Detailed explanation of C++ function debugging: How to use breakpoints and watchpoints?

Detailed explanation of C function debugging Mastering breakpoints and watchpoints can effectively debug code: breakpoints: pause the program at a specific location when the code is executed; watchpoints: trigger a pause when the variable value changes. Use breakpoints to execute code line by line and watchpoints to monitor variable changes. Use breakpoints with watchpoints for deeper debugging capabilities. It is recommended to use an effective debugger, set meaningful breakpoints, use conditional breakpoints and watchpoints, and avoid redundant breakpoints.

Detailed explanation of C function debugging: mastering the skills of breakpoints and watchpoints

Introduction

Debugging code is A critical part of the software development cycle, breakpoints and watchpoints are powerful debugging tools in C. This article will delve into how to effectively use breakpoints and watchpoints to find and fix defects in your program.

Breakpoint

• What is a breakpoint? A breakpoint is a specific location at which the computer will pause while code is executing.
• How to set breakpoints? Right-click on the code line number in the editor and select "Set Breakpoint".
• Practical case: To find the loop error that caused the crash, you can set a breakpoint in the loop to view variable values ​​and thread status.

Observation Point

• What is an observation point? Watchpoints are tools that trigger a pause when the value of a specific variable or expression changes.
• How to set the observation point? Right-click the variable in the Observation window and select New Observation Point.
• Practical case: To monitor whether a pointer with a value of zero is dereferenced, you can set a watchpoint on the pointer and pause execution immediately when the value changes.

Debugging using breakpoints and watchpoints

• Use breakpoints to step through the code line by line: Set breakpoints and Execute the code step by step, checking variable values ​​and identifying the location of the error.
• Use watchpoints to monitor changes to variables: Watchpoints can quickly detect value changes and help you identify the code path causing the problem.
• Use breakpoints and watchpoints together: Use breakpoints and watchpoints together for deeper debugging capabilities.

Best Practices

• Use a valid debugger: Debuggers such as Visual Studio or GDB provide settings Powerful interface for breakpoints and watchpoints.
• Set meaningful breakpoints: Set breakpoints only on lines of code that help solve the problem.
• Use conditional breakpoints and watchpoints: A breakpoint or watchpoint is only triggered when specific conditions are met.
• Avoid redundant breakpoints: Set only necessary breakpoints to avoid affecting debugging performance.

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