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From: | Martin Ambuhl <mambuhl AT earthlink DOT net> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Trouble of using very large arrays |
Date: | Fri, 23 Apr 2004 20:08:38 -0400 |
Lines: | 32 |
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Alex Vinokur wrote: > "Martin Ambuhl" <mambuhl AT earthlink DOT net> wrote in message news:c6bafb$a9mhn$2 AT ID-227552 DOT news DOT uni-berlin DOT de... > >>Cesar Rabak wrote: >> >> >>>Brian Inglis escreveu: >> >>> > this is cleaner and more maintainable: >>> > >>> > a = malloc(rows * columns * sizeof *a); >>> > >>>This is not a good advice: you're changing the allocation of an object >>>of (rows x columns) ints to another of (rows x columns) pointers to int. >> >>You are, I regret to say, in error. The type of *a is int, not >>pointers-to-int. >> > > > You are right. So, > a = malloc(rows * columns * sizeof a); Huh? Why change the correct a = malloc(rows * columns * sizeof *a); to something that's wrong? The fact is that ptr = malloc(number * sizeof *ptr); is the accepted, common C idiom here, no matter what the type of ptr. That's the point.
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