Answer Posted / vino

Mostly  call by value and call by reference is differ  from 
copy and modify process..
Copy:
Call by value:
It take difference memory locations  for variables.Duplicate copy of the original parameter is passed.
Call by reference:
It takes Same memoy locations for  variables.Actual copy of the original parameter is passed.
Modify:
Call by value:
No affect on original parameter after modifying the parameter in functions.
Call by reference:
original parameter can be affect afetr modifying the parameter in function..

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