Compilare: user.cpp: In function ‘int main()’: user.cpp:42:13: warning: unused variable ‘nr’ [-Wunused-variable] long p, nr=0, i,x; ^ user.cpp:42:19: warning: unused variable ‘i’ [-Wunused-variable] long p, nr=0, i,x; ^ user.cpp:42:21: warning: unused variable ‘x’ [-Wunused-variable] long p, nr=0, i,x; ^