Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:9: error: ‘fistream’ was not declared in this scope user.cpp:9: error: expected ‘;’ before ‘fout’ user.cpp:14: error: ‘strlen’ was not declared in this scope user.cpp:62: error: ‘fout’ was not declared in this scope user.cpp:70: error: ‘strlen’ was not declared in this scope user.cpp:91: error: ‘sort’ was not declared in this scope