Tony Hoare: Invention of the null-reference a billion dollar mistake

Computing Pioneer Sir Charles Antony Richard Hoare (aka C.A.R. Hoare) was mostly known for his Quicksort algorithm, but less remembered for the idea of the “null-reference”. He noted in 2009 that it was his “billion-dollar mistake” which he regretted and only implemented it because it was so easy to do: I call it my billion-dollar […]

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