Eroare de compilare: user.cpp:1:20: error: fstream.h: No such file or directory user.cpp:4: error: ‘ifstream’ does not name a type user.cpp:5: error: ‘ofstream’ does not name a type user.cpp: In function ‘void citire()’: user.cpp:19: error: ‘fin’ was not declared in this scope user.cpp:17: warning: unused variable ‘pr’ user.cpp: In function ‘int evaluare(nod*)’: user.cpp:114: warning: unused variable ‘aux’ user.cpp: In function ‘int main()’: user.cpp:142: error: ‘fout’ was not declared in this scope