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Array size

Posted on 2008-06-22
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Last Modified: 2010-04-21
hi,

is there a built in function to get size of array ? thanks
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Question by:zizi21
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6 Comments
 
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Expert Comment

by:HuyBD
ID: 21843760
try use
sizeof(arr);
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LVL 53

Expert Comment

by:Infinity08
ID: 21843799
>> is there a built in function to get size of array ?

Depends what you mean by that. If you mean you want to get the size of a statically defined array, you can do this :

        Object array[10];
        int size = sizeof(array) / sizeof(array[0]);

and size will have the value 10.

This ONLY works for statically allocated arrays though.

Can you be a bit more specific ?
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Author Comment

by:zizi21
ID: 21843844
hi,

i have an array which is dynamically allocated...

i want to know the number of elements..currently, i am looping through the array to find the number of elements...maybe..., i thought, there is a built in function...
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LVL 53

Accepted Solution

by:
Infinity08 earned 2000 total points
ID: 21843855
>> i have an array which is dynamically allocated...

There is no way of knowing the size of a dynamically allocated array from the pointer alone. So, you'll have to store the size of the array somewhere, either using a separate integer value, or by using a terminator in the array. The latter is commonly used for char arrays (strings), where a standard strlen function exists that gets the length of the string by looking for the terminator.

The most common way is to just store the size separately :

        int *array = (int*) calloc(10, sizeof(int));
        int size = 10;
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Author Closing Comment

by:zizi21
ID: 31469640
thanks a million
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LVL 53

Expert Comment

by:Infinity08
ID: 21844128
No problem. Glad to be of assistance :)
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