Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:18:18: warning: unused variable ‘len’ [-Wunused-variable] int maxlen = 7, len, j; ^ user.cpp:18:23: warning: unused variable ‘j’ [-Wunused-variable] int maxlen = 7, len, j; ^ user.cpp:19:7: warning: unused variable ‘zeroused’ [-Wunused-variable] bool zeroused; ^