Web Reference: A pointer-to-a-pointer is used when a reference to a pointer is required. For example, when you wish to modify the value (address pointed to) of a pointer variable declared in a calling function's scope inside a called function. Nov 14, 2025 · For example, "int *ptr;" declares a pointer to an integer. Accessing the pointer directly will just give us the address that is stored in the pointer. To get the value at the address stored in a pointer variable, we use * operator which is call dereferencing operator in C Note that we use * for two different purposes in pointers. This is called a pointer to pointer (or "double pointer"). It might sound confusing at first, but it's just one more level of indirection: a pointer that stores the address of another pointer.
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