Heap allocate a 2D array (not array of pointers)

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Well, if you want to allocate array of type, you assign it into a pointer of that type.

Since 2D arrays are arrays of arrays (in your case, an array of 512 arrays of 256 chars), you should assign it into a pointer to array of 256 chars:

char (*arr)[256]=malloc(512*256);
//Now, you can, for example:
arr[500][200]=75;

(The parentheses around *arr are to make it a pointer to array, and not an array of pointers)

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