Eroare de compilare: user.cpp:1:21: error: fstream.h: No such file or directory user.cpp:2: error: ‘fstream’ does not name a type user.cpp:3: error: ‘ofstream’ does not name a type user.cpp: In function ‘bool prim(int)’: user.cpp:9: error: ‘sqrt’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:16: error: ‘f’ was not declared in this scope user.cpp:20: error: ‘g’ was not declared in this scope user.cpp:24: error: ‘g’ was not declared in this scope