| 单词 | ada | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 | ADAA·daA0074800 (ā′də)ADAAda(ˈeɪdə)ADA
AdaAda(ā`ə), city (1990 pop. 15,820), seat of Pontotoc co., S central Okla.; inc. 1904. It is a large cattle market and the center of a rich oil and ranch area. The city is also noted for horsebreeding, especially of quarter horses. East Central State Univ. and the Sciences and Natural Resources Center of Oklahoma are there, and the Robert S. Kerr Water Research Center (a federal laboratory) is just to the south.Ada:see programming languageprogramming language,syntax, grammar, and symbols or words used to give instructions to a computer. Development of Low-Level Languages All computers operate by following machine language programs, a long sequence of instructions called machine code that is ..... Click the link for more information. . Ada[′ā·də]ADAAmericans with Disabilities Act (ADA)AdaAda(language)Ada is a large, complex, block-structured language aimedprimarily at embedded applications. It has facilities forreal-time response, concurrency, hardware access andreliable run-time error handling. In support of large-scalesoftware 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. Subprogramparameters are in, out, or inout. Variables imported fromother packages may be hidden or directly visible. Operatorsmay be overloaded and so may enumeration literals. Thereare user-defined exceptions and exception handlers. An Ada program consists of a set of packages encapsulatingdata objects and their related operations. A package has aseparately compilable body and interface. Ada permitsgeneric packages and subroutines, possibly parametrised. Ada support single inheritance, using "tagged types" whichare types that can be extended via inheritance. Ada programming places a heavy emphasis on multitasking.Tasks are synchronised by the rendezvous, in which a taskwaits for one of its subroutines to be executed by another.The conditional entry makes it possible for a task to testwhether an entry is ready. The selective wait waits foreither of two entries or waits for a limited time. Ada is often criticised, especially for its size andcomplexity, and this is attributed to its having been designedby committee. In fact, both Ada 83 and Ada 95 were designedby small design teams to be internally consistent and tightlyintegrated. By contrast, two possible competitors, Fortran 90 and C++ have both become products designed by large anddisparate volunteer committees. See also Ada/Ed, Toy/Ada. Home of the Brave Ada Programmers. Ada FAQs (hypertext), text only. 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 including a lexscanner and yacc parser is available. E-mail: Another yacc grammar and parser for Ada by Herman Fischer. An LR parser and pretty-printer for Ada from NASA isavailable from the Ada Software Repository. Adamakegen generates makefiles for Ada programs. ["Reference Manual for the Ada Programming Language", ANSI/MILSTD 1815A, US DoD (Jan 1983)]. Earlier draft versionsappeared in July 1980 and July 1982. ISO 1987. AdaA high-level programming language developed by the U.S. Department of Defense along with the European Economic Community and many other organizations. It was designed for embedded applications and process control but is also used for logistics applications. Ada is a Pascal-based language that is very comprehensive.Named After a Countess Ada was named after Augusta Ada Byron (1815-1852), Countess of Lovelace and daughter of the poet Lord Byron and mathematician Annabella Milbanke Byron. Ada also became a mathematician and was the colleague of Charles Babbage, who was developing his Analytical Engine. Some of her programming notes for the machine have survived, giving her the distinction of being the first documented programmer in the world. The following Ada program converts Fahrenheit to Celsius: with Text_IO; procedure Convert is package Int_IO is new Text_IO.Integer_IO(Integer); Fahrenheit : Integer; begin Text_IO.Put_Line("Enter Fahrenheit"); Int_IO.Get(Fahrenheit); Text_IO.Put("Celsius is "); Int_IO.Put((Fahrenheit-32) * 5 / 9); Text_IO.New_Line; end Convert;ADAADAADAADAADAA gene on chromosome 20q13.12 that encodes adenosine deaminase, which catalyses the hydrolytic de-amination of adenosine and 2-deoxyadenosine, thereby playing a key role in purine metabolism and in adenosine homeostasis. ADA modulates signalling by extracellular adenosine, indirectly contributing to cellular signalling events. It upregulates T-cell activity by binding DPP4 and promotes lymphocyte-epithelial cell adhesion.ADAADAAdenosine deaminase (ADA)ADAADAADAAmericans with Disabilities ActADASee Americans with Disabilities Act.ADA
ADA
Synonyms for ADA
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