Question: You may have written programs that call exit, or return from main with some value, and wondered what happens to that value. The value can

You may have written programs that call exit, or return from main with some value, and wondered what happens to that value. The value can be returned to a parent process when the parent calls wait on the child: if the child calls exit(0) then the value 0 can be returned to the parent via wait. Why have this functionality, why might it be useful?

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