What is the usage of return 0 in c++

Question

#include <iostream>
using namespace std;

int main() {
return 0;
}

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Answer 1

returns 0?

Answer 2

Could indicate 'successful execution' of a function - in main() it often indicates: 'programmer didn't bother to use return codes | compiler defaulted to 0 due to null return | success'.

For truth values, often 0==False.

Answer 3

It indicates the end of the program to the compiler.