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I am exposed to the pointer int* i, of which I only know its memory is allocated but am not sure it has been initialized to some integer or not.
If I try to deference it, what would happen? In other words, how should I check if it is initialized or not? If it is not, I’d like to assign an integer value to that address; otherwise I do nothing.
Define “initialized”. There will always be some value, and there is no way you can tell whether that value is a garbage or an integer, because any 32 bits of garbage will yield some value. You can dereference it though, no problem.