Compilare: user.cpp: In function ‘void prod(int*, int&, int*, int)’: user.cpp:8:10: warning: unused variable ‘c’ [-Wunused-variable] int i,j,c,r,a[10000],poz,k,nra=nr+n,na=n; ^ user.cpp:8:38: warning: unused variable ‘na’ [-Wunused-variable] int i,j,c,r,a[10000],poz,k,nra=nr+n,na=n; ^ user.cpp: In function ‘int main()’: user.cpp:44:10: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,t,v[100000],v2[10000],nv,nv2; ^