Frases de Edsger Dijkstra

Edsger Dijkstra foto
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Edsger Dijkstra

Data de nascimento: 11. Maio 1930
Data de falecimento: 6. Agosto 2002

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Edsger Wybe Dijkstra foi um cientista da computação holandês conhecido por suas contribuições nas áreas de desenvolvimento de algoritmos e programas, de linguagens de programação , sistemas operacionais e processamento distribuído.

A pronúncia aproximada em português para Edsger Dijkstra é étsrrar déikstra .

Entre suas contribuições para a ciência da computação está incluído o algoritmo para o problema do caminho mínimo , o sistema operacional THE e a construção de semáforos para coordenar múltiplos processadores e programas. Outro conceito desenvolvido pelo cientista foi a auto-estabilização na área de sistemas distribuídos, uma forma alternativa de garantir a confiança de um sistema.

O cientista também foi conhecido por seus ensaios sobre programação, tendo sido o primeiro a alegar que programação é tão inerentemente difícil e complexa que os programadores precisam realizar qualquer abstração possível para gerenciar a complexidade com sucesso.

Citações Edsger Dijkstra

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„As a result, the topic became – primarily in the USA – prematurely known as ‘computer science’ – which, actually, is like referring to surgery as ‘knife science’ – and it was firmly implanted in people’s minds that computing science is about machines and their peripheral equipment. Quod non“

— Edsger W. Dijkstra
Context: A confusion of even longer standing came from the fact that the unprepared included the electronic engineers that were supposed to design, build and maintain the machines. The job was actually beyond the electronic technology of the day, and, as a result, the question of how to get and keep the physical equipment more or less in working condition became in the early days the all-overriding concern. As a result, the topic became – primarily in the USA – prematurely known as ‘computer science’ – which, actually, is like referring to surgery as ‘knife science’ – and it was firmly implanted in people’s minds that computing science is about machines and their peripheral equipment. Quod non [Latin: "Which is not true"]. We now know that electronic technology has no more to contribute to computing than the physical equipment. We now know that programmable computer is no more and no less than an extremely handy device for realizing any conceivable mechanism without changing a single wire, and that the core challenge for computing science is hence a conceptual one, viz., what (abstract) mechanisms we can conceive without getting lost in the complexities of our own making. Dijkstra (1986) [http://www.cs.utexas.edu/users/EWD/transcriptions/EWD09xx/EWD924.html On a cultural gap] (EWD 924).

„A programmer? But was that a respectable profession? For after all, what was programming? Where was the sound body of knowledge that could support it as an intellectually respectable discipline? I remember quite vividly how I envied my hardware colleagues, who, when asked about their professional competence, could at least point out that they knew everything about vacuum tubes, amplifiers and the rest, whereas I felt that, when faced with that question, I would stand empty-handed.“

— Edsger W. Dijkstra
Context: After having programmed for some three years, I had a discussion with A. van Wijngaarden, who was then my boss at the Mathematical Center in Amsterdam, a discussion for which I shall remain grateful to him as long as I live. The point was that I was supposed to study theoretical physics at the University of Leiden simultaneously, and as I found the two activities harder and harder to combine, I had to make up my mind, either to stop programming and become a real, respectable theoretical physicist, or to carry my study of physics to a formal completion only, with a minimum of effort, and to become....., yes what? A programmer? But was that a respectable profession? For after all, what was programming? Where was the sound body of knowledge that could support it as an intellectually respectable discipline? I remember quite vividly how I envied my hardware colleagues, who, when asked about their professional competence, could at least point out that they knew everything about vacuum tubes, amplifiers and the rest, whereas I felt that, when faced with that question, I would stand empty-handed. Full of misgivings I knocked on van Wijngaarden’s office door, asking him whether I could “speak to him for a moment”; when I left his office a number of hours later, I was another person. For after having listened to my problems patiently, he agreed that up till that moment there was not much of a programming discipline, but then he went on to explain quietly that automatic computers were here to stay, that we were just at the beginning and could not I be one of the persons called to make programming a respectable discipline in the years to come? This was a turning point in my life and I completed my study of physics formally as quickly as I could. One moral of the above story is, of course, that we must be very careful when we give advice to younger people; sometimes they follow it! Dijkstra (1972) [http://www.cs.utexas.edu/users/EWD/transcriptions/EWD03xx/EWD340.html The Humble Programmer] (EWD340).

„Program testing can be used to show the presence of bugs, but never to show their absence!“

— Edsger W. Dijkstra
Dijkstra (1970) "[http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD249.PDF Notes On Structured Programming]" (EWD249), Section 3 ("On The Reliability of Mechanisms"), corollary at the end.

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„It is not the task of the University to offer what society asks for, but to give what society needs.“

— Edsger W. Dijkstra
Dijkstra (2000), [http://www.cs.utexas.edu/~EWD/ewd13xx/EWD1305.PDF "Answers to questions from students of Software Engineering"] (EWD 1305).

„Thank goodness we don't have only serious problems, but ridiculous ones as well.“

— Edsger W. Dijkstra
Dijkstra (1982) "A Letter to My Old Friend Jonathan" (EWD475) p. 101 in

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„A convincing demonstration of correctness being impossible as long as the mechanism is regarded as a black box, our only hope lies in not regarding the mechanism as a black box.“

— Edsger W. Dijkstra
Dijkstra (1970) "[http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD249.PDF Notes On Structured Programming]" (EWD249), Section 3 ("On The Reliability of Mechanisms"), p. 5.

„Simplicity is a great virtue but it requires hard work to achieve it and education to appreciate it. And to make matters worse: complexity sells better.“

— Edsger W. Dijkstra
Dijkstra (1984) [http://www.cs.utexas.edu/users/EWD/transcriptions/EWD08xx/EWD896.html On the nature of Computing Science] (EWD896).

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