# ch15 - Chapter 15 Recursive Algorithms Recursion Recursion...

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Chapter 15 Recursive Algorithms

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2 Recursion Recursion is a programming technique in which a method can call itself to solve a problem A recursive definition is one which uses the word or concept being defined in the definition itself; when defining an English word, a recursive definition usually is not helpful
Basic Elements of Recursion A recursive method is a method that contains a statement that makes a call to itself. Any recursive method will include the following three basic elements: A test to stop or continue the recursion. An end case that terminates the recursion. A recursive call that continues the recursion.

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4 Recursive Definitions Mathematical formulas often are expressed recursively N!, for any positive integer N, is defined to be the product of all integers between 1 and N inclusive This definition can be expressed recursively as: 1! = 1 N! = N * (N-1)! The concept of the factorial is defined in terms of another factorial until the base case of 1! is reached
Recursive Definitions 5! 5 * 4! 4 * 3! 3 * 2!

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## This note was uploaded on 08/18/2011 for the course COMPUTER S CSC113 taught by Professor Shah during the Spring '09 term at King Saud University.

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ch15 - Chapter 15 Recursive Algorithms Recursion Recursion...

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