foo.cc: In member function 'void PolyList::Add(PolyList)':
foo.cc:79:14: error: 'L' was not declared in this scope
   79 |   for(Poly*p=L.Head; p!=NULL;p=p->next)
      |              ^
foo.cc:82:29: warning: statement has no effect [-Wunused-value]
   82 |    newp->coef=p->coef;newp->index;
      |                       ~~~~~~^~~~~
foo.cc: In function 'int main()':
foo.cc:97:5: error: request for member 'Add' in 'L1', which is of non-class type 'PolyList()'
   97 |  L1.Add(L2);
      |     ^~~
foo.cc:98:5: error: request for member 'Output' in 'L1', which is of non-class type 'PolyList()'
   98 |  L1.Output();
      |     ^~~~~~

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