Compilare: user.cpp: In function ‘int main()’: user.cpp:18:20: warning: unused variable ‘fa’ [-Wunused-variable] int n,i=1,fact,fa=0,c=1,a,ci; ^ user.cpp:18:29: warning: unused variable ‘a’ [-Wunused-variable] int n,i=1,fact,fa=0,c=1,a,ci; ^ user.cpp:33:12: warning: ‘fact’ may be used uninitialized in this function [-Wmaybe-uninitialized] n-=fact; ^