/in/foo.cc: In function 'int main()':
/in/foo.cc:74:2: error: 'LinkList' was not declared in this scope
  LinkList La, Lb, Lc;
  ^~~~~~~~
/in/foo.cc:77:12: error: 'La' was not declared in this scope
  CreatList(La, m);
            ^~
/in/foo.cc:77:17: error: 'CreatList' was not declared in this scope
  CreatList(La, m);
                 ^
/in/foo.cc:79:12: error: 'Lb' was not declared in this scope
  CreatList(Lb, n);
            ^~
/in/foo.cc:80:12: error: 'Lc' was not declared in this scope
  CreatList(Lc, 0);
            ^~
/in/foo.cc:81:16: error: 'add' was not declared in this scope
  add(La, Lb, Lc);
                ^
/in/foo.cc:82:14: error: 'ListPrint' was not declared in this scope
  ListPrint(Lc);
              ^