RE: [FWP] That was productive...

["Larry Rosler" <lr@hpl.hp.com>]

> From: John Porter [mailto:jdporter@min.net]
> Sent: Tuesday, January 18, 2000 15:09
> To: Fun With Perl
> Subject: Re: [FWP] That was productive...
>
>
> * Larry Rosler (lr@hpl.hp.com) [000118 14:07]:
> >
> > Quite unlike Perl, the type of an array in C
> > includes its size, which is statically compiled.
> >
> > So to find the number of elements in the array a,
> >
> >     sizeof(a) / sizeof(a[0])
> >
> > And the index of the last element is one less than that.
>
> Of course, this only works for static and automatic
> variables, not for dynamic ones.
> (Or am I wrong?  And who cares?  ;-)

Well, I sort of, used to care.  :-)

There are no dynamic arrays in C, only dynamic blocks of memory.
Strings are sequences of bytes terminated by a null byte, so strlen
works.
The length of 'arrays' (sequences of scalars) in allocated memory has to
be specified by an external mechanism.

As I said, the size of a C array is part of its type.  Different sizes
are different types.

--
Larry Rosler
Hewlett-Packard Laboratories
http://www.hpl.hp.com/personal/Larry_Rosler/
lr@hpl.hp.com



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