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I call it my billion-dollar mistake. It was the invention of the null reference in 1965.

Tony Hoare

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Tony Hoare
Age: 90
Born: 1934
Born: January 11
Computer Scientist
Engineer
Programmer
University Teacher
Writer
C. A. R. Hoare
Charles Antony Richard Hoare
Sir Charles Antony Richard Hoare
C.A.R. Hoare
Dollars
Mistake
Call
Null
Reference
Dollar
Billion
Billions
Invention

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I was eventually persuaded of the need to design programming notations so as to maximize the number of errors which cannot be made, or if made, can be reliably detected at compile time.
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The real value of tests is not that they detect bugs in the code but that they detect inadequacies in the methods, concentration, and skills of those who design and produce the code.
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There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies, and the other way is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult.
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The price of reliability is the pursuit of the utmost simplicity. It is a price which the very rich may find hard to pay.
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You cannot teach beginners top-down programming, because they don't know which end is up.
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Here is a language so far ahead of its time, that it was not only an improvement on its predecessors, but also on nearly all its successors.
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The job of formal methods is to elucidate the assumptions upon which formal correctness depends.
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Some problems are better evaded than solved.
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