Question

How to write specific code if the version is C99 in C

Answer 1

#include <stdio.h>

#if __STDC_VERSION__ == 199901L
#define C99
#endif

int main()
{
#ifdef C99
	puts("C99");
#else
	puts("not c99");
#endif
}



/*
run:

C99

*/

 

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Answer 2

#include <stdio.h>

int main()
{
    printf("%ld\n", __STDC_VERSION__);
      
    if (__STDC_VERSION__ == 199901L) {
       puts("Code for C99");
    }
}



/*
run:

199901
Code for C99

*/

 

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