C array initialization.

Posted by chrisdew on Stack Overflow See other posts from Stack Overflow or by chrisdew
Published on 2010-05-06T14:32:04Z Indexed on 2010/05/06 14:48 UTC
Read the original article Hit count: 306

Filed under:

c

|

array

Why does

static char *opcode_str[] = { "DATA"
                            , "DATA_REQUEST_ACK"
                            , "ACK_TIMER_EXPIRED"
                            , "ACK_UNEXPECTED_SEQ"
                            , "ACK_AS_REQUESTED"
                            } ;

work, but

static char **opcode_str = { "DATA"
                           , "DATA_REQUEST_ACK"
                           , "ACK_TIMER_EXPIRED"
                           , "ACK_UNEXPECTED_SEQ"
                           , "ACK_AS_REQUESTED"
                           } ;

fails with SEGV when opcode_str[0] is printf'd?

I think it's because the second listing has not allocated memory for the five element array of pointers, but I need a more comprehensive explanation.

All the best,

Chris.

Related posts about array

Array reverse and Array sort on One int array and store into another array using delgate

as seen on Stack Overflow - Search for 'Stack Overflow'
Array reverse and Array Sort on an int array and store into another array using a delegate. We have to accept the elements from the user >>> More
LWJGL Voxel game, glDrawArrays

as seen on Game Development - Search for 'Game Development'
I've been learning about 3D for a couple days now. I managed to create a chunk (8x8x8). Add optimization so it only renders the active and visible blocks. Then I added so it only draws the faces which don't have a neighbor. Next what I found from online research was that it is better to use glDrawArrays… >>> More
Sorting a Multidimensional array...

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to sort an array that can look like this: $array[4][0] = array('id' => 1, 'value' => 2); $array[3][2] = array('id' => 0, 'value' => 3); $array[4][1] = array('id' => 1, 'value' => 0); $array[1][3] = array('id' => 2, 'value' => 1); $array[1][1] = array('id' => 3, 'value'… >>> More
why i add more insignificant code but cost less time

as seen on Stack Overflow - Search for 'Stack Overflow'
i write a method and when i add some insignificant code it works faster, like these : array[1]=array[1]; array[0]=array[0]; array[3]=array[3]; array[2]=array[2]; i use double t=System.currentTimeMillis(); at first to record the time. then call the method and use System.out.println(System.currentTimeMillis()-t);… >>> More
Difference between array('Acl' => array('type' => 'requester')) and array('Acl' => 'requester') in C

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm following the ACL tutorial for CakePHP 1.3 and I was wondering if there is a functional difference between declaring a behavior like this: var $actsAs = array('Acl' => 'requester'); and like this: var $actsAs = array('Acl' => array('type' => 'requester')); >>> More

Developer IT

C array initialization. - Developer IT

C array initialization.

c

array

Related posts about c

Related posts about array

Array reverse and Array sort on One int array and store into another array using delgate

LWJGL Voxel game, glDrawArrays

Sorting a Multidimensional array...

why i add more insignificant code but cost less time

Difference between array('Acl' => array('type' => 'requester')) and array('Acl' => 'requester') in C

Categories cloud