Pointers and Arrays

An array's name decays to a pointer to its first element — but arrays and pointers are not the same thing.

Intermediate

data[i] is exactly *(data + i). When passed to a function, an array becomes a pointer and loses its size:

void print_all(const int *arr, size_t n) { /* pass the length separately */ }

Differences: sizeof(array) gives the whole array's size, sizeof(pointer) gives the pointer's size; you can reassign a pointer but not an array name.

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