[Solved] How Do I Check If An Element In An Array Is An Address? [closed]

No, there’s no way to tell whether an array element has been initialized or not.

You could use calloc() instead of malloc(), this automatically initializes everything to 0, so you could do:

if (array[0] == 0) {
    array[0] = 5;
} else {
    array[0] *= 3;
}

But this won’t work if 0 is a valid value in your array.

Instead of an array of integers, you could use an array of structs, and put an initialized field in the struct.

struct element {
    int initialized;
    int value;
};

After allocating the array, you’ll need to fill in the initialized field in all the elements, to show that the values aren’t yet initialized.

array = malloc(N * sizeof(struct element));
for (int i = 0; i < N; i++) {
    array[i].initialized = 0;
}

Then you can do:

if (!array[0].initialized) {
    array[0].value = 5;
    array[0].initialized = 1;
} else {
    array[0].value *= 3;
}