Talk:Per Brinch Hansen
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I'm not entirely sure about attributing the THE OS to him rather than Dijkstra; perhaps they were both involved.
I wasn't sure enough to include his authorship of a Communications of the ACM article in the late 1970s declaring the inadequacy of both test-at-head and test-at-end loops, and advocating syntaxes for expressing all loops as "n-and-a-half-times" loops, with the test just before a block of code that is executed just before "looping back" and skipped "the last time thru".
--Jerzy(t) 20:04, 2004 Jul 28 (UTC)