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with Ada.Text_IO; use Ada.Text_IO;
procedure List is
type MyList;
type MyList_Access is access MyList;
type MyList is record
Value : Integer := 0;
Next : MyList_Access := null;
end record;
function Length (XS : access constant MyList) return Integer is
L : Integer := 0;
Node : access constant MyList := XS;
begin
while Node /= null loop
L := L + 1;
Node := Node.Next;
end loop;
return L;
end Length;
procedure Print_List (XS : access constant MyList) is
begin
if XS /= null then
Put (Integer'Image (XS.Value) & " ");
Print_List (XS.Next);
end if;
end Print_List;
function Build_List return MyList_Access is
XS : MyList_Access := new MyList'(1, new MyList'(2, new MyList'(3, null)));
begin
return XS;
end Build_List;
XS : MyList_Access := Build_List;
begin
Put ("List: ");
Print_List (XS);
New_Line;
Put_Line ("The list has length " & Integer'Image (Length (XS)));
end List;
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