kalayama

 Profile Answers by kalayama 

• Dec 5th, 2006

 

As far as I know NO.By the way, why would you want to do that?

santhosh

• Dec 23rd, 2006

 

it is possible, but you may lose some datas or you may consume more space to store even a smaller size datas unknowingly. i.e a[' '];

Deepam

• Jan 3rd, 2007

 

No ,its not possible to have a dynamic array without using calloc,malloc or without ptr.... Why u want to know abt it? but u can achieve a array without specifying size say arr[]; but its not efficient as when u use this array..more space will be allocated and if the data stored is less...naturally more space remain unused so loss.Its not the efficent way of doing this..to overcome this only they developed a concept called Dynamic memory using calloc,malloc,new ,delete...

jbode

 Profile Answers by jbode Questions by jbode

• Feb 1st, 2011

 

C99 introduced the concept of a Variable Length Array (VLA), where the array size doesn't have to be known until runtime:

size_t elements=10;
int arr[elements];

They act pretty much like regular, statically-allocated arrays, with a few restrictions (you cannot initialize them like regular arrays, for example, and they cannot be declared at file scope).  Like regular arrays, their lifetime is limited to their enclosing scope (as opposed to objects allocated with malloc() or calloc()). 

They come in handy when you don't know ahead of time how much memory you will need for a specific operation within a function, but don't want to deal with memory management operations (malloc() and free()).