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Date: Sat, 4 Jun 2011 16:20:52 +0300
Message-ID: <BANLkTinFMnrih3Zr7k=ED6+Mq6cCVjU3cA@mail.gmail.com>
Subject: Re: Different memory allocations were to the same location
From: Ozkan Sezer <sezeroz AT gmail DOT com>
To: djgpp AT delorie DOT com
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On Sat, Jun 4, 2011 at 4:02 PM, Mok-Kong Shen <mok-kong DOT shen AT t-online DOT de> wrote:
> I wrote a function to allocate memory to arrays of integers. But
> it turns out that the the momory allocated was always at the same
> location. What had I done improperly and how could I get around
> the problem? (I use version 2 of the compiler.)
>
> Thanks in advance.
>
> M. K. Shen
> -------------------------------------------------------------------
>
> #include <stdio.h>
> #include <stdlib.h>
>
> void generateintvec(int *uh, int len)
> { free(uh);
>  uh=calloc(len,sizeof(int));
>  if (uh==NULL) printf("memmory allocation unsuccessful !!!\n");
> }
>

This must change into something like:

void generateintvec(int **uh, int len)
{ free(*uh);
 *uh=calloc(len,sizeof(int));
 if (*uh==NULL) printf("memmory allocation unsuccessful !!!\n");
}

> int *vec1, *vec2;
>
> int main()
> { generateintvec(vec1,30);
>  generateintvec(vec2,30);

... And these calls must change accordingly to:

{ generateintvec(&vec1,30);
 generateintvec(&vec2,30);

>  if (vec1==vec2) printf("allocations were to the same location !!!\n");
>  return(0);
> }
>

Hope these help.

--
O.S.