Order of operations for dereference and bracket-ref in C

Question

If I do *ptr[x], is that equivalent to *(ptr[x]), or (*ptr)[x]?

Answer 1

*(ptr[x])

See the Wikipedia operator precedence table, or, for a more detailed table, this C/C++ specific table.

Answer 2

In C, all postfix operators have higher precedence than prefix operators, and prefix operators have higher precedence than infix operators. So its *(ptr[x])