Where does the returned value for 'main' function go?

Question

In C, a function always returns its value to the calling function and never to itself (if return type is not void). Like,

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Answer 1

Where does the returned value for 'main' function go?

It is returned to the calling process.

On a POSIX compliant systems if the calling parent process were a C program it could at least retrieve the lowest 8bit of its child's return value by calling wait() or waitpid() after the child ended.