RosettaCodeData/Task/Doubly-linked-list-Element-insertion/Pascal/doubly-linked-list-element-insertion-1.pascal

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2013-04-10 22:43:41 -07:00
procedure insert_link( a, b, c: link_ptr );
begin
a^.next := c;
if b <> nil then b^.prev := c;
c^.next := b;
c^.prev := a;
end;