/in/foo.cc: In member function 'void linklist::init(int)':
/in/foo.cc:14:9: warning: unused variable 'y' [-Wunused-variable]
   node *y = new node;
         ^
/in/foo.cc: In member function 'int linklist::sum(int)':
/in/foo.cc:21:9: warning: unused variable 'y' [-Wunused-variable]
   node *y = new node;
         ^
/in/foo.cc: In member function 'void linklist::out(int, int)':
/in/foo.cc:28:9: warning: unused variable 'y' [-Wunused-variable]
   node *y = new node;
         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:40:11: warning: variable 'll' set but not used [-Wunused-but-set-variable]
  linklist ll=l;
           ^~