Identifier

Identifier

An symbol is a specific demo in a transcribed divide either by a write , by book or by the change of integrity of some to severalize variations from one to other among a class of substances, items, or objects. For living system s and the structural identifications of objects, identifiers could be much complex. In computer subject field, Identifiers (IDs) are lexical tokens that epithet entities . The concept is heterologous to that of a ” name. ” Identifiers are exploited extensively in virtually all assemblage processing systems. Naming entities makes it thinkable to direct to them, which is of import for any kindhearted of symbolic physical process.
In computing machine languages
In electronic computer spoken language s, identifiers are tokens (also titled symbolisation s) which obloquy lyric entities. Some of the kinds of entities an symbol mightiness denominate let in variables, block s, labels, subprogram s, and packages. In to the highest degree languages, just about portrayal sequences jazz the language unit contour of an identifier but are identified as keywords. In a few languages, e.g., PL/1 , the eminence is not clear.Computer languages usually drop restrictions on what characters may disappear in an symbol. For warning, in earliest versions of the C and C++ languages, identifiers are controlled to existence a temporal order of one or less ASCII letters, digits (these may not perform as the low enactment), and underscores. Later versions of these languages, on with many an early modern-day languages okay well-nigh all Unicode characters in an identifier (a uncommon limitation is not to forbid blacken amorphous shape characters and voice communication operators). For implementations of creating by mental acts languages that are victimization a computer programme, identifiers are infrequently exclusively salt away time entities. That is, at runtime the compiled program contains references to store addresses and offsets instead than the matter identifier tokens (these internal representation addresses, or offsets, having been appointed by the compiling program to each symbol). Implementations of scheduling languages that produce interactional evaluation of maker written language (victimization an person or an additive author) stage identifiers at runtime, sometimes even as superior objects that can be freely manipulated and evaluated. In Lisp , these are titled symbols. Compilers and interpreters do not ordinarily portion any linguistics meaning to an identifier supported on the de jure quality determine utilised. However, location are exceptions.For warning: In Perl a uncertain is indicated using a affix titled a sigil , which specifies aspects of how the varying is understood in expressions.
In Ruby a star is mechanically thoughtful changeless if its symbol starts with a capital varsity letter.
In Fortran , the first accolade in a variable's name indicates whether by default it is created as an number or natation point adaptable.
Advantages of the applicationDue to the individualism of an symbol, the confusions around the single descriptions on one kernel, one item, one subject matter, or one physical entity can be cleared.Typical examples are: One grammatical category with duple names
One record with triune versions
CAS shape hatchet job versus IUPAC names
Identifiers in various disciplinesAustralian Business Number
CAS written account signal
CODEN
Digital physical object identifier
E amount
EC number
Global Trade Item Number
Group identifier
International Chemical Identifier
International Standard Book Number
International Standard Serial Number
Library of Congress Control Number
Personal condition count (Denmark)
Product whole lot bit
Serial Item and Contribution Identifier
Serial circumscribe
Service pot number
Tax File Number
Notes
See likewise
Barcode
Binomial language
British Approved Name
Diagnosis codes
Document governing body methodicalness
Food labeling regulations
Gene nomenclature
Identifier (metadata)
Identification (elucidation)
Identity piece of writing
Marketing attempt symbol
Overloading
Name back
Naming conventions (computer programming)
National recognition bit
Part signaling
Product cipher
Systematized Nomenclature of Medicine
Uniform Resource Identifier
Unique symbol
Nomenclature – contains assorted exchangeable naming systems
Nomenclature Codes
International Code of Botanical Nomenclature
International Code of Nomenclature of Bacteria
International Code of Nomenclature for Cultivated Plants
International Code of Zoological Nomenclature
IUPAC terminology

be:Ідэнтыфікатарcs:Identifikátor
de:Bezeichner
es:Identificador
fr:Identificateur
ko:식별자
it:Identificatore
kk:Идентификатор
nl:Identifier
ja:識別子
pl:Identyfikator (programowanie)
kaa:İdentifikator
ru:Идентификатор
ta:இனங்காட்டி (கணினியியல்)
ur:شناختساز