Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:5:9: error: ‘ifstream’ was not declared in this scope ifstream cin("drepte2.in"); ^ user.cpp:5:9: note: suggested alternative: In file included from /usr/include/c++/4.8/ios:38:0, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/iosfwd:157:34: note: ‘std::ifstream’ typedef basic_ifstream<char> ifstream; ^ user.cpp:5:18: error: expected ‘;’ before ‘cin’ ifstream cin("drepte2.in"); ^ user.cpp:6:9: error: ‘ofstream’ was not declared in this scope ofstream cout("drepte2.out"); ^ user.cpp:6:9: note: suggested alternative: In file included from /usr/include/c++/4.8/ios:38:0, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/iosfwd:160:34: note: ‘std::ofstream’ typedef basic_ofstream<char> ofstream; ^ user.cpp:6:18: error: expected ‘;’ before ‘cout’ ofstream cout("drepte2.out"); ^ user.cpp:8:9: error: ‘cin’ was not declared in this scope cin>>n; ^ user.cpp:8:9: note: suggested alternative: In file included from user.cpp:1:0: /usr/include/c++/4.8/iostream:60:18: note: ‘std::cin’ extern istream cin; /// Linked to standard input ^ user.cpp:10:19: error: ‘cout’ was not declared in this scope if (n==0) cout<<"1"; ^ user.cpp:10:19: note: suggested alternative: In file included from user.cpp:1:0: /usr/include/c++/4.8/iostream:61:18: note: ‘std::cout’ extern ostream cout; /// Linked to standard output ^ user.cpp:11:14: error: ‘cout’ was not declared in this scope else cout<<2*n; ^ user.cpp:11:14: note: suggested alternative: In file included from user.cpp:1:0: