Starting Out with Java: Early Objects (6th Edition)
6th Edition
ISBN: 9780134462011
Author: Tony Gaddis
Publisher: PEARSON
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Textbook Question
Chapter 14, Problem 4SA
What type of recursive method do you think would be more difficult to debug: one that uses direct recursion or one that uses indirect recursion? Why?
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When recursion is used to solve a problem, why must the recursive method call itself to solve a smaller version of the original problem?
What is the difference between direct and indirect recursion?
Ex. 01 : Recursion
About
So far, we have learned that we can perform repetitive tasks using loops. However, another way is by creating methods that call themselves. This programming technique is called recursion
and, a method that calls itself within it's own body is called a recursive method. One use of recursion is to perform repetitive tasks instead of using loops, since some problems seem to be
solved more naturally with recursion than with loops.
To solve a problem using recursion, it is broken down into sub-problems. Each sub-problem is similar to the original problem, but smaller in size. You can apply the same approach to each
sub-problem to solve it recursively.
All recursive methods use conditional tests to either
1. stop or
2. continue the recursion.
Each recursive method has the following characteristics:
1. end/terminating case: One or more end cases to stop the recursion.
2. recursive case: reduces the problem in to smaller sub-problems, until it reaches (becomes) the end…
Chapter 14 Solutions
Starting Out with Java: Early Objects (6th Edition)
Ch. 14.2 - It is said that a recursive algorithm has more...Ch. 14.2 - Prob. 14.2CPCh. 14.2 - What is a recursive case?Ch. 14.2 - What causes a recursive algorithm to stop calling...Ch. 14.2 - What is direct recursion? What is indirect...Ch. 14 - Prob. 1MCCh. 14 - This is the part of a problem that can be solved...Ch. 14 - This is the part of a problem that is solved with...Ch. 14 - This is when a method explicitly calls itself. a....Ch. 14 - Prob. 5MC
Ch. 14 - Prob. 6MCCh. 14 - True or False: An iterative algorithm will usually...Ch. 14 - True or False: Some problems can be solved through...Ch. 14 - True or False: It is not necessary to have a base...Ch. 14 - True or False: In the base case, a recursive...Ch. 14 - Find the error in the following program: public...Ch. 14 - Prob. 1AWCh. 14 - Prob. 2AWCh. 14 - What will the following program display? public...Ch. 14 - Prob. 4AWCh. 14 - What will the following program display? public...Ch. 14 - Convert the following iterative method to one that...Ch. 14 - Write an iterative version (using a loop instead...Ch. 14 - What is the difference between an iterative...Ch. 14 - What is a recursive algorithms base case? What is...Ch. 14 - What is the base case of each of the recursive...Ch. 14 - What type of recursive method do you think would...Ch. 14 - Which repetition approach is less efficient: a...Ch. 14 - When recursion is used to solve a problem, why...Ch. 14 - How is a problem usually reduced with a recursive...Ch. 14 - Prob. 1PCCh. 14 - isMember Method Write a recursive boolean method...Ch. 14 - String Reverser Write a recursive method that...Ch. 14 - maxElement Method Write a method named maxElement,...Ch. 14 - Palindrome Detector A palindrome is any word,...Ch. 14 - Character Counter Write a method that uses...Ch. 14 - Recursive Power Method Write a method that uses...Ch. 14 - Sum of Numbers Write a method that accepts an...Ch. 14 - Ackermarms Function Ackermanns function is a...Ch. 14 - Recursive Population Class In Programming...
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- Pascal's triangle is a useful recursive definition that tells us the coefficients in the expansion of the polynomial (x + a)^n. Each element in the triangle has a coordinate, given by the row it is on and its position in the row (which you could call a column). Every number in Pascals triangle is defined as the sum of the item above it and the item above it and to the left. If there is a position that does not have an entry, we treat it as if we had a 0 there. *picture of the pascals triangle* Given the following recursive function signature, write the recursive function that takes a row and a column and finds the value at that position in the triangle. Assume that the triangle starts at row 0 and column 0. Examples: pascal(2, 1) -> 2, pascal(1, 2) -> 0 public int pascal(int row, int column) { }arrow_forwardJava language Write a recursive method to add all of the odd numbers between two numbers (start and end) and return the result. The method receives these numbers as parameters.arrow_forwardWhere do you see the advantages of using tail recursion?arrow_forward
- In what instances do you think it’s impractical to use recursion over loops?arrow_forwardWhat precisely does it imply when someone refers to something as a "ForkJoinTask"? How is RecursiveAction distinct from RecursiveTask, and what are some of the ways in which these two concepts are comparable to one another?arrow_forwardWhat are the basic components required to create a recursive method? How can you avoid creating an infinitely recursive method? In your post, also provide an example of how recursion can be used in a specific example.arrow_forward
- Explain the meaning of the recursion with a simple examplearrow_forwardWritten explaination requiredarrow_forward1. What is the difference between an iterative algorithm and a recursive algorithm? 2. What is a recursive algorithm’s base case? What is the recursive case? 3. What is the base case of each of the recursive methods listed in Algorithm Workbench 3, 4, and 5? 4. What type of recursive method do you think would be more difficult to debug: one that uses direct recursion or one that uses indirect recursion? Why? 5. Which repetition approach is less efficient: a loop or a recursive method? Why? 6. When recursion is used to solve a problem, why must the recursive method call itself to solve a smaller version of the original problem? 7. How is a problem usually reduced with a recursive method?arrow_forward
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