How to get the number of elements of a C-array like this? [duplicate]

Question

I have a C-array like this:

double arr[] = { 0.0, 0.1, 0.2, 0.5, 0.1, 0.2, 0.3, 0.4, 0.2, 0.0, 0.1, 0.3 };

Is it safe to get the number of elements like this?

int numElements = sizeof(arr)/sizeof(arr[0]);

Or is there a better way?

Remember this will not work for dynamic arrays, I also explain how sizeof(arr)/sizeof(arr[0]) works/meaning — Grijesh Chauhan
– Grijesh Chauhan, Commented Aug 7, 2013 at 14:25

user2550754 · Accepted Answer · 2013-08-07 12:06:08Z

5

This is the best way. Even it is suggested in C programming book by Dennis ritchie.

answered Aug 7, 2013 at 12:06

user2550754

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Community · Accepted Answer · 2017-05-23 12:23:20Z

this is a safe way and if you'll look at other question about size of array you'll find this as one of the most common suggestions

and so on.

actually in the last one the suggestion is to do

#define ARRAY_SIZE( array ) sizeof( array ) / sizeof( array[0] )

Tony The Lion · Accepted Answer · 2013-08-07 12:05:18Z

2

I don't know of any other way to do this, since you don't have a size.

It is reliable, yes.

answered Aug 7, 2013 at 12:05

Tony The Lion

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Comments

Govind Balaji · Accepted Answer · 2013-08-07 12:08:59Z

There are no other better way according to my knowledge, there are no problem in this one.
In java, there are jagged arrays. If it's also in c, then your thought may be correct.

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