What does the following declaration mean?
int (*ptr)[10];

The declaration int (*ptr)[10]; means that ptr is a pointer to an array of 10 integers.

Here's the breakdown:

int specifies the type of elements in the array (integers).
(*ptr) indicates that ptr is a pointer.
[10] specifies that the pointer points to an array of 10 integers.

Thus, ptr is not an array of pointers, nor an array of integers, but a pointer to an array of integers with a size of 10.