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Top Forums Programming Looping through multiple arrays in C. Post 303021242 by Azrael on Tuesday 7th of August 2018 06:51:07 AM
Old 08-07-2018
Looping through multiple arrays in C.

Not sure if this is possible, but I've tried this about a thousand ways now. I am making something with a lot of arrays. I thought I could put the array names into a separate array and then loop through them to call all of their elements. This is the best I've got so far:

Code:
#include <stdio.h>
#include <stdlib.h>

int main() {

	char c;

	int a [5] = {1,2,3,4,5};
	int b [5] = {6,7,8,9,10};

	for(c = 'a'; c <= 'b'; ++c) {
		for (int j = 0; j < 5; j++){
			printf("%d\n", c[j]);
		}
	}
}

From it I get the following error:
Code:
$ gcc canloop.c -o canloop
canloop.c: In function ‘main':
canloop.c:17:20: error: subscripted value is neither array nor pointer nor vector
    printf("%d\n", c[j]);

Oddly enough it still runs despite the error:
Code:
$ ./canloop 
0
1
2
3
4
0
1
2
3
4

Seems its not incrementing on the first loop with c. I've tried changing ++c to c++, casting, etc, but no change. Anyone know if this is not possible, some way to do this better or what I may be missing?
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ARRAY_CHUNK(3)								 1							    ARRAY_CHUNK(3)

array_chunk - Split an array into chunks

SYNOPSIS
array array_chunk (array $array, int $size, [bool $preserve_keys = false]) DESCRIPTION
Chunks an array into arrays with $size elements. The last chunk may contain less than $size elements. PARAMETERS
o $array - The array to work on o $size - The size of each chunk o $preserve_keys - When set to TRUE keys will be preserved. Default is FALSE which will reindex the chunk numerically RETURN VALUES
Returns a multidimensional numerically indexed array, starting with zero, with each dimension containing $size elements. ERRORS
/EXCEPTIONS If $size is less than 1 E_WARNING will be thrown and NULL returned. EXAMPLES
Example #1 array_chunk(3) example <?php $input_array = array('a', 'b', 'c', 'd', 'e'); print_r(array_chunk($input_array, 2)); print_r(array_chunk($input_array, 2, true)); ?> The above example will output: Array ( [0] => Array ( [0] => a [1] => b ) [1] => Array ( [0] => c [1] => d ) [2] => Array ( [0] => e ) ) Array ( [0] => Array ( [0] => a [1] => b ) [1] => Array ( [2] => c [3] => d ) [2] => Array ( [4] => e ) ) SEE ALSO
array_slice(3). PHP Documentation Group ARRAY_CHUNK(3)
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