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Full Discussion: Integer array length
Top Forums Programming Integer array length Post 302851285 by yifangt on Sunday 8th of September 2013 02:53:42 AM
Old 09-08-2013
Integer array length

Hello;
When I wrote a function to print out an array,
Code:
void p_array(int arr[])
 {
   int i;
    int size = sizeof(arr) / sizeof(int);
 //    int size = sizeof (arr) / sizeof (arr[0]);
     for (i = 0; i < size; i++)
         printf("%d ", arr[i]);
     printf("\n");
 }

I could only print out the first two elements,( sometimes 8 out of 10 elements). What did I miss?
The problem seems to be the part
Code:
size = sizeof arr/sizeof(int);
size = sizeof arr /sizeof arr[0];

My understanding is (copied from stackoverflow):
sizeof returns the size in memory of the passed element. By dividing the size of an array by a single element size, you get the elements count. On the other hand, when counting elements in an array: sizeof(a) / sizeof(a[0]) will still work as well.
But my code does not! I saw this type online quite lot, but mine just does not work (Ubuntu 12.10, 64_bits kernel). Could anyone explain what is wrong with my code? Thanks a lot!
 

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GET_DEFINED_FUNCTIONS(3)						 1						  GET_DEFINED_FUNCTIONS(3)

get_defined_functions - Returns an array of all defined functions

SYNOPSIS
array get_defined_functions (void ) DESCRIPTION
Gets an array of all defined functions. RETURN VALUES
Returns a multidimensional array containing a list of all defined functions, both built-in (internal) and user-defined. The internal func- tions will be accessible via $arr["internal"], and the user defined ones using $arr["user"] (see example below). EXAMPLES
Example #1 get_defined_functions(3) example <?php function myrow($id, $data) { return "<tr><th>$id</th><td>$data</td></tr> "; } $arr = get_defined_functions(); print_r($arr); ?> The above example will output something similar to: Array ( [internal] => Array ( [0] => zend_version [1] => func_num_args [2] => func_get_arg [3] => func_get_args [4] => strlen [5] => strcmp [6] => strncmp ... [750] => bcscale [751] => bccomp ) [user] => Array ( [0] => myrow ) ) SEE ALSO
function_exists(3), get_defined_vars(3), get_defined_constants(3), get_declared_classes(3). PHP Documentation Group GET_DEFINED_FUNCTIONS(3)
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