Is it undefined behavior to form a pointer range from a stack address?

Question

Some C or C++ programmers are surprised to find out that even storing an invalid pointer is undefined behavior. However, for heap or stack arrays, it\'s okay to store the a

Answer 1

In general it would be undefined behaviour to point beyond the memory space, however there is an exception for "one past the end", which is valid according to the standard.

Therefore in the particular example, &c+1 is a valid pointer but cannot be safely dereferenced.