A pointer constant is equivalent to a symbolic constant, in that the address stored in the pointer constant cannot be changed once it is set.

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Quizplus · Accepted Answer

A pointer constant, once initialized with an address, cannot have its address changed, similar to how a symbolic constant's value cannot be changed once it is set. This immutability of the address in a pointer constant is what makes the comparison valid.

A Pointer Constant Is Equivalent to a Symbolic Constant, in That