Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:7: error: ‘fopen’ was not declared in this scope user.cpp:9: error: ‘fgets’ was not declared in this scope user.cpp:10: error: ‘strlen’ was not declared in this scope user.cpp:14: warning: suggest parentheses around ‘&&’ within ‘||’ user.cpp:21: error: ‘strlen’ was not declared in this scope user.cpp:21: error: ‘fprintf’ was not declared in this scope