Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:6:1: error: ‘ifstream’ was not declared in this scope ifstream i("prim.in"); ^ user.cpp:6:1: note: suggested alternative: In file included from /usr/local/include/c++/4.8.0/ios:38:0, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/local/include/c++/4.8.0/iosfwd:157:34: note: ‘std::ifstream’ typedef basic_ifstream<char> ifstream; ^ user.cpp:6:10: error: expected ‘;’ before ‘i’ ifstream i("prim.in"); ^ user.cpp:7:1: error: ‘ofstream’ was not declared in this scope ofstream o("prim.out"); ^ user.cpp:7:1: note: suggested alternative: In file included from /usr/local/include/c++/4.8.0/ios:38:0, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/local/include/c++/4.8.0/iosfwd:160:34: note: ‘std::ofstream’ typedef basic_ofstream<char> ofstream; ^ user.cpp:7:10: error: expected ‘;’ before ‘o’ ofstream o("prim.out"); ^ user.cpp:8:2: warning: statement has no effect [-Wunused-value] i>>k; ^ user.cpp:24:1: error: ‘output’ was not declared in this scope output<<b; ^