Скачать или смотреть How to Create a Singly-Linked List with a Locally Declared Head in C+ +

Learn how to effectively create and manipulate a `singly-linked list` using a locally declared head pointer in C+ + . We explain the concept and dive into practical examples to guide you through the implementation.
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This video is based on the question https://stackoverflow.com/q/62303657/ asked by the user 'Josip Maričević' ( https://stackoverflow.com/u/10711348/ ) and on the answer https://stackoverflow.com/a/62304578/ provided by the user 'Vlad from Moscow' ( https://stackoverflow.com/u/2877241/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Singly-Linked Lists with a Locally Declared Head in C+ +

Singly-linked lists are a fundamental data structure in computer science, allowing for dynamic memory allocation and efficient insertion and deletion of elements. If you are accustomed to using global pointers for managing linked lists, you may find yourself struggling when switching to local pointers. In this post, we will explore how to create a single-linked list using a locally declared head pointer and effectively insert elements into it.

The Problem

You have previously worked with global pointers to manage linked lists but now need to switch to a local declaration. This shift raises a question: How do you use double pointers effectively, and when do you use *, **, and & operators?

To illustrate the solution, we will define a function to insert nodes into a singly-linked list and walk through the code step-by-step.

The Solution

Struct Definition

First, we need to define the structure for our list elements. Here’s how you can define a simple struct to represent each node in our linked list:

[[See Video to Reveal this Text or Code Snippet]]

This struct includes an integer data field x and a pointer to the next element in the list, next.

Inserting Nodes with a Local Head Pointer

Next, we must implement an insert function. Here's how the basic insert function looks:

[[See Video to Reveal this Text or Code Snippet]]

Utilizing a Local Pointer in main Function

Now that we have the insert function, we need to create a local pointer in the main function. Here’s how you declare and use the head pointer locally:

[[See Video to Reveal this Text or Code Snippet]]

Understanding Pointers and Memory Allocation

Let’s clarify when to use *, **, and &:

is used to declare pointer variables or dereference a pointer to access the value it points to.

** indicates a pointer to a pointer, which is essential for modifying the head pointer when passed to functions.

& is the address-of operator, which is used to pass the address of the pointer itself, allowing the function to update the pointer in the calling context.

Enhanced C+ + Implementation

If you wish to implement a more C+ + -like version, you could incorporate classes, which provide data encapsulation and better manage memory. Here’s a simple class-based implementation of a singly-linked list:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By properly understanding and applying double pointers along with the correct use of * and &, you can effectively create and manage a singly-linked list in C+ + . Whether you choose a C-style struct approach or a C+ + class-based implementation, the fundamental concepts remain the same.

If you have any questions or need further clarification, feel free to reach out! Happy coding!