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Recursion
carries111
Nov 19, 2015
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Recursion
Recursive Functions and Data
Integer Exponentiation
ADV: identify other cases and work more efficiently
Greatest Common Divisor(GCD)
Eucid's Algorithm: gcd(132, 20) = gcd(20, 12)
Directory Crawler
Helper Methods
2-methods approach
dividing the recursive method into a pub and pri
CS: Prefix Evaluator
Infix, prefix and postfix notation
infix notation is the only notation need ()
evaluating prefix expressions
A better Example of recursion
the sequence of the recursive case and the perform method is very important
recursive case first: reverse
perform method first: sequence
Thinking Recursively
basic
Iteration
Recursion
A Nonprogramming Example
An iterative solution converted to recursion
recursive is like a person in the line
hold the method. After each one
finish the method in hand, we get the
result
Structure of Recursive Solution
base case
solved immediately
like a end of loop
at least one
recursive case
reduce problem to simpler problem
solved by recursive call
at least one
if {base} else {recursive case}
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