Creating a Discount Calculator in C

Описание: Learn how to build a simple discount calculator in C language. Understand the logic behind user input and get correct discounted prices with this easy-to-follow guide.
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This video is based on the question https://stackoverflow.com/q/62970976/ asked by the user 'Sowmo0509' ( https://stackoverflow.com/u/13954183/ ) and on the answer https://stackoverflow.com/a/62970997/ provided by the user 'Abhishek Bhagate' ( https://stackoverflow.com/u/13602076/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Discount Calculator in C: A Step-by-Step Guide

Are you trying to develop a discount calculator in C but are running into issues? Building a program that calculates discounts can be a useful project, whether for learning or practical purposes. In this guide, we’ll guide you through creating a straightforward discount calculator and addressing common pitfalls along the way.

The Problem

You want to create a discount calculator function that can take user input for the total price and the discount percentage, then calculate the final price after the discount is applied. However, you encountered an error in your code, specifically in the way you are handling user input for float values.

What Went Wrong

In your original code, you are using the format specifier %d for reading float values from user input. This is incorrect, as %d is meant for integers. The correct format specifier to read float values in C is %f.

Step-by-Step Solution

Let’s break down the solution into clear sections and correct your code.

1. Define the Discount Function

You’ve created a function named getDiscountedPrice that calculates the discounted price. Here’s the logic:

First, calculate the amount of discount by taking the percentage of the total price.

Then, subtract that discount from the total price to get the final price.

Here is the original function you wrote:

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

This part of the code is correct and does not require any modifications.

2. Fix the Main Program

You need to ensure that the user input is correctly handled. Instead of using %d, we'll change it to %f for float values. Here’s the corrected version of the main function:

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

3. Full Working Code

Here’s the complete code now that incorporates the changes we discussed:

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

Conclusion

Congratulations! You now have a functioning discount calculator written in C. By simply replacing the incorrect format specifier %d with %f, the issues in your program have been resolved.

When writing programs that involve decimal numbers, always remember to use the correct format specifiers to avoid runtime errors or incorrect calculations.

Feel free to use this template and further improve or customize the calculator to meet your needs!

With this knowledge, you can confidently develop more complex programs in C, paving the way for deeper learning in programming. Happy coding!