Compilare: user.cpp: In function ‘int main()’: user.cpp:41:15: warning: variable ‘nrb’ set but not used [-Wunused-but-set-variable] int q,nra,nrb,nrc,nrd,sum; ^ user.cpp:41:19: warning: unused variable ‘nrc’ [-Wunused-variable] int q,nra,nrb,nrc,nrd,sum; ^ user.cpp:41:23: warning: variable ‘nrd’ set but not used [-Wunused-but-set-variable] int q,nra,nrb,nrc,nrd,sum; ^