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type
Node = record
value: Int;
next: ^Node
end
var
first: ^Node
second: ^Node
third: ^Node
proc malloc(size: Word): Pointer
extern
proc free(ptr: Pointer)
extern
proc sum(node: ^Node): Int
var
result: Int
begin
result := 0;
if node = nil then
result := 0
else
result := node^.value + sum(node^.next)
end;
return result
begin
first := malloc(#size(Node));
second := malloc(#size(Node));
third := malloc(#size(Node));
first^.value := 1;
first^.next := second;
second^.value := 2;
second^.next := third;
third^.value := 3;
third^.next := nil;
assert(sum(first) = 6);
assert(first^.next^.next^.value = 3);
free(first);
free(second);
free(third)
end.
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