The C programming language was not really designed with multi-dimensional arrays in mind. C sort of works with 2D arrays, but remember that they are either arrays of arrays or arrays of pointers to arrays. Get this wrong, and you will get lots of errors, or worse, segmentation faults.
3D arrays are a nightmare! Don't do it in C! Use a language better suited to multi-dimensional arrays, or an OO language with a tried-and-tested multi-dimensional array class. If you have to use C, don't use 3D arrays - emulate them instead!
my calculations of a 3D array are probably off, you will have to test that I got it right. The above code does not include the initialisation or destruction "methods" required before you can actually use this struct in anger. Once the indexing is correctly calculated the above struct will be much easier to use in C than proper 3D arrays.
Hi,
I am trying to assign an array as a value to one of the array element, I mean
I have an array @KS and array @kr.
I want array @KS to hold @kr as an element.
So I am doin this
$KS=@kr;
But the value stored is number of elements in the @kr array.
Can... (2 Replies)
Suppose there are two arrays of arrays:
@A = ( , , , );
@B = ( , , , , );
For each of $A, $A, $A..., I want to find the corresponding one in @B (match the letter, like $A eq $B), and print out both the second item, for example, $A and $B.
How can I do this in perl? grep + map? Hope I... (1 Reply)
PHP question...I posted this on the Web Development forum, but maybe this is a better place!
I have an SQL query that's pulled back user IDs as a set of columns. Rather than IDs, I want to use their names.
So I have an array of columns $col with values 1,7,3,12 etc and I've got an array $person... (3 Replies)
Hi All
I need to get <STDIN> from a user. the <STDIN> is a range of number delimited by "," (comma) and can be with range delimited by "-".
Example: 1,2,3,4-9,12,15,34-36,70
Now I need to get this from the user and go on each number and "Do something"... but when trying to do this as above... (2 Replies)
here is what i have...
i=1
while read line
do
if grep -i-q "create procedure"<<<$line
then
startline="$line"
endline="blahblah"
Get procedure name into a variable named procName
procName="procedure name is stored"
do some... (2 Replies)
hello,
i need a bit of help on how to do this effectively in bash without a lot of extra looping or massive switch/case
i have a long array of M elements and a short array of N elements, so M > N always. M is not a multiple of N.
for case 1, I want to stretch N to fit M
arrayHuge
H = (... (2 Replies)
I hate I'm asking for help again. Unfortunately it seems there just aren't any links I can find on making an array that holds a bunch of two dimensional arrays. Maybe my google-fu is lacking. Basically I have a header file like this:
#define MATRIX 10
int white_l1;
int white_l2;
int... (2 Replies)
Le sigh... Hopefully this will be the last time I have to ask for help on this topic. For a while now I've been working with a 1d array that holds 2d arrays. For reference you can view here. Now I'm just trying to loop through the elements with the following:
#include <stdio.h>
void... (3 Replies)
So I need to Write an array processing program using a Linux shell programming language to perform the following.
Load array X of 20 numbers from an input file X.
Load array Y of 20 numbers from an input file Y.
Compute array Z by multiply Xi * Yi then compute the square-root of this... (2 Replies)
Discussion started by: sarapham409
2 Replies
LEARN ABOUT OSX
xpc_array_get_count
xpc_array_create(3) BSD Library Functions Manual xpc_array_create(3)NAME
xpc_array_create -- creation and management of XPC arrays
SYNOPSIS
#include <xpc/xpc.h>
xpc_object_t
xpc_array_create(const xpc_object_t *objects, size_t count);
void
xpc_array_set_value(xpc_object_t array, size_t index, xpc_object_t value);
void
xpc_array_append_value(xpc_object_t array, xpc_object_t value);
xpc_object_t
xpc_array_get_value(xpc_object_t array, size_t index);
size_t
xpc_array_get_count(xpc_object_t array);
bool
xpc_array_apply(xpc_object_t array, xpc_array_applier_t applier);
void
xpc_array_set_bool(xpc_object_t array, size_t index, bool value);
void
xpc_array_set_int64(xpc_object_t array, size_t index, int64_t value);
void
xpc_array_set_uint64(xpc_object_t array, size_t index, uint64_t value);
void
xpc_array_set_double(xpc_object_t array, size_t index, double value);
void
xpc_array_set_date(xpc_object_t array, size_t index, int64_t value);
void
xpc_array_set_data(xpc_object_t array, size_t index, const void *bytes, size_t length);
void
xpc_array_set_string(xpc_object_t array, size_t index, const char *value);
void
xpc_array_set_uuid(xpc_object_t array, size_t index, const uuid_t value);
void
xpc_array_set_fd(xpc_object_t array, size_t index, int value);
void
xpc_array_set_connection(xpc_object_t array, size_t index, xpc_connection_t value);
bool
xpc_array_get_bool(xpc_object_t array, size_t index);
int64_t
xpc_array_get_int64(xpc_object_t array, size_t index);
uint64_t
xpc_array_get_uint64(xpc_object_t array, size_t index);
double
xpc_array_get_double(xpc_object_t array, size_t index);
int64_t
xpc_array_get_date(xpc_object_t array, size_t index);
const void *
xpc_array_get_data(xpc_object_t array, size_t index, size_t *length);
const uint8_t *
xpc_array_get_uuid(xpc_object_t array, size_t index);
const char *
xpc_array_get_string(xpc_object_t array, size_t index);
int
xpc_array_get_fd(xpc_object_t array, size_t index);
xpc_connection_t
xpc_array_get_connection(xpc_object_t array, size_t index);
ARRAYS
XPC arrays are collections of XPC objects ordered by index. The index is zero-based. XPC arrays are contiguous, and values must exist at all
indexes between zero and the greatest index of the array. A hole in the array can be simulated by using a null object as returned by
xpc_null_create(3).
CREATION
The xpc_array_create() function returns a newly created array. The caller may optionally provide objects, a C array of XPC object references,
to initialize the array. The count is used to specify the size of the C array. If objects is NULL, then count must be zero. If count speci-
fies more elements than are actually present in values or if values is NULL and count is non-zero, the behavior is undefined.
GETTING AND SETTING VALUES
The xpc_array_append_value() function may be used to append a value to the end of an array. This operation increases the count of the values
in the array by one.
The value of a specific index in the array may be set using the xpc_array_set_value() function. The value must be non-NULL, and the index
must already exist (i.e. less than the count provided at creation or extended through previous append operations).
The value at a specific index of an array may be retrieved using the xpc_array_get_value() function. The result of getting a non-existing
index (i.e. one that was not specified at creation or through a previous append operation) in undefined.
PRIMITIVE GET AND SET FUNCTIONS
Various functions exist for retrieving primitive C and operating system types directly from an array without the need for an intermediate
boxed object. See xpc_object(3) for more information.
The special XPC_ARRAY_APPEND constant may be used to append a value to the end of the array instead of operating on a specific index.
SEE ALSO xpc_object(3), xpc_objects(3), xpc_dictionary_create(3)Darwin 1 July, 2011 Darwin