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Speaking at a software conference in 2009, Tony Hoare hyperbolically apologized for inventing the null reference: [25] [26] I call it my billion-dollar mistake. It was the invention of the null reference in 1965. At that time, I was designing the first comprehensive type system for references in an object oriented language . My goal was to ...
In 2009, Tony Hoare stated [17] [18] that he invented the null reference in 1965 as part of the ALGOL W language. In that 2009 reference Hoare describes his invention as a "billion-dollar mistake": I call it my billion-dollar mistake. It was the invention of the null reference in 1965.
Hoare logic (also known as Floyd–Hoare logic or Hoare rules) is a formal system with a set of logical rules for reasoning rigorously about the correctness of computer programs. It was proposed in 1969 by the British computer scientist and logician Tony Hoare , and subsequently refined by Hoare and other researchers. [ 1 ]
In a 2009 talk, Tony Hoare traced the invention of the null pointer to his design of the ALGOL W language and called it a "mistake": I call it my billion-dollar mistake. It was the invention of the null reference in 1965. At that time, I was designing the first comprehensive type system for references in an object oriented language (ALGOL W).
Invention of the Micral N, the earliest commercial, non-kit personal computer based on a microprocessor. 1967 Thompson, Ken: Created the Unix operating system, the B programming language, Plan 9 operating system, the first machine to achieve a Master rating in chess, and the UTF-8 encoding at Bell Labs and the Go programming language at Google ...
Quicksort is an efficient, general-purpose sorting algorithm.Quicksort was developed by British computer scientist Tony Hoare in 1959 [1] and published in 1961. [2] It is still a commonly used algorithm for sorting.
Finally, it increases type safety and can prevent problems due to null pointers [how?], labeled by C.A.R. Hoare—the null reference inventor—as "the billion dollar mistake" [2] From a Programming Languages perspective, it's reasonable to say that flow-sensitive typing is the feature that finally made it possible to build usable type-safe ...
Tony Hoare, first axiomatic basis for proving programs correct, CSP, the 1980 Turing Award for fundamental contributions to the definition and design of programming languages; Ric Holt, the Turing programming language, contributions to Grok, Euclid, SP/k, and S/SL