| #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 */ |