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. Imagine we have a linked list as shown below. The ListNode has two fields: num, n integer, and next, a pointer to the next node. The list is not sorted. Write the efinition of a function that calculates and returns the sum of the numbers in the list. pList

. Imagine we have a linked list as shown below. The ListNode has two fields: num, n integer, and next, a pointer to the next node. The list is not sorted. Write the efinition of a function that calculates and returns the sum of the numbers in the list. pList

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Imagine we have a linked list as shown below. The ListNodehas two fields: num, an integer, and next, a pointer to the next node. The list is not sorted. Write the definition of a function that calculates and returns the sum of the numbers in the list.

### Problem 4: Sum of Numbers in a Linked List Imagine we have a linked list as shown below. The `ListNode` has two fields: `num`, an integer, and `next`, a pointer to the next node. The list is not sorted. Write the definition of a function that calculates and returns the sum of the numbers in the list. #### Linked List Diagram The diagram depicts a singly linked list with four nodes: - The first node is referenced by `pList` and has a pointer to the next node. - The second node points to the third node. - The third node points to the fourth node. - The fourth node points to `NULL`, indicating the end of the list. ``` pList -> [num|next] -> [num|next] -> [num|next] -> [num|NULL] ``` #### Function Definition You need to define a function in a suitable programming language that will traverse this linked list and calculate the sum of all the `num` values in the nodes. Here's an example function definition in Python: ```python class ListNode: def __init__(self, num=0, next=None): self.num = num self.next = next def sum_of_list(pList): current = pList total_sum = 0 while current is not None: total_sum += current.num current = current.next return total_sum ``` This function initializes a sum as `0` and iterates through each node in the linked list, adding each node's `num` value to the sum. When it reaches the end of the list (i.e., `current` becomes `None`), the sum is returned.
Transcribed Image Text:### Problem 4: Sum of Numbers in a Linked List Imagine we have a linked list as shown below. The `ListNode` has two fields: `num`, an integer, and `next`, a pointer to the next node. The list is not sorted. Write the definition of a function that calculates and returns the sum of the numbers in the list. #### Linked List Diagram The diagram depicts a singly linked list with four nodes: - The first node is referenced by `pList` and has a pointer to the next node. - The second node points to the third node. - The third node points to the fourth node. - The fourth node points to `NULL`, indicating the end of the list. ``` pList -> [num|next] -> [num|next] -> [num|next] -> [num|NULL] ``` #### Function Definition You need to define a function in a suitable programming language that will traverse this linked list and calculate the sum of all the `num` values in the nodes. Here's an example function definition in Python: ```python class ListNode: def __init__(self, num=0, next=None): self.num = num self.next = next def sum_of_list(pList): current = pList total_sum = 0 while current is not None: total_sum += current.num current = current.next return total_sum ``` This function initializes a sum as `0` and iterates through each node in the linked list, adding each node's `num` value to the sum. When it reaches the end of the list (i.e., `current` becomes `None`), the sum is returned.
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