesaurus words for "
forth ":
ahead ,
alee ,
along ,
away ,
en route to ,
for ,
forward ,
forwards ,
hence ,
off ,
on ,
onward ,
onwards ,
out ,
outward ,
outwardly ,
outwards ,
thence ,
therefrom ,
thereof ,
whence 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 {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 .
FAQs
http ://complang .tuwien .ac .at /forth /faq /faq -general -2 .html )}.
ANS Forth standard , dpANS6
http ://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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