/* n_15.c:  #ifdef, #ifndef directives. */

#include    "defs.h"

#define MACRO_0     0

#define MACRO_1     1

main( void)

{

    fputs( "started\n", stderr);

/* 15.1:    #ifdef directive.   */

#ifdef  MACRO_1     /* Valid block  */

    assert( MACRO_1);

#else

    assert( MACRO_0);

#endif

/* 15.2:    #ifndef directive.  */

#ifndef MACRO_1

    assert( MACRO_0);

#else               /* Valid block  */

    assert( MACRO_1);

#endif

    fputs( "success\n", stderr);

    return  0;

}