foo.cc: In member function 'void LinkList::Append(int)':
foo.cc:80:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   80 |   for(;tail->next!=NULL; tail=tail->next);
      |   ^~~
foo.cc:81:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   81 |    tail->next = newp;
      |    ^~~~
foo.cc: In member function 'void LinkList::f(LinkList&, LinkList&)':
foo.cc:117:21: warning: unused variable 'p2' [-Wunused-variable]
  117 |   Node *p1=L1.head,*p2=L2.head;
      |                     ^~
foo.cc: In member function 'bool LinkList::Search(int)':
foo.cc:130:2: warning: control reaches end of non-void function [-Wreturn-type]
  130 |  }
      |  ^

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