How to Retrieve Line Numbers During C/C Debugging?

Line Number Retrieval in C/C

Debugging processes often require precise identification of the source line where an issue occurs. In C/C , determining line numbers is crucial for efficient debugging.

Standard Solution: Preprocessor Macros

To dynamically obtain the line number without manual input, C/C offers the preprocessor macros LINE and __FILE__. These macros are predefined and recognized by the compiler during preprocessing.

• __LINE__: Stores the current line number as an integer constant.
• __FILE__: Contains the current file name.

Code Example

Utilizing these macros, you can modify your code to dynamically include the line number and file name:

if (!Logical) {
  printf("Not logical value at line number %d in file %s\n", __LINE__, __FILE__);
}

This modified code will print the line number and file name where the logical validation fails.

Additional Macros

C/C also provides additional preprocessor variables that can be helpful for debugging:

• __func__: Holds the currently executing function name (supported in C99, but not all C compilers).
• __DATE__: Represents the compilation date in the format "MMM dd yyyy".
• __TIME__: Provides the compilation time in the format "hh:mm:ss".

Including these macros in debug printouts can enhance the information available for troubleshooting. Implementing these techniques will significantly improve the efficiency of your C/C debugging efforts.

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