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Virtual vs Null - What's the difference?

virtual | null |

In computing terms the difference between virtual and null

is that virtual is in C++, a virtual member function of a class while null is the attribute of an entity that has no valid value.

As a verb null is

to nullify; to annul.

virtual

English

(wikipedia virtual)

Alternative forms

* vertual (obsolete) * vertuall (qualifier) * virtuall (obsolete)

Adjective

(-)
  • In effect or essence, if not in fact or reality; imitated, simulated.
    • In fact a defeat on the battlefield, Tet was a virtual victory for the North, owing to its effect on public opinion.
    Virtual addressing allows applications to believe that there is much more physical memory than actually exists.
  • * Fleming
    • A thing has a virtual existence when it has all the conditions necessary to its actual existence.
  • * De Quincey
    • to mask by slight differences in the manners a virtual identity in the substance
  • Having the power of acting or of invisible efficacy without the agency of the material or measurable part; potential.
  • * Francis Bacon
    • Heat and cold have a virtual transition, without communication of substance.
  • * Milton
    • Every kind that lives, / Fomented by his virtual power, and warmed.
  • Nearly, almost. (A relatively recent corruption of meaning, attributed to misuse in advertising and media. )
    • The angry peasants were a virtual army as they attacked the castle.
  • * 2012 , Chelsea 6-0 Wolves [http://www.bbc.co.uk/sport/0/football/19632463]
    • The Chelsea captain was a virtual spectator as he was treated to his side's biggest win for almost two years as Stamford Bridge serenaded him with chants of "there's only one England captain," some 48 hours after he announced his retirement from international football.
  • Simulated in a computer or online.
    • The virtual world of his computer game allowed character interaction.
  • Operating by computer or in cyberspace; not physically present.
    • a virtual''' assistant; a '''virtual personal trainer
  • (computing, object-oriented programming, of a class member) Capable of being overridden with a different implementation in a subclass.
  • (physics) Pertaining to particles in temporary existence due to the Heisenberg uncertainty principle.

    • Synonyms

    * de facto

    Antonyms

    * de jure * legal * real

    Derived terms

    * virtual reality * virtually

    Noun

    (en noun)
  • (computing) In C++, a virtual member function of a class.
    • ----

    null

    English

    Noun

    (en noun)
  • A non-existent or empty value or set of values.
  • Zero]] quantity of [[expression, expressions; nothing.
    • (Francis Bacon)
  • Something that has no force or meaning.
  • (computing) the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.
  • (computing) the attribute of an entity that has no valid value.
    • Since no date of birth was entered for the patient, his age is null .
  • One of the beads in nulled work.
  • (statistics) null hypothesis

    • Adjective

    (en adjective)
  • Having no validity, "null and void"
  • insignificant
  • * 1924 , Marcel Proust, Within a Budding Grove :
    • In proportion as we descend the social scale our snobbishness fastens on to mere nothings which are perhaps no more null than the distinctions observed by the aristocracy, but, being more obscure, more peculiar to the individual, take us more by surprise.
  • absent or non-existent
  • (mathematics) of the null set
  • (mathematics) of or comprising a value of precisely zero
  • (genetics, of a mutation) causing a complete loss of gene function, amorphic.

    • Derived terms

    * nullity

    Verb

    (en verb)
  • to nullify; to annul
    • (Milton)

    Related terms

    * annul

    See also

    * nil ----