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Chapter 5: Problem 25

What general techniques can you use to determine the source of an error?

Short Answer

Expert verified
Question: List and briefly explain some general techniques that can be used to determine the source of an error in a program or algorithm. Answer: Some general techniques to determine the source of an error include: 1. Reading the error message for clues about the type of error and its location. 2. Reviewing the code and using debugging tools to identify problematic code lines or sections. 3. Testing the code with sample input and output values to compare expected and actual results. 4. Dividing the code into smaller parts and testing each part individually to locate the error. 5. Consulting documentation and online resources for potential grammar mistakes or incorrect usage. 6. Pair programming or peer review for a fresh perspective on the code. 7. Revisiting assumptions and requirements to ensure the code adheres to the problem statement.

Step by step solution

01

1. Carefully Read the Error Message

Firstly, always read the error message provided by the software or programming language. The message usually gives clues about the type of error and the line or part of the code where the error occurred. Try to understand the error message and find out what it is trying to indicate.
02

2. Code Review and Debugging

Review the code carefully, looking for any logical errors, syntax errors, or potential issues that might cause the error. Debugging tools, such as breakpoints and step-by-step execution, can help you identify the specific line or part of the code that is generating the error.
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3. Test with Sample Input and Output

Test the code with a valid range of input values and observe the output. Comparing the expected output against the actual output can help you uncover any potential issues.
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4. Divide and Conquer

Break down the program or algorithm into smaller parts or functions. Test each part individually to identify where the error might be originating. Once the problem part is identified, focus on resolving the issue within that specific part.
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5. Consult Documentation or Online Resources

Check the documentation for the programming language, library, or framework you are using. This may help you uncover any grammar mistakes, incorrect usage, or missing elements in your code. Additionally, refer to online resources or forums for discussions and possible solutions related to the error you are encountering.
06

6. Pair Programming and Peer Review

Work with a partner to go through the code together or ask a fellow programmer to review your code. Having a fresh perspective can often help uncover issues that you may have missed or didn't think about.
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7. Revisit Assumptions and Requirements

Go back to the original problem statement, requirements, or constraints and ensure that your code is adhering to them. Sometimes, the source of the error might stem from a misunderstanding or misinterpretation of the problem's requirements. Remember, finding the source of an error may require some trial and error. It's essential to be patient and persistent in your efforts to resolve the issue.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Error Message Interpretation
Understanding error messages is critical for debugging software. When faced with an error, it's tempting to jump straight into the code. However, the key is first to decipher what the error message is indicating.

For instance, a 'null pointer exception' often suggests the program is trying to access a memory location that hasn't been initialized. Interpreting such a message properly leads you down the right path to resolving the issue. It's like being a detective, where the error message is your first clue.
Code Review Process
The code review process involves methodically scrutinizing your code, a crucial step in debugging. Have you followed best practices? Are there any typos or syntax errors? It's not just about finding mistakes; it also includes looking for areas to optimize and make your code more efficient.

Imagine it as having a second pair of eyes, even if they're your own, to catch what you missed on the first pass. This process is greatly enhanced by pair programming or peer review, adding fresh perspectives to the code.
Software Testing Methods
Testing your software with a variety of inputs is essential. From unit tests that verify each piece of your code works correctly to integration tests that ensure all parts work together harmoniously, testing is a multifaceted tool.

Automated tests can simulate numerous scenarios swiftly, flagging any irregularities for you to inspect. This rigorous approach helps expose logical errors and corner cases that might not be immediately obvious.
Divide and Conquer Strategy
The divide and conquer strategy simplifies debugging by breaking the software down into manageable sections or functions. Isolate each segment and test them separately to pinpoint the error’s location.

Think of it like solving a jigsaw puzzle. You group the pieces by color or pattern to work on smaller sections of the puzzle, which is much easier than trying to solve it all at once.
Programming Documentation
Good programming documentation acts as a comprehensive manual to your code and the tools you’re using. It should answer 'how', 'what', and 'why' questions about your code. If an error occurs, documentation can often clarify proper syntax and usage or explain functions and libraries.

Just like a skilled cook would reference a recipe book, a savvy programmer uses documentation to ensure they are using the correct 'ingredients' in their code.
Pair Programming
Pair programming is a collaborative approach where two developers work together at one workstation. The 'driver' writes the code, while the 'observer' reviews each line as it's written. This real-time code review process fosters a deep understanding of the code through discussion and can lead to higher quality code with fewer bugs.

Collaborating in this way not only spreads knowledge but also offers immediate feedback, which is invaluable for catching errors early on.
Programming Problem Requirements
Each programming challenge comes with its own set of requirements. Errors can often arise from a misunderstanding of these stipulations. Revisiting the problem statement can shed light on constraints that were overlooked or misinterpreted.

Ensuring that your code precisely addresses the requirements is akin to confirming your map matches the terrain before embarking on a hike. By doing so, you ensure you're on the right track from the start.

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Most popular questions from this chapter

Are you required to have a return statement in a void function definition?

include void friendly( ); void shy(int audience_count); int main( ) { using namespace std; friendly( ); shy(6); … # What is the output of the following program? #include void friendly( ); void shy(int audience_count); int main( ) { using namespace std; friendly( ); shy(6); cout << "One more time:\n"; shy(2); friendly( ); cout << "End of program.\n"; return 0; } void friendly( ) { using namespace std; cout << "Hello\n"; } void shy(int audience_count) { using namespace std; if (audience_count < 5) return; cout << "Goodbye\n"; } The \(\mathrm{C}++\) Standard says that you can omit the return \(\theta\) in the main part, but many compilers still require it.

Can a function definition contain a call to another function?

Give a precondition and a postcondition for the predefined function sqrt, which returns the square root of its argument.

Can a function that returns a value have a call-by-reference parameter? May a function have both call-by-value and a call-by-reference parameters?
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