/* n_10.c:  #if, #elif, #else and #endif pp-directive.  */

#include    "defs.h"

#define MACRO_0     0

#define MACRO_1     1

main( void)

{

    fputs( "started\n", stderr);

/* 10.1:    */

/* Note: an undefined identifier in #if expression is replaced to 0.    */

#if     a

    assert( a);

#elif   MACRO_0

    assert( MACRO_0);

#elif   MACRO_1         /* Valid block  */

    assert( MACRO_1);

#else

    assert( 0);

#endif

/* 10.2: Comments must be processed even if in skipped #if block.   */

/* At least tokenization of string literal and character constant is necessary

        to process comments, e.g. /* is not a comment mark in string literal.

 */

#ifdef  UNDEFINED

    /* Comment  */

    "in literal /* is not a comment"

#endif

    fputs( "success\n", stderr);

    return  0;

}