Explicitely define which version of the C standard you are aiming at.

[branlix3000]

Hello,

I would like to know which version of the C standard your code is written for.

Is it ANSI C? C99? C11?

You can use pre-defined macro like __STDC__ or __STDC_VERSION__.

For more information, see:

• GCC manual — Section 3.7.1 Standard Predefined Macros
• Pre-defined Compiler Macros wiki
• Don Eric Heller’s CMPSC 311, Introduction to Systems Programming, “The C Standard” lecture — CStandard.c, and CStandard.h. Other files are available in the same directory.
• Dan Saks’s “‘New’ Features in C” lecture from 2019

Best regards.