#ifdef CHECK_VARIABLE_EXISTS | |
extern int CHECK_VARIABLE_EXISTS; | |
# ifdef __CLASSIC_C__ | |
int main() | |
{ | |
int ac; | |
char* av[]; | |
# else | |
int main(int ac, char* av[]) | |
{ | |
# endif | |
if (ac > 1000) { | |
return *av[0]; | |
} | |
return CHECK_VARIABLE_EXISTS; | |
} | |
#else /* CHECK_VARIABLE_EXISTS */ | |
# error "CHECK_VARIABLE_EXISTS has to specify the variable" | |
#endif /* CHECK_VARIABLE_EXISTS */ |