Is there a #define for C99?

Question

I want to do something in C99 one way, otherwise to perform it another way. What is the #define to check for?

#ifdef C99
...
#else
...
#endif
         


        

Answer 1

#if __STDC_VERSION__ == 199901L
/* C99 */
#else
/* not C99 */
#endif

Change == to >= if you want to test for C99 and later.