Compilare: user.cpp: In function ‘bool unuzero(long int)’: user.cpp:38:8: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (x % 10 == 0 || x % 10 == 1) ^ user.cpp: In function ‘int main()’: user.cpp:67:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; i++) ^ user.cpp:74:14: warning: unused variable ‘k’ [-Wunused-variable] long k; ^ user.cpp: In function ‘bool unuzero(long int)’: user.cpp:43:1: warning: control reaches end of non-void function [-Wreturn-type] } ^