Скачать или смотреть How to Efficiently Sort a Doubly Linked List in C+ + by Data and Alphabetically

Discover how to sort a C+ + doubly linked list by numeric data and alphabetical order. Step-by-step guide included!
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This video is based on the question https://stackoverflow.com/q/62941279/ asked by the user 'Razbolt' ( https://stackoverflow.com/u/13872249/ ) and on the answer https://stackoverflow.com/a/62942535/ provided by the user 'Manuel' ( https://stackoverflow.com/u/980129/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Sorting a Doubly Linked List in C+ + : Adding Nodes in Alphabetical Order and Value

Doubly linked lists are a powerful data structure used in various applications of programming. One common requirement when working with such lists is the ability to maintain order when adding new nodes. Specifically, in this guide, we will explore how to add nodes to a doubly linked list in C+ + while ensuring they are sorted both by their numeric data (value) and, when values are equal, by their associated string names in alphabetical order.

The Problem

Imagine you are tasked with creating a doubly linked list that stores a person's name as a string and some associated numeric data (like a score or age). When you add new nodes to this list, they must be placed in order based on their numeric data. If the numeric data is identical for two nodes, then the nodes should be ordered alphabetically by name.

Consider the following input values:

Christian 250

Tom 200

Alex 250

Your expected output from the sorted doubly linked list would be:

Alex 250

Christian 250

Tom 200

It's clear that you will need to implement a method that allows you to correctly compare and insert these values in the proper order.

Analyzing the Existing Code

In the provided code, you have a structure defined for the doubly linked list node. The insert function adds a new node, while the sorting function sorts the list based on the rules defined. Below is a simplified representation of the relevant parts of your code:

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

Issues in the Sorting Function

The main issue occurs in the sorting function where you attempt to compare node names using the strcmp function. However, C+ + provides standards for string comparisons using relational operators directly, which can simplify this process significantly.

Here’s the key line that needs modification:

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

The comparison operator here is not logical. You should be using < instead of = which results in logical errors during execution.

Revising the Sorting Logic

To sort the newly inserted node correctly, we can simply use the following logic within the sorting function:

Compare numeric data from both nodes.

If they are equal, compare their names directly using < for comparison.

Here is the corrected portion of your sorting function:

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

Implementation Tips

Use a Standard Comparison: Avoid using strcmp for C+ + strings and instead rely on the < and > operators.

Keep Your List Clean: Ensure that when nodes are swapped, both their data and names are switched accordingly to maintain the integrity of the list.

Test Thoroughly: Always test your code with various combinations of names and numbers to ensure your sorting logic is sound.

Conclusion

Sorting a doubly linked list by both numeric value and alphabetical order can be tricky, but with the right understanding of C+ + string comparisons and the double-linked list structure, it's manageable. The corrections provided above should help you set up your linked list as intended.

With careful application and testing of the concepts discussed, you'll be fully equipped to implement a functional doubly linked list in C+ + . Happy coding!