| #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 */ |