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Learn how to troubleshoot and fix your Java program that is not reversing a two-digit integer as intended. This guide provides clear explanations and solutions!
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This video is based on the question https://stackoverflow.com/q/70981096/ asked by the user 'Limbo' ( https://stackoverflow.com/u/13224990/ ) and on the answer https://stackoverflow.com/a/70981271/ provided by the user 'Zag' ( https://stackoverflow.com/u/2711384/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Your Java Program: Reversing a Two-Digit Integer

In the world of Java programming, it’s common to run into issues that can be quite perplexing. One common problem developers may face is trying to create a program that takes user input and processes that input in a particular way. For example, you might want to reverse a two-digit integer input by the user.

However, what if the program compiles successfully but only shows the first digit of the reversed number? Let's explore this problem, understand its causes, and discuss how to properly implement the solution.

The Issue

You may find yourself in a situation where your code successfully compiles, but it doesn't behave as expected. For example, suppose you want to reverse a two-digit number, like inputting 45 and getting 54. Instead, your program may output 5 only.

The Existing Code

Here’s a snippet of the code that is at the core of the issue:

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

This part of the code is supposed to reverse the integer, but it only subtracts the last digit and fails to include the first digit in the final output.

Analyzing What Went Wrong

The problem lies in the way the code was structured:

The intention was to reverse a two-digit integer, but the code only processes one iteration of reversing rather than fully reversing the number.

As a result, only the last digit is extracted and printed, which leads to the incorrect output.

Solution: Revising the Code

To correct this issue, we need to adjust the logic in the code to ensure that both digits of the number are reversed and combined properly. Here’s a corrected version of that code:

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

Explanation of the Fix

Extract Last Digit: The line int digit = num % 10; gets the last digit of the number.

Combine Digits: Instead of only reversing one digit at a time, we directly calculate the reversed number using int reversed = 10 * digit + num / 10;. This combines the last digit and the first digit.

Output: Finally, we print the correctly reversed number.

Conclusion

In conclusion, troubleshooting issues in your Java program can often lead to innovative solutions. By understanding the nature of the problem and correcting the logic in our code, we've successfully created a program capable of reversing a two-digit integer from the user input.

Next time your Java program isn't returning the expected output, refer back to this guide to help identify and solve similar issues. Happy coding!

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