Is computing a pointer to uninitialized memory undefined behavior in C?

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If I understand correctly, this programme has undefined behavior in C++ because the intermediate value p + 1 is a pointer to uninitialized memory:

int main () {
    int x = 0;
    int *p = &x;
    p = p + 1 - 1;
    *p = 5;
}

If void were put in main's argument list (as required by the C grammar), would it also be undefined behavior in C?



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