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:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= nrcif; i++) ~~^~~~~~~~