Blank size

Question

if we omit the size of an array
int a[];
does it give error??
coz ,
in c language it does give error.

Answer 1

This is one of those I'd just try :)

Error: storage size of 'a' is not known.

The compiler has to know how much space to allocate because it goes in a specific segment during bootstrap (start up) of the compiled binary. This is not a c/c++ thing...it's an OS thing.

To get around this, one option is dynamic allocation.

Answer 2

It gives error in compiled languages using static arrays, you should make dynamic arrays or vectors
It doesn't in some scripting languages where arrays are always dynamic, like JavaScript.