Borderou de evaluare (job #534367)

Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:10:5: error: reference to ‘cin’ is ambiguous user.cpp:4:10: error: candidates are: std::ifstream cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:12:12: error: reference to ‘cin’ is ambiguous user.cpp:4:10: error: candidates are: std::ifstream cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:17:16: error: ‘ok’ was not declared in this scope user.cpp:16:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] user.cpp:24:1: error: reference to ‘cout’ is ambiguous user.cpp:5:10: error: candidates are: std::ofstream cout /usr/include/c++/4.6/iostream:62:18: error: std::ostream std::cout