18 lines · c
1#pragma clang system_header2 3namespace std {4class istream {5public:6 bool is_eof();7 char get_char();8};9 10istream &operator>>(istream &is, char &c) {11 if (is.is_eof())12 return;13 c = is.get_char();14}15 16extern istream cin;17};18