Re: [linuxiran] [OT] C programming, variable size array

[Arash Partow]

Hi Aryan,

I went through your code, I've made some modifications etc.
have a look at the flow of the program. I think from that you 
will see how its done.

Regards

Arash
 

PS:
to compile type: make dynamic
to run type: ./dynamic
  
__________________________________________________
Be one who knows what they don't know,
Instead of being one who knows not what they don't know,
Thinking they know everything about all things.
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----- Original Message ----- 
From: "Aryan Ameri" <address@hidden>
To: <address@hidden>
Sent: Saturday, December 13, 2003 5:40 AM
Subject: [linuxiran] [OT] C programming, variable size array


> Hi There:
> 
> A while ago I was asked this question from a fellow friend of mine:
> 
> "Write a program, which promts the uset to enter some numbers. The user 
> should terminate the sequence of numbers by entering EOF character. The 
> program should put numbers entered by the user in to a 1D array".
> 
> Which seems pretty simple in first glance, but has one problem. When 
> initializing the array, I don't know it's size (and I don't want to ask 
> the user to enter it's size). The first soloution that came to my mind 
> was to initialize the array to a very big number. However this is not 
> elegant programming, and is a waste of memory. My second soloution was, 
> to initialize the array inside the loop, so that it enlarges it's size 
> continously each time the user inputs a number. I wrote the following 
> code:
> 
> #include <stdio.h>
> 
> main()
> {
> int tmp, cnt = 0;
> static int arr[cnt];
> printf( "Enter Number\n");
> scanf( "%d", &tmp);
> while ( (tmp = getchar() ) != EOF ) {
>         arr[cnt] = tmp;
>         cnt += 1;
>         static int arr[cnt];
>         printf( "Enter Number\n");
>         scanf( "%d", &tmp);
> }
> 
> return 0;
> }
> 
> This sounded logical to me. But the compiler (gcc 3.2) gives me a syntax 
> error saying that 'storage size of 'arr' isn't constant'. Well, I don't 
> want it to be constant!
> 
> I was wondering if any of you could help me solve this question. This is 
> not yet-another-student-asking-for-help-to-do-homework. This is a 
> problem for me, which has made me busy for a couple of days, and 
> googling and greping /usr/include and other basic methods didn't reveal 
> anything to me.
> 
> PS: Now that I am on the subject, can anyone point me to a active C 
> mailing list? one that I can ask these kind of question from, as they 
> come up? preferrably with a tendency towards Unix/Linux. (mailing lists 
> please, not newsgroups).
> 
> 
> Cheers
> -- 
> /*  Trademarks, Copyrights, Patents, etc are all loans from the public 
> domain. They are not a property ('intellectual' or otherwise.) */
> 
> 
> Aryan Ameri
> 
> 
> _______________________________________________
> bna-linuxiran mailing list
> address@hidden
> http://mail.nongnu.org/mailman/listinfo/bna-linuxiran
> 
>

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