Compilare: main.cpp:60:51: warning: friend declaration 'Num<MOD> operator^(const Num<MOD>&, const Num<MOD>&)' declares a non-template function [-Wnon-template-friend] friend Num operator ^ (const Num &a, const Num &b); ^ main.cpp:60:51: note: (if this is not what you intended, make sure the function template has already been declared and add <> after the function name here) main.cpp:61:51: warning: friend declaration 'Num<MOD> operator/(const Num<MOD>&, const Num<MOD>&)' declares a non-template function [-Wnon-template-friend] friend Num operator / (const Num &a, const Num &b); ^