Compilare: user.cpp: In function ‘int valid(long unsigned int)’: user.cpp:14: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void det(int)’: user.cpp:32: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:40: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp: In function ‘void detFact(long unsigned int)’: user.cpp:94: warning: comparison between signed and unsigned integer expressions