You are a senior software developer on a team of software developers who are responsible for a large banking application. Your manager has learned that the code used for addition and subtraction over a series of steps will sometimes calculate incorrect results. The other developers have spent a lot of time tracing down the issue, and they narrowed it down to two functions: add numbers() and subtract numbers(). Following some guidance from an older testing guide, they isolated those functions in a standalone set of test cases. Doing this allows them to reliably show how to trigger an underflow or overflow. However, they don’t know what to do to prevent it from occurring in the future. They came to you for help.
You will learn to do the following:
- Detect when a numeric overflow or underflow is about to happen
- Write code to prevent the numeric overflow or underflow from happening
- Protect your code from underflow and overflow in any of the standard C/C++ data types
This assignment presents code that is designed to show the two functions operating with and without overflow or underflows. Using the existing source code, you will add logic to the add numbers() and subtract numbers() functions to detect, prevent, and notify the caller of a numeric overflow. You will also modify the calling test overflow and test underflow functions to be notified of success or failure of the add or subtract functions they call, and to modify them, the functions write to the console with overflow status (true or false) and the numeric result of the function.
The following are a few key notes:
- The source code has been commented with TODOs to explain the detailed rules you must follow.
- There are comments that mark code that must be changed.
- There may be more than one way to solve this problem, so be sure to demonstrate that you can detect an underflow or overflow, prevent it, and communicate it back to the calling function.
- Remember to leverage capabilities provided by the standard C++ library to help you achieve success.
Please comment on any changes you make in the code to explain the logic, formulas, or data types you are adding. You will also create a brief written summary of the approach taken. It should explain how this approach is designed to stop the overflow or underflow, any issues you encountered, and how you resolved those issues.
Specifically, you will prepare the following:
- Numeric overflow and underflow secure coding
- C/C++ program functionality and best practices
- A summary of your process in a Word document that contains a screenshot of the application console output
To complete this assignment, download the Numeric Overflow source code to use as guidance as you move through the activity. You will use your development environment to complete this activity.