Create 2D array with "new"? [duplicate]

Question

I want to create a 2D array like the following.

char **dog = new char[480][640];

But it errors:

error C2440: 'initializing' : cannot convert from 'char (*)[640]' to 'char ** '
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

what do I need to do using "new"? (not using calloc, malloc or char dog[480][640];)

Answer 1

Something like this:

char **dog = new char *[480];
for (int i = 0; i < 480; i++)
    dog[i] = new char[640];

And the same when deleting, but then the loop first.

Answer 2

If you want to get memory from heap, you can use it this way:

// declaration
char *dog = new char[640*480];

// usage
dog[first_index * 640 + second_index] = 'a';

// deletion
delete[] dog;

Answer 3

You're creating a pointer to a pointer by using **. I'm not sure you want that, you probably want a normal pointer (*).