C++ What the p ...
What the program will print:

s.cpp: 
const char* const S = "Hello World";
main.cpp 
#include <iostream>

extern const char* const S;

int main() {
    std::cout << S << std::endl;
    return 0;
}
Explanation
According to the "3.5 Program and linkage" of standard S it will have an internal linkage and is only available in the s.cpp:
A name having namespace scope (3.5.3) has internal linkage if it is the name of
— an object or reference that is explicitly declared const and neither explicitly declared extern nor previously declared to have external linkage

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