Question

EDIT — can the down voter explain? I have a clear question, with supporting evidence, and proof of prior investigation. I would like to understand why you are down voting me…?

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I am getting this error when I compile with gcc:

error: incompatible types when assigning to type ‘struct cell’ from type ‘void *

The problem lines are:

    struct cell* cells = NULL;
    cells = malloc(sizeof(struct cell) * length);
    for (i = 0; i < length; i++) {
            cells[i] = malloc(sizeof(struct cell) * width);

I believe I have followed the proper protocol, as described here and also here. What am I missing?

Answer 1

For a multidimensional array, you want an array of type struct cell** cells:

struct cell** cells = NULL;
cells = malloc(sizeof(struct cell*) * length);
for(int i = 0; i < length; i++) {
  cells[i] = malloc(sizeof(struct cell)*width);
}

Now cells is a multidimensional array, where the first index range is the length and the second index range is the width.