Question

How to check if the C implementation is C standard in C

Answer 1

#include <stdio.h>

int main(void)
{
    fprintf(stderr, "%d", __STDC__);
    
    return 0;
}


 
// If 1, the implementation is C Standard
    
/*
run:

1

*/

 

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Answer 2

#include <stdio.h>
 
int main(void)
{
    printf("%d", __STDC__);
     
}


  
// If 1, the implementation is C Standard
     
/*
run:
 
1
 
*/

 

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