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Re: [PROGRAMMERING] Bog om C



Michael Rasmussen wrote:
On Wed, 12 May 2004 11:29:12 +0200, henrik wrote:


På novice-niveau siger du? Tak skal du have! Nå,

Nu var det ikke en henvisning til, at du er novice. Blot en oplysning til dig om, at du ikke havde grund til at anskaffe den, hvis du selv mente, du var over novice stadiet:-)

faktisk har jeg et novicespørgsmål: Jeg

har set i C-kode at strukturer


af variabel størrelse defineres noget lignende sådan her: struct text
{
   int length;
   char data[1];
};
hvor data så kan have hvilken som helst længde. Er der nogen som kan
sige mig hvordan det fungerer og hvad fidusen er med denne konstruktion?
Hvorfor ikke ... char *data; ...?


En god grund kunne være, at struct's selv reserverer den nødvendige hukommelse, der er behov for, så hvis længde sættes til 10, vil struct have længden 10 + 1 bytes (char data[1], der så kan bruges til '\0').


Det vil jeg gerne have forklaret nærmere. Michael, kunne du ikke vise det med et lille eksempel?


Pft Kneth

--
Kenneth Geisshirt, M.Sc., Ph.D.  --  http://kenneth.geisshirt.dk
         Good judgment comes from experience.
              Experience comes from bad judgment. -- Jim Horning


 
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