Eroare de compilare: user.cpp:4:15: error: math: No such file or directory user.cpp:38:2: warning: no newline at end of file user.cpp: In function 'int main()': user.cpp:8: error: 'ifstream' was not declared in this scope user.cpp:8: error: expected `;' before 'f' user.cpp:8: error: 'ofstream' was not declared in this scope user.cpp:8: error: expected `;' before 'g' user.cpp:9: error: 'f' was not declared in this scope user.cpp:35: error: 'g' was not declared in this scope