Eroare de compilare: user.cpp: In function ‘void insert()’: user.cpp:6: error: ‘f’ was not declared in this scope user.cpp:6: error: ‘a’ was not declared in this scope user.cpp:6: error: ‘poz’ was not declared in this scope user.cpp:7: error: ‘chg’ was not declared in this scope user.cpp: At global scope: user.cpp:10: error: variable or field ‘chg’ declared void user.cpp:10: error: ‘poz1’ was not declared in this scope