How to Retrieve Line Numbers for C/C Debugging?

How to Obtain Line Numbers for Debugging in C/C Compilers

In the context of debugging, retrieving the line number in C/C programs is crucial. This allows developers to pinpoint the specific locations of errors and bugs. There are several ways to achieve this, both using standard methods and compiler-specific approaches.

Standard Macros

The C/C standard defines two preprocessor macros that provide the necessary information:

• LINE: Expands to an integer representing the current line number.
• FILE: Expands to a string containing the current filename.

For example, the following code snippet utilizes these macros to print an error message with the line number and filename:

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

Compiler-specific methods may vary, but the above approach is widely supported and recommended for portability.

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