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

#define MACRO_0     0

#define MACRO_1     1

/* 10.1:    */

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

/*  1;  */

#if     a

    a;

#elif   MACRO_0

    MACRO_0;

#elif   MACRO_1         /* Valid block  */

    MACRO_1;

#else

    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