Eroare de compilare: user.cpp:1:20: error: fstream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:5: error: ‘ifstream’ was not declared in this scope user.cpp:5: error: expected ‘;’ before ‘f’ user.cpp:6: error: ‘ofstream’ was not declared in this scope user.cpp:6: error: expected ‘;’ before ‘h’ user.cpp:7: error: ‘f’ was not declared in this scope user.cpp:21: error: ‘h’ was not declared in this scope user.cpp:4: warning: unused variable ‘a’ user.cpp:4: warning: unused variable ‘c’