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Date Posted: 09:25:20 03/07/02 Thu
Author: Hjálmtýr
Subject: Re: fallið gefa
In reply to: 's message, "fallið gefa" on 08:35:08 03/07/02 Thu

>ég er með fallið void
>gefa(node *p,STACK s, int fjoldi)
>{
> for (int i = 0; inext)
> p->next = new node(s.pop(), p->next);
>
>}
>skilgreint í struct node og svo geri ég
>gefa(headt,stokkur,5);
>gefa(headn,stokkur,5);
>í main fallinu en listinn sem hausahnúturinn headn
>bendir á fær sömu spilin og headt bendir á. Af hverju
>er stokkurinn óbreyttur eftir gefa aðferðina? Það er
>eins og stokkur gefi spilin og taki þau svo til baka
>og lætur næsta fá sömu spil.

Til þess að stokkurinn breytist þarft hann að vera sendur inn sem tilvísunarviðfang. Rétti hausinn á fallinu er:

void gefa( node *p, STACK<Spil> &s, int fjoldi )

Þar sem þú notar greinilega haushnúta, þá þarf hnútabendirinn p ekki að vera tilvísunarviðfang, þar sem
þú breytir honum ekki, heldur því sem hann bendir á, þ.e. haushnútnum. Ef þú notaðir ekki haushnúta, þá þyrfti p
líka að vera tilvísunarviðfang (kæmi "node *&p" í stað "node *p").

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