Question

// set all values in the hash table to null
for(int i = 0; i < HASH_SIZE; i++)
{
    hashtable[i] = NULL;
}

I keep getting this error message in response to hashtable[i]:

assignment makes integer from pointer without a cast [-Werror]

Why?

Answer 1

If hashtable is an array of integers then hashtable[i] expects an integer and NULL is a pointer.

So you’re trying to assign a pointer value to an integer variable(without a cast), this is usually just a warning but since you have -Werror all warnings turn into errors.

Just use 0 instead of NULL.