Скачать или смотреть How to Fix an Infinite Loop in Your JavaScript Calculator Program

Learn how to solve the issue of infinite loops in JavaScript with a simple solution for a basic calculator program using recursion instead of a while loop.
---
This video is based on the question https://stackoverflow.com/q/64665826/ asked by the user 'Shubham Singh' ( https://stackoverflow.com/u/14571159/ ) and on the answer https://stackoverflow.com/a/64667469/ provided by the user 'Akanksha singh' ( https://stackoverflow.com/u/10390549/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Control is not stopping to take input and it is running in infinite loop

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding Infinite Loops in JavaScript

Have you ever faced a situation where your JavaScript program seems to be running endlessly without stopping for user input? This can be frustrating, especially if you're trying to implement a simple application like a calculator. In this guide, we'll explore a common issue related to infinite loops and how to resolve it effectively.

The Problem: Infinite Loop in Your Calculator

Imagine writing a basic calculator program in JavaScript that allows users to perform various mathematical operations, such as addition, subtraction, multiplication, and division. The goal is to let the user input numbers and perform operations repeatedly until they decide to exit the program. However, if your program is stuck in an infinite loop, you won't be able to receive input effectively. This issue commonly arises when using a while loop that never ends due to the condition used.

Example of the Limitations

In the provided example, the calculator program is designed to continuously prompt users for input:

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

The use of while(1) creates an infinite loop because the condition (which is always true) never changes. As a result, the program does not wait for user input as intended.

The Solution: Using Recursion

A more effective way to allow repeated user input without causing an infinite loop is to use recursion. This allows the program to call the same function again after processing the inputs instead of relying on a while statement. Here’s how you can implement it step-by-step:

Step-by-Step Implementation

Remove the Infinite While Loop: Eliminate the while(1) loop from your code.

Create a Recursive Function: Define a new function that handles user input and calls itself to continue the process until the user decides to exit.

Handle User Input in a Cleaner Way: Process the user's choice and execute the corresponding mathematical function.

Example Code

Here's how the revised code would look with these modifications:

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

Explanation of the Revised Code

Recursive Function: takeInputs() handles both number inputs and the user's choice. After processing the choice, it calls itself to ask for new inputs again.

Seamless User Experience: The transition between inputs is smooth, and the user can perform multiple operations without being interrupted by an infinite loop.

Error Handling: The onErr function manages errors effectively, providing feedback to users in case of invalid input.

Conclusion

By switching from an infinite loop to a recursive function, you can enhance the usability of your JavaScript calculator. This approach not only makes the code cleaner but also eliminates the issue of the program failing to pause for user input. So next time you encounter an infinite loop, consider using recursion for a more elegant solution!

Now that you're equipped with this knowledge, give it a try in your own projects. Happy coding!