Eroare de compilare: user.cpp:1:20: error: fstream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:7: error: ‘ifstream’ was not declared in this scope user.cpp:7: error: expected ‘;’ before ‘in’ user.cpp:8: error: ‘ofstream’ was not declared in this scope user.cpp:8: error: expected ‘;’ before ‘out’ user.cpp:9: error: ‘in’ was not declared in this scope user.cpp:11: error: ‘sqrt’ was not declared in this scope user.cpp:25: error: ‘out’ was not declared in this scope