Const Multidimensional array

Question

In C, how would I add the const modifier (or any other modifier) to a global multidimensional array so that both the variable and the values it holds are constant. For example how would I add a const modifier to this: ``` byte fruitIds[][2] = { { 0x01, 0x02}, {0x02, 0x03} } ``` so that at the end of the assignment you can't do this: ``` fruitIds = vegetableIds; ``` or this: ``` fruitIds[0] = {0x02, 0x03}; ``` or this: ``` fruitIds[0][0] = 0x02; ```

Accepted Answer

Arrays are already non-modifiable lvalues. That just means you need to make the values `const`:

```
const byte fruitIds[][2] = { { 0x01, 0x02}, { 0x02, 0x03} };
```

These assignments from your post:

```
fruitIds = vegetableIds;
fruitIds[0] = {0x02, 0x03};
```

Are already illegal. The latter isn't even valid syntax, but I get a `read-only variable is not assignable` message from `clang` trying to do the former.

Const Multidimensional array

Solution

Problem