How to Retrieve Line Numbers for Effective C/C Debugging?

Debugging with Line Numbers in C/C

In the realm of debugging, identifying the exact line where a problem arises can significantly streamline the process. For C/C compilers, preprocessor macros offer a convenient way to dynamically retrieve line numbers.

The LINE macro holds an integer representing the current line number. By incorporating it into an error message, you can automate the retrieval of the exact line where an issue occurred. For instance:

<code class="c++">if(!Logical) {
    printf("Not logical value at line number %d \n", __LINE__);
}</code>

In addition to the line number, you may also want to include the file name. The FILE macro provides access to the current file name.

<code class="c++">if(!Logical) {
    printf("Not logical value at line number %d in file %s\n", __LINE__, __FILE__);
}</code>

This can be particularly useful when debugging code from multiple source files.

Here's a list of additional preprocessor macros that can be used for debugging:

• __func__: The current function name (not supported by all C compilers)
• __DATE__: A string representing the compilation date
• __TIME__: A string representing the compilation time

By utilizing these macros, you can create more informative error messages that pinpoint the exact location of any debugging issues.

The above is the detailed content of How to Retrieve Line Numbers for Effective C/C Debugging?. For more information, please follow other related articles on the PHP Chinese website!