Eroare de compilare: user.cpp:52:3: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:22: error: 'ifstream' was not declared in this scope user.cpp:22: error: expected `;' before 'be' user.cpp:23: error: 'ofstream' was not declared in this scope user.cpp:23: error: expected `;' before 'ki' user.cpp:24: error: 'be' was not declared in this scope user.cpp:29: error: 'strrev' was not declared in this scope user.cpp:46: error: 'ki' was not declared in this scope user.cpp:48: error: 'ki' was not declared in this scope user.cpp:49: error: 'ki' was not declared in this scope