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 ‘int main()’: user.cpp:12: error: ‘ii’ was not declared in this scope user.cpp:20: error: ‘abs’ was not declared in this scope user.cpp:24: error: ‘oo’ was not declared in this scope