Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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![Code Listing 15.1 (Recursive.java)
/**
This program demonstrates factorials using recursion.
*/
public class Recursion
{
public static void main (String[] args)
int n = 7;
// Test out the factorial
System.out.println (n + " factorial equals ");
System.out.println (Recursion.factorial (n));
System.out.println ();
Copyright © 2019 Pearson Education, Inc., Hoboken NJ
/**
This is the factorial method.
@param n A number.
@return The factorial of n.
*/
public static int factorial (int n)
{
int temp;
if (n --= 0)
return 1;
else
{
return (factorial (n - 1) * n);
}](https://content.bartleby.com/qna-images/question/80ef9356-ef7e-4ed0-8ed6-e76b98efab1d/87daf093-3c60-47ca-8958-e625a0ffa735/ubzxuqf_processed.jpeg)
Transcribed Image Text:Code Listing 15.1 (Recursive.java)
/**
This program demonstrates factorials using recursion.
*/
public class Recursion
{
public static void main (String[] args)
int n = 7;
// Test out the factorial
System.out.println (n + " factorial equals ");
System.out.println (Recursion.factorial (n));
System.out.println ();
Copyright © 2019 Pearson Education, Inc., Hoboken NJ
/**
This is the factorial method.
@param n A number.
@return The factorial of n.
*/
public static int factorial (int n)
{
int temp;
if (n --= 0)
return 1;
else
{
return (factorial (n - 1) * n);
}
Transcribed Image Text:Task #1 Tracing Recursive Methods
1. Copy the file Recursion.java (see Code Listing 16.1) from the Student Files or
as directed by your instructor.
2. Run the program to confirm that the generated answer is correct. Modify the
factorial method in the following ways:
a. Add these lines above the first if statement:
int temp;
System.out.println ("Method call
"calculating
"Factorial of: " + n);
Copyright © 2019 Pearson Education, Inc., Hoboken NJ
b. Remove this line in the recursive section at the end of the method:
return (factorial(n - 1) * n);
c. Add these lines in the recursive section:
temp - factorial (n - 1) ;
System.out.println ("Factorial of: " +
(n - 1) + " is " +
temp);
return (temp * n);
3. Rerun the program and note how the recursive calls are built up on the run-time
stack and then the values are calculated in reverse order as the run-time stack
"unwinds".
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