Eroare de compilare: 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:9: error: ‘ofstream’ was not declared in this scope user.cpp:9: error: expected ‘;’ before ‘g’ user.cpp:10: error: ‘f’ was not declared in this scope user.cpp:17: error: ‘sqrt’ was not declared in this scope user.cpp:24: error: ‘g’ was not declared in this scope user.cpp:24: error: ‘exit’ was not declared in this scope user.cpp:33: error: ‘modf’ was not declared in this scope user.cpp:34: error: ‘abs’ was not declared in this scope user.cpp:35: error: ‘abs’ was not declared in this scope user.cpp:51: error: ‘g’ was not declared in this scope user.cpp:51: error: ‘endl’ was not declared in this scope