Question

How to check if the C compiler standard is C99 in C

Answer 1

#include <stdio.h>
 
int main()
{
    printf("%ld\n", __STDC_VERSION__);
       
    if (__STDC_VERSION__ == 199901L) {
       puts("PREDEF_STANDARD_C_1999");
    }
}
 
 
 
/*
run:
 
199901
PREDEF_STANDARD_C_1999
 
*/

 

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