Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
4th Edition
ISBN: 9780134444321
Author: Tony Gaddis
Publisher: PEARSON
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Chapter 12, Problem 4MC
Program Plan Intro

Problem Solving:

In Python, a problem can be divided into smaller parts only if it has an identical structure to the whole problem. Then, it can be solved using recursion.

Working method of recursive function:

A recursive function has two approaches. They are as follows:

  • If a problem can be solved currently without using recursion, then use function to solve it and returns.
  • If a problem cannot be solved currently, then the function reduces the problem into smaller parts only if it has a similar structure to the whole program. And the function calls itself to solve the sub-parts.

Problem cases:

In order to apply the above approaches into the program for solving it, then it is important to identify the problem case. There are two cases that are available in problem solving. They are base case and recursive case.

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In a recursive solution, the _____ case is easily calculated, provides a stopping criterion, and prevents infinite loops. In the _____ case, the solution calls itself.
Recursive Power MethodWrite a method called powCal that uses recursion to raise a number to a power. The method should accept two arguments: The first argument is the exponent and the second argument is the number to be raised (example” powCal(10,2) means 210). Assume that the exponent is a nonnegative integer. Demonstrate the method in a program called Recursive (This means that you need to write a program that has at least two methods: main and powCal. The powCal method is where you implement the requirements above and the main method is where you make a method call to demonstrate how your powCal method work).
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Chapter 12 Solutions

Starting Out with Python (4th Edition)

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