Stack. Because of its LIFO (Last In First Out) property it remembers its 'caller' so knows
whom to return when the function has to return. Recursion makes use of system stack for storing
the return addresses of the function calls.
Every recursive function has its equivalent iterative (non-recursive) function. Even when
such equivalent iterative procedures are written, explicit stack is to be used.
Jun 12th, 2014
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