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

You could define c as an array of size 1:

char c[1] = { 'X' };

Then the undefined behavior would become defined behavior. Resulting code should be identical.