|
ADA 音标拼音: ['edə] n. 女子名 女子名 ADA n 1: an enzyme found in mammals that can catalyze the deamination of adenosine into inosine and ammonia; " ADA deficiency can lead to one form of severe combined immunodeficiency disease"; " the gene encoding ADA was one of the earlier human genes to be isolated and cloned for study" [ synonym: { adenosine deaminase}, { ADA}] (After {Ada Lovelace}) A {Pascal}-descended
language, designed by Jean Ichbiah's team at {CII Honeywell}
in 1979, made mandatory for Department of Defense software
projects by the Pentagon. The original language was
standardised as "Ada 83", the latest is "{Ada 95}".
Ada is a large, complex, {block-structured} language aimed
primarily at {embedded} applications. It has facilities for
{real-time} response, {concurrency}, hardware access and
reliable run-time error handling. In support of large-scale
{software engineering}, it emphasises {strong typing}, {data
abstraction} and {encapsulation}. The type system uses {name
equivalence} and includes both {subtypes} and {derived types}.
Both fixed and {floating-point} numerical types are supported.
{Control flow} is fully bracketed: if-then-elsif-end if,
case-is-when-end case, loop-exit-end loop, goto. Subprogram
parameters are in, out, or inout. Variables imported from
other packages may be hidden or directly visible. Operators
may be {overloaded} and so may {enumeration} literals. There
are user-defined {exceptions} and {exception handlers}.
An Ada program consists of a set of packages encapsulating
data objects and their related operations. A package has a
separately compilable body and interface. Ada permits
{generic packages} and subroutines, possibly parametrised.
Ada support {single inheritance}, using "tagged types" which
are types that can be extended via {inheritance}.
Ada programming places a heavy emphasis on {multitasking}.
Tasks are synchronised by the {rendezvous}, in which a task
waits for one of its subroutines to be executed by another.
The conditional entry makes it possible for a task to test
whether an entry is ready. The selective wait waits for
either of two entries or waits for a limited time.
Ada is often criticised, especially for its size and
complexity, and this is attributed to its having been designed
by committee. In fact, both Ada 83 and Ada 95 were designed
by small design teams to be internally consistent and tightly
integrated. By contrast, two possible competitors, {Fortran
90} and {C} have both become products designed by large and
disparate volunteer committees.
See also {Ada/Ed}, {Toy/Ada}.
{Home of the Brave Ada Programmers
(http://lglwww.epfl.ch/Ada/)}. {Ada FAQs
(http://lglwww.epfl.ch/Ada/FAQ/)} (hypertext), {text only
(ftp://lglftp.epfl.ch/pub/Ada/FAQ)}.
{(http://wuarchive.wustl.edu/languages/ada/)},
{(ftp://ajpo.sei.cmu.edu/)},
{(ftp://stars.rosslyn.unisys.com/pub/ACE_8.0)}.
E-mail: .
{Usenet} newsgroup: {news:comp.lang.ada}.
{An Ada grammar (ftp://primost.cs.wisc.edu/)} including a lex
scanner and yacc parser is available. E-mail:
.
{Another yacc grammar and parser for Ada by Herman Fischer
(ftp://wsmr-simtel20.army.mil/PD2:GRAM2.SRC)}.
An {LR parser} and {pretty-printer} for {Ada} from NASA is
available from the {Ada Software Repository}.
{Adamakegen} generates {makefiles} for {Ada} programs.
["Reference Manual for the Ada Programming Language", ANSI/MIL
STD 1815A, US DoD (Jan 1983)]. Earlier draft versions
appeared in July 1980 and July 1982. ISO 1987.
[{Jargon File}]
(2000-08-12)
Automatic Data AcquisitionsAda, OH -- U. S. village in Ohio Population ( 2000): 5582 Housing Units ( 2000): 1948 Land area ( 2000): 1. 871428 sq. miles ( 4. 846975 sq. km) Water area ( 2000): 0. 000000 sq. miles ( 0. 000000 sq. km) Total area ( 2000): 1. 871428 sq. miles ( 4. 846975 sq. km) FIPS code: 00198 Located within: Ohio ( OH), FIPS 39 Location: 40. 768883 N, 83. 822298 W ZIP Codes ( 1990): 45810 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Ada, OH Ada
Ada, OK -- U. S. city in Oklahoma Population ( 2000): 15691 Housing Units ( 2000): 7472 Land area ( 2000): 15. 701331 sq. miles ( 40. 666259 sq. km) Water area ( 2000): 0. 071505 sq. miles ( 0. 185198 sq. km) Total area ( 2000): 15. 772836 sq. miles ( 40. 851457 sq. km) FIPS code: 00200 Located within: Oklahoma ( OK), FIPS 40 Location: 34. 763661 N, 96. 668214 W ZIP Codes ( 1990): 74820 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Ada, OK Ada
Ada, MN -- U. S. city in Minnesota Population ( 2000): 1657 Housing Units ( 2000): 835 Land area ( 2000): 1. 342312 sq. miles ( 3. 476572 sq. km) Water area ( 2000): 0. 000000 sq. miles ( 0. 000000 sq. km) Total area ( 2000): 1. 342312 sq. miles ( 3. 476572 sq. km) FIPS code: 00172 Located within: Minnesota ( MN), FIPS 27 Location: 47. 298701 N, 96. 515796 W ZIP Codes ( 1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Ada, MN Ada
|
安装中文字典英文字典查询工具!
中文字典英文字典工具:
英文字典中文字典相关资料:
|