void

It just happens to be defined as the one type with a length of zero.

The only thing is, you can't do anything to a variable space with a length of zero-- that would make no sense-- so what you can do with void variables is limited to things you can do without attempting to modify or access or do anything with the zero-length memory space it represents.
Thus, you can have a pointer to a void-type variable, or a function of type void (assuming you don't try to do anything with the value returned by the void) but you can't write or read anything into or from a void variable, nor do anything, such as =, which in any way tries to access the zero-length memory space. You can't even declare a normal void variable-- that would involve allocating a memory space of length zero, which again makes no sense. Again though, void pointers (void *) are very legal, and are used a _lot_ in the struct declarations of abstract data types which know they are going to be holding some kind of data but don't know ahead of time what type the data is going to be. Although note that in order to access the memory pointed to by a void *, you have to typecast it to some other kind of pointer.

Maybe it's best you just didn't think about it.

    Void - Composed by Marvin Giskard for T

      In a field a million buds stood,
    Over them a million days came - a day a bud -
    opening up one by one with their directed light.
      But one didn't do as others did,
    It waited for only your loving rays to shine upon it
    to open its pedals revealing the pure beauty of its sincere love.
      Never being unfaithful to its dream of the day of your light,
    Forced to resist any other light but yours - because of it -
    until the day the brilliance of your life sustaining light shines

    it will be there : wanting, wishing, waiting.

      Many were the buds you rather shined upon
    opening them - revealing their phony colours.
      I willed your light onto me but others you tried instead,
    No subtle motion reached you,
    still I refused other's light - holding out for you -
      Even when your light will fade,
    Not having found one to do your light justice,

    mine will still be there : wanting, wishing, waiting.

Aw, how romantic.

Void (?), a. [OE. voide, OF. voit, voide, vuit, vuide, F. vide, fr. (assumed) LL. vocitus, fr. L. vocare, an old form of vacare to be empty, or a kindred word. Cf. Vacant, Avoid.]

1.

Containing nothing; empty; vacant; not occupied; not filled.

The earth was without form, and void. Gen. i. 2.

I 'll get me to a place more void. Shak.

I 'll chain him in my study, that, at void hours, I may run over the story of his country. Massinger.

2.

Having no incumbent; unoccupied; -- said of offices and the like.

Divers great offices that had been long void. Camden.

3.

Being without; destitute; free; wanting; devoid; as, void of learning, or of common use.

Milton.

A conscience void of offense toward God. Acts xxiv. 16.

He that is void of wisdom despiseth his neighbor. Prov. xi. 12.

4.

Not producing any effect; ineffectual; vain.

[My word] shall not return to me void, but it shall accomplish that which I please. Isa. lv. 11.

I will make void the counsel of Judah. Jer. xix. 7.

5.

Containing no immaterial quality; destitute of mind or soul.

Pope.

6. Law

Of no legal force or effect, incapable of confirmation or ratification; null. Cf. Voidable, 2.

Void space Physics, a vacuum.

Syn. -- Empty; vacant; devoid; wanting; unfurnished; unsupplied; unoccupied.

© Webster 1913.

Void, n.

An empty space; a vacuum.

Pride, where wit fails, steps in to our defense, And fills up all the mighty void of sense. Pope.

© Webster 1913.

Void, v. t. [imp. & p. p. Voided; p. pr. & vb. n. Voiding.] [OF. voidier, vuidier. See Void, a.]

1.

To remove the contents of; to make or leave vacant or empty; to quit; to leave; as, to void a table.

Void anon her place. Chaucer.

If they will fight with us, bid them come down, Or void the field. Shak.

2.

To throw or send out; to evacuate; to emit; to discharge; as, to void excrements.

A watchful application of mind in voiding prejudices. Barrow.

With shovel, like a fury, voided out The earth and scattered bones. J. Webster.

3.

To render void; to make to be of no validity or effect; to vacate; to annul; to nullify.

After they had voided the obligation of the oath he had taken. Bp. Burnet.

It was become a practice . . . to void the security that was at any time given for money so borrowed. Clarendon.

© Webster 1913.

Void, v. i.

To be emitted or evacuated.

Wiseman.

© Webster 1913.