Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:6:1: error: ‘ifstream’ was not declared in this scope ifstream input("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 ‘input’ ifstream input("prim.in"); ^ user.cpp:7:1: error: ‘ofstream’ was not declared in this scope ofstream output("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 ‘output’ ofstream output("prim.out"); ^ user.cpp:8:6: warning: statement has no effect [-Wunused-value] input>>k; ^ user.cpp:24:7: warning: statement has no effect [-Wunused-value] output<<b; ^