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l05-add-del-sch - CS112: Data Structures Lecture 05...

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CS112: Slides for Prof. Steinberg ʼ s lecture 1 Lecture 5 CS112: Data Structures CS112: Data Structures Lecture 05 Structures for search/add/delete
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CS112: Slides for Prof. Steinberg ʼ s lecture 2 Lecture 5 Review: Recursion Review: Recursion Recursion is a way of looking at a problem EG problem: print pattern like * * * * * * * * * *
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CS112: Slides for Prof. Steinberg ʼ s lecture 3 Lecture 5 Recursion Recursion Non-recursive view * * * * * * * * * * A size 4 triangle is four lines, lengths 1, 2, 3, 4
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CS112: Slides for Prof. Steinberg ʼ s lecture 4 Lecture 5 Recursion Recursion Recursive view * * * * * * * * * * A size 4 triangle is A size 3 triangle, followed by A line of length 4
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CS112: Slides for Prof. Steinberg ʼ s lecture 5 Lecture 5 Recursive Definitions in Math Recursive Definitions in Math Factorial n! = n * (n-1)! 1! = 1 e.g., 3! = 3*2! = 3 * (2 * 1!) = 3 * (2 * 1) = 6 Definition looks circular, but is not Two parts: recursive case base case
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CS112: Slides for Prof. Steinberg ʼ s lecture 6 Lecture 5 Recursive Methods Recursive Methods Example: palindrome same letters backwards as forwards (assume no space or punctuation) e.g, radar madam im adam a man a plan a canal panama How can we write a method to test if a string is a palindrome?
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CS112: Slides for Prof. Steinberg ʼ s lecture 7 Lecture 5 Recursive Definition Recursive Definition A string is a palindrome if first and last characters are the same, and r ada r rest of string without first and last is a palindrome ada A string of length 0 or 1 is a palindrome d See RecString.java
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CS112: Slides for Prof. Steinberg ʼ s lecture 8 Lecture 5 Integer Power Integer Power 3 * 3 = 9 3 2 9 * 3 = 27 3 3 27 * 3 = 81 3 4 81 * 3 = 243 3 5 243 * 3 = 729 3 6 729 * 3 = 2187 3 7 2187 * 3 = 6561 3 8 7 *’s How many multiplies does it take to calculate 3 8 ? 3 * 3 = 9 3 2 9 * 9 = 81 3 4 81 * 81 = 6561 3 8 3 *’s 3 y/2 * 3 y/2 = 3 (y/2+y/2) = 3 y
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CS112: Slides for Prof. Steinberg ʼ s lecture 9 Lecture 5 Recursive Definition Recursive Definition y even: x y = x y/2 * x y/2 = (x y/2 ) 2 y odd: x y = x * x y/2 * x y/2 = x * (x y/2 ) 2 y = 1: x y = x y = 0: x y = 1 See Power.java
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CS112: Slides for Prof. Steinberg ʼ s lecture 10 Lecture 5 Seeing recursion look at a problem as if it were “pregnant”: inside it is a small version of the same problem Is “radar” a palindrome? is “ada” a palindrone?
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CS112: Slides for Prof. Steinberg ʼ s lecture 11 Lecture 5 Designing Recursive Methods Designing Recursive Methods Print triangle of *s * ** *** **** Print a triangle size 4, Can you see how solving a similar but smaller problem would help solve this one?
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CS112: Slides for Prof. Steinberg ʼ s lecture 12 Lecture 5 Designing Recursive Methods Designing Recursive Methods Print triangle of *s * ** *** **** To print triangle size 4, print a triangle of size 3 print 4 stars
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This document was uploaded on 11/01/2011 for the course 198 112 at Rutgers.

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l05-add-del-sch - CS112: Data Structures Lecture 05...

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