Eroare de compilare: user.cpp:1:20: error: fstream.h: No such file or directory user.cpp:2: error: ‘ifstream’ does not name a type user.cpp:3: error: ‘ofstream’ does not name a type user.cpp: In function ‘void build()’: user.cpp:39: error: ‘in’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:72: error: ‘out’ was not declared in this scope