Az iterátorok használatát is bemutató Hello World program.
[stream] (CLU forrás)
start_up = proc()
outstream:stream := primary_output()
for s:string in get_hello_world() do
stream$putl(outstream,s)
end
end
get_hello_world = iter() yields(string)
while (true) do
yield ("Hello, World!")
end
end