Compilare: main.cpp: In function 'long long unsigned int fact(long long unsigned int)': main.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i <= x; i++) ~~^~~~ main.cpp: In function 'int main()': main.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= nrcif; i++) ~~^~~~~~~~ main.cpp:27:27: warning: variable 'x' set but not used [-Wunused-but-set-variable] unsigned long long n, x, nrcif = 0, scif = 0, stot = 0; ^