Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:A learn.zybooks.com
zy Section 13.4 - CSC 1351: Compu
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omputer Science |l for Majors home > 13.4: Recursive Helper Methods
PARTICIPATION
13.4.3: Compute recursively to determine the sum of values in an array.
АCTIVITY
Assume you have the following method:
public static int sum(int[] a)
To compute the sum of the values in an array, add the first value to the sum of the remaining values, computing recursively.
Rearrange the following lines to design a recursive helper method to solve this problem.
Not all lines are useful.
Mouse: Drag/drop
Keyboard: Grab/release Spacebar (or Enter). Move O00 Cancel Esc
Unused
FindSum.java
Load default template..
return sumHelper(a, 0);
return a[start] + sumHelper(a, start - 1);
return alstart] + sumHelper(a, start + 1);
public static int sumHelper(int [] a, int start)
if (start == a.length) { return a[start]; }
if (start == a. length - 1) {return a[start]; }
if (a.length == 0) { return -1; }
public static void main (String [] args)
if (a.length == 0) { return 0; }
Scanner in = new Scanner(System.in);
int size = in.nextInt();
int [] myArray = new int[size];
for (int i = 0; i < size; i++)
myArray [i] = in.nextInt();
System.out.println(sum(myArray));
Check
Feedback?
PARTICIPATION
13.4.4: Produce a recursive method without using either a loop or a recursive helper method.
АCTIVITY
Rearrange the following lines of code to produce a recursive method:
public static int sum(Arraylist<Integer> a)
MacBook Pro
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Transcribed Image Text:nputer Science I| for Majors home > 13.4: Recursive Helper Methods
E zyBa
Feedb
PARTICIPATION
13.4.3: Compute recursively to determine the sum of values in an array.
АCTIVITY
Assume you have the following method:
public static int sum(int [] a)
To compute the sum of the values in an array, add the first value to the sum of the remaining values, computing recursively.
Rearrange the following lines to design a recursive helper method to solve this problem.
Not all lines are useful.
Mouse: Drag/drop
Keyboard: Grab/release Spacebar (or Enter). Move 0000 Cancel Esc
Unused
FindSum.java
Load default template..
return a[start] + sumHelper(a, start - 1);
import java.util.Scanner;
return alstart] + sumHelper(a, start + 1);
public class FindSum
{
if (start == a. length) { return a[start); }
if (start == a.length - 1) { return alstart]; }
public static int sum(int[0 a)
if (a.length == 0) { return -1; }
return sumHelper(a, 0);
if (a.length == 0) { return 0; }
public static int sumHelper(int [] a, int start)
public static void main (String [] args)
Scanner in = new Scanner(System.in);
int size = in.nextInt();
int [] myArray = new int[sizel;
for (int i = 0; i < size; i++)
Check
Feedback?
PARTICIPATION
ACTIVITY
13.4.4: Produce a recursive method without using either a loop or a recursive helper method.
code to produce a recursive method
MacBook Pro
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23
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&
4
7
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