20011106-2.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Test the the type of a component of a conditional expression between
   two structures is correct.  */
/* Origin: Joseph Myers <[e-mail]>.  */

struct s { char c; } a, b;
int c;
char x[sizeof ((c ? a : b).c) == 1 ? 1 : -1];