[ Array Index Error ]

int a[10];
std::cin >> a[12];
std::cout << a[12];

Shouldn't the a[12] line raise an error as the array is only declared for 10 indexes? Is there something obvious I'm missing, or has it always been like this?

Answer 1

You are free to index out of range, but it is undefined behavior. This could eventually manifest in memory stomping, a write access error, or other.