If the value can change then do the memory initialization at run-time using
malloc/calloc.
The line 5 is giving error because the declaration of an array (and so the
allocation of memory) happens at compile time, while the initialization of
the variables happen when the program is loaded for the execution. In that
case, you are asking compiler to allocate the memory but how much has to be
decided at run-time, so the compiler throws an error!
To make initializations, use compile time constants using const keyword or
macros or giving the size by yourself..
Thanks & Regards,
Prashant Bhutani
Senior Undergraduate
Computer Science & Engineering (B.Tech)
Institute of Technology - BHU (IT-BHU)
Varanasi-221005
On Sat, Jul 30, 2011 at 1:14 PM, sukhmeet singh <sukhmeet2...@gmail.com>wrote:
> just adding to the concept.. this is not allowed since value of max may
> change during the program .. either by declaring it as a macro or as a const
> we (as said by ankur and varun ) restrict that the value from changing
> during the program ..!!
>
> On Sat, Jul 30, 2011 at 1:09 PM, Ankur Khurana
> <ankur.kkhur...@gmail.com>wrote:
>
>> or const int max=5;
>>
>>
>> On Sat, Jul 30, 2011 at 1:09 PM, varun pahwa <varunpahwa2...@gmail.com>wrote:
>>
>>> make max as a macro. as for c static memory allocation take place either
>>> with a constant or a macro.
>>> i.e.
>>> either u declare
>>> #define max 5
>>> then write float arr[max];
>>>
>>> or u may write
>>>
>>> float arr[5];
>>>
>>>
>>>
>>>
>>> On Sat, Jul 30, 2011 at 1:05 PM, Arshad Alam <alam3...@gmail.com> wrote:
>>>
>>>> Why it is showing an error at line number 5
>>>>
>>>>
>>>> 1. void main()
>>>> 2. {
>>>> 3. clrscr();
>>>> 4. int i,max=5;
>>>> 5. float arr[max];
>>>> 6. for(i=0;i<max;i++)
>>>> 7. scanf("%f",&arr[i]);
>>>> 8. getch();
>>>> 9. }
>>>>
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>>>
>>>
>>>
>>> --
>>> Varun Pahwa
>>> B.Tech (IT)
>>> 7th Sem.
>>> Indian Institute of Information Technology Allahabad.
>>> Ph : 09793899112
>>> Official Email :: rit2008...@iiita.ac.in
>>> Another Email :: varunpahwa.ii...@gmail.com
>>>
>>> People who fail to plan are those who plan to fail.
>>>
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>>
>>
>>
>> --
>> Ankur Khurana
>> Computer Science
>> Netaji Subhas Institute Of Technology
>> Delhi.
>>
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>
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