How to Add a float Variable with an int Variable in Java

Publicado el: 27 septiembre 2025
en el canal de: vlogize

Discover how to properly add `float` and `int` variables in Java, ensuring accurate calculations for your applications.
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This video is based on the question https://stackoverflow.com/q/63516135/ asked by the user 'Fernando Ferreira' ( https://stackoverflow.com/u/14122848/ ) and on the answer https://stackoverflow.com/a/63516319/ provided by the user 'Sagar Gangwal' ( https://stackoverflow.com/u/5809720/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding How to Add a float Variable with an int Variable in Java

As a beginner learning Java, it's great to take on exercises that help you understand programming concepts better. One common problem arises when adding a float (or double) variable to an int variable, particularly when it comes to ensuring the output accurately represents the sum of these two types.

The Problem

You are trying to write a Java program that calculates the total amount of a bill, including interest. The issue you encountered is with the output not displaying the expected sum properly. For example, when you input a bill of 100 dinheiros and an interest of 25, your program mistakenly returns 100.025.0 dinheiros! instead of the correct 125 dinheiros.

Why This Happens

The problem arises from how you're combining the values for output. In Java, when you concatenate strings with numbers using the + operator, it treats everything as a string, which can lead to unexpected outputs. Specifically, if you do not properly group the expressions, Java will not calculate the sum before converting it to a string.

Solution Explained

Here’s how to fix the issue in your code:

Use a Single Scanner Instance: Creating multiple scanner instances is unnecessary and can lead to confusion. Create it just once and reuse it.

Grouping the Calculation: When you want to display the total amount, ensure to encapsulate the addition in parentheses. This ensures that the bill and interestCalculated are summed first before converting to a string.

Corrected Code

Here’s a modified version of your code that addresses the issues:

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

Example Output

When you run the corrected program, it provides the following output for inputs of 100 for the bill and 25 for interest:

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

Conclusion

By understanding how Java handles variable types and string concatenation, you can ensure your program provides accurate calculations. In this case, enclosing your calculations in parentheses was key to getting the correct output. As you continue learning, don’t hesitate to experiment and seek help when necessary. Happy coding!

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