Question

I’ve got about 12000 pre known values that I need to place in an array early in the program. Given certain circumstances, I will later need to resize this array with realloc. Is there any way to initialize an array with malloc/calloc with values, or fill an array with several other values?

Answer 1

You cannot initialize a malloced array this way, your best chance is to have it statically in your program, and copy it to a malloced array at the beginning of the run, e.g.:

static int arr[] = {1,2,3,4};
static int * malloced_arr;

// in the init function
malloced_arr = malloc(sizeof(arr));
if (malloced_arr)
{
    memcpy(malloced_arr, arr, sizeof(arr));
}