[Solved] Incompatible types in assignment. C [closed]

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Presumably MAC_ADRESSES is not an array of pointers. NULL is a pointer (normally (void *)0 in C), so you can’t assign it to a non-pointer variable.

Edit: Since your definition is char MAC_ADRESSES[MAX_LINES][100], you have a 2D array, not an array of pointers. You can’t store NULL in this array. You can wipe out a string by putting a null character in the first byte, though:

            MAC_ADRESSES[j][0] = '\0';

Note that you can’t test strings for equality using ==, either. You should be using strcmp.

solved Incompatible types in assignment. C [closed]