Eroare de compilare: user.cpp:1:21: error: fstream.h: No such file or directory user.cpp: In function ‘int main()’: user.cpp:27: error: expected ‘,’ or ‘;’ before ‘ifstream’ user.cpp:28: error: ‘ofstream’ was not declared in this scope user.cpp:28: error: expected ‘;’ before ‘out’ user.cpp:29: error: ‘in’ was not declared in this scope user.cpp:29: error: ‘a’ was not declared in this scope user.cpp:29: error: ‘b’ was not declared in this scope user.cpp:31: error: ‘i’ was not declared in this scope user.cpp:33: error: ‘nd’ was not declared in this scope user.cpp:41: error: ‘out’ was not declared in this scope user.cpp:26: warning: unused variable ‘j’