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Learn how to implement a dynamic array in C++ using pointers and memory management, without relying on vectors. This guide explains how to handle dynamic input effectively.
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How to Create a Dynamic Array in C++ Without Using Vectors

When working with arrays in C++, you might encounter situations where the size of your array isn't known at compile time. While vectors are commonly used in such cases because of their dynamic nature, what if you need to manage a dynamic array without using vectors? In this guide, we will explore how to achieve this using pointers and manual memory management.

The Problem Statement

You are tasked with writing a C++ program that takes a list of integers as input. The first integer specifies how many integers to read next. After that, you need to read two more integers representing the lower and upper bounds of a range. The program should then output all integers from the input list that fall within this specified range (inclusive), separated by commas and ending with a newline.

The Challenge

The main complication is that C++ does not support variable-length arrays in the traditional sense. As such, you need to create a dynamically allocated array based on user input.

Solution Breakdown

Let's go through the necessary steps to achieve a solution without using vectors.

Step 1: Dynamically Allocate an Array

You can use the new operator to create an array of integers based on the input size specified by the user. Here's a basic skeleton of how to do this:

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Step 2: Input the Integer Values

Next, you will need to populate the dynamically allocated array with values:

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Step 3: Filter and Output Values Within Range

Now that we have the array populated, we can loop through it to find integers within the defined bounds and print them:

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Complete Example

Combining all the steps mentioned, here is the full working example:

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Important Notes

Memory Management: When using new, it is crucial to release the allocated memory with delete[] to avoid memory leaks.

Alternative Solutions: While this direct use of new and delete is educational, consider using smart pointers (like std::unique_ptr) for better safety and memory management. This way, you wouldn’t have to worry about manual deallocation:

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

Conclusion

Creating a dynamic array in C++ without using vectors is feasible with manual memory management techniques like new and delete. While you may prefer using vectors for their built-in functionality, understanding manual dynamic allocation is a valuable skill that enhances your grasp of how memory management works in C++.

By following the guidelines laid out in this post, you should now be able to handle dynamic arrays confidently in your C++ programs. Happy coding!