Detailed explanation of C++ function debugging: How to use the debugger to locate problems?

Using the debugger to locate problems is the key to debugging C functions. The specific steps are: set breakpoints to pause execution. Step through code to view variable values ​​line by line. Check the variable to see the value and type. Use a call stack to display a sequence of function calls. By following these steps, you can effectively debug functions, identify errors, and improve code quality.

Detailed explanation of C function debugging: a guide to using the debugger to locate problems

In C development, function debugging is to solve errors and key to performance issues. Mastering using the debugger to locate problems is critical to improving code quality and avoiding frustration.

Using the debugger

Modern debuggers provide a variety of features that can help you debug functions:

• Breakpoints: In the code Set a flag in so that execution pauses when it reaches that point.
• Single-step execution: Execute the code line by line and view changes in variable values.
• Check variables: Check the value and type of variables in the function.
• Call stack: Displays the currently executed function call sequence.

Set a breakpoint

To set a breakpoint, you can click the gray area next to the line number in the code editor, or use the debugger's Set Breakpoint button. At a breakpoint, execution is paused and you can inspect variables and see how your code behaves at runtime.

Single-step execution

Single-step execution allows you to view the execution of the code step by step. You can do this using the debugger's Step button or keyboard shortcuts.

Check Variables

To check variables, you can use the debugger's variable watch window. This window displays the values ​​of all declared variables in the function. You can also add variables to watchlists to track changes in their values ​​during code execution.

Call stack

The call stack displays the currently executed function call sequence. It allows you to understand the execution flow of your code and identify function calls that may be causing problems.

Practical Case

Consider the following example function:

int add(int a, int b) {
  int sum = a + b;
  return sum;
}

To debug this function, you can:

1. In return Set a breakpoint before the statement.
2. Single-step through the code.
3. Check the variables a, b and sum.
4. Verify that sum contains the expected value.

Using the debugger, you can identify and resolve any issues that cause incorrect results.

Conclusion

By using a debugger, you can effectively debug C functions, identify errors, and improve the quality of your code. By following the steps in this article and using the provided practical examples, you can become a proficient debugger, thereby simplifying your development process.

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