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Chapter 17: Problem 15

Predict what the output will be. ListNode *p \(=\) new ListNode (56.4); \(p=\) new ListNode \((34.2, p):\) ListNode *q \(=p->\) next cout \(\langle\langle q\text { -) value }\)

Short Answer

Expert verified
Answer: 56.4

Step by step solution

01

Understand the ListNode class

To understand the given code, we first need to know the ListNode class's structure. ListNode class has two members: a floating-point number 'value' and a pointer to the next ListNode object 'next'. The value of the ListNode is stored in 'value', while the pointer to the next ListNode is stored in 'next'.
02

Create a new ListNode object p

In this step, a new ListNode object 'p' with the value 56.4 is created. The syntax for this operation is: ListNode *p = new ListNode (56.4); At this point, the linked list only contains one element, pNode with value 56.4, and the next pointer is set to NULL since there's no next element initialized.
03

Add a new ListNode object with value 34.2 before p

The code adds another ListNode object with the value 34.2 before the existing ListNode object p. The syntax is: p = new ListNode (34.2, p); At this point, the linked list now contains two elements: pNode with value 34.2 pointing to the pNode with value 56.4.
04

Create a new ListNode pointer q and set it to point to the next element of p

Now, a new pointer 'q' is created and set to point to the next element of the ListNode object 'p'. This is done by setting q to the value of p->next. The syntax is: ListNode *q = p->next; At this point, the pointer q is pointing to the ListNode object with the value 56.4.
05

Output the value of ListNode pointed by q

The last step is to output the value of the ListNode that 'q' is pointing to. The syntax for this operation is: cout << q->value; Since q is pointing to the ListNode object with the value 56.4, the output will be 56.4. Final output: 56.4

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Most popular questions from this chapter

You are the leader of a programming team. You want the programmers on your team to attend a two-day workshop on linked lists, stacks and queues, One of the managers points out that the STL already supplies each one of those data structures, making it unnecessary for your programmers to write their own. Write the manager a short memo that justifies the need for the workshop.

To indicate that a linked list is empty, you should set the pointer to its "head" to the value ______.

Write a function ListNode *removeFirst(ListNode *ptr) that is passed a linked list as parameter, and returns the tail of the list: that is, it removes the first node and returns what is left. The function should deallocate the storage of the removed node. The function returns NULL if the list passed to it is empty.

Using the ListNode structure introduced in this chapter, write a function void printFirst(ListNode *ptr) that prints the value stored in the first node of a list passed to it as parameter. The function should print an error message and terminate the program if the list passed to it is empty.

A data structure that points to an object of the same type as itself is known as a(n) ________ data structure.
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