> Casting an integer to a pointer is implementation defined, not UB. You're right, that was a bad example. Here's a better one: int x, y; ptrdiff_t di

> Casting an integer to a pointer is implementation defined, not UB. You're right, that was a bad example. Here's a better one: int x, y; ptrdiff_t diff = &x - &y; This is Undefined Behavior, because &x and &y don't point to the same object.