Compilare: user.cpp: In member function ‘nrmare& nrmare::operator+(nrmare&)’: user.cpp:34:16: warning: reference to local variable ‘c’ returned [-Wreturn-local-addr] nrmare c; ^ user.cpp: In function ‘std::ostream& operator<<(std::ostream&, nrmare)’: user.cpp:60:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:67:13: warning: unused variable ‘tot’ [-Wunused-variable] int x,y,tot; ^