Compilare: user.cpp: In function ‘long long int verif(long long int)’: user.cpp:5:27: warning: unused variable ‘c’ [-Wunused-variable] long long i,a=n1,b=n2,c,x,y; ^ user.cpp:5:29: warning: unused variable ‘x’ [-Wunused-variable] long long i,a=n1,b=n2,c,x,y; ^ user.cpp:5:31: warning: unused variable ‘y’ [-Wunused-variable] long long i,a=n1,b=n2,c,x,y; ^ user.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type] } ^