Compilare: user.cpp: In member function ‘HugeN& HugeN::operator*(long long int)’: user.cpp:60:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=temp.x[0]; i++) ^ user.cpp:62:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=temp.x[0]; i++) ^ user.cpp:56:15: warning: reference to local variable ‘temp’ returned [-Wreturn-local-addr] HugeN temp; ^