Size of an array in C

Hady · 04-04-2004, 04:59 AM

How can I get the size of an array[] of integers in C?

wapcaplet · 04-04-2004, 05:30 AM

Someone correct me if I'm wrong, but I don't think you can, unless you use some special value that marks the end of the array.

luxitan · 04-04-2004, 05:37 AM

if it is a static array you can: sizeof(array)/sizeof(int)
if it is dinamic you can't

wapcaplet · 04-04-2004, 03:14 PM

Ah yes, forgot about sizeof(). And yes, it only works for statically allocated arrays.

shishir · 04-05-2004, 01:56 AM

luxitan:
if it is a static array you can: sizeof(array)/sizeof(int)
if it is dinamic you can't

what you just suggested gives the number of elements in an array , and that too only if it is an array of int...

just the sizeof should do

sharpie · 04-05-2004, 06:48 PM

Do you want the size in bytes, or the number of elements?

If you want the size in bytes, a simple:

Code:

sizeof array

will suffice. If you want the number of elements, use:

Code:

sizeof array / sizeof array[0]

The sizeof operator returns the size in bytes, so you're dividing the number of bytes in the whole array, by the number of bytes in the first element, thus you get the amount of elements.

maseby · 04-06-2004, 05:33 AM

sizeof array / sizeof array[0]