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I found this explanation:

call by value: copy going into the procedure

call by result: copy going out of the procedure

call by value result: copy going in, and again going out

But I don't understand, if we don't copy input, than how call by result differ from call by reference and for what we are make copy in the end of procedure. Can anybody explain?

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iambackend
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  • Possible duplicate of [Pass by Value and Pass by Reference](https://stackoverflow.com/questions/29156958/pass-by-value-and-pass-by-reference) – 1ac0 Sep 19 '17 at 08:33

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