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What type of parameter passing mechanism (call-by-value, call-by-reference, call-by-name, or-by-value result) is the following sequence of actions trying to implement for a procedure call $P (A[i])$ where P (i:integer) is a procedure and A is an integer array?

Is the implementation correct? Explain and correct it if necessary. You are supposed to make only small changes

  1. Create a new local variable, say z.
  2. Assign to z the value of A[i].
  3. Execute the body of P using z for A[i]
  4. Set A[i] to z.​

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implement the call by value result parameter passing technique 
as value is first copied
all changes done in local variable
and then again value copied in actual variable

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