Frases de Edsger Dijkstra (71 citações, página 2)

Edsger Dijkstra: 71 citações 0 Curtidas

Edsger Dijkstra Frases famosas

“Testes de programas podem ser uma maneira muito eficaz para demonstrar a presença de erros, mas é irremediavelmente insuficiente para mostrar a sua ausência.”

Edsger Dijkstra

Program testing can be a very effective way to show the presence of bugs, but is hopelessly inadequate for showing their absence.
The Humble Programmer, ACM Turing Lecture 1972

“A introdução de abstrações adequadas é a nossa única ajuda mental para reduzir o apelo à enumeração, para organizar e dominar a complexidade.”

Edsger Dijkstra

The introduction of suitable abstractions is our only mental aid to reduce the appeal to enumeration, to organize and master complexity.
Selected writings on computing: a personal perspective - página 2, Edsger Wybe Dijkstra - Springer-Verlag, 1982, ISBN 0387906525, 9780387906522 - 362 páginas

“Ciência da Computação está tão relacionada aos computadores quanto a Astronomia aos telescópios, Biologia aos microscópios, ou Química aos tubos de ensaio. A Ciência não estuda ferramentas. Ela estuda como nós as utilizamos, e o que descobrimos com elas.”

Edsger Dijkstra

Computer science is no more about computers than astronomy is about telescopes, biology is about microscopes or chemistry is about beakers and test tubes. Science is not about tools, it is about how we use them and what we find out when we do.
Fellows, M.R., and Parberry, I., "SIGACT trying to get children excited about CS", January 1993, Computing Research News.
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Edsger Dijkstra: Frases em inglês

“In the good old days physicists repeated each other's experiments, just to be sure. Today they stick to FORTRAN, so that they can share each other's programs, bugs included.”

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Edsger W. Dijkstra

1970s, How do we tell truths that might hurt? (1975)

“The use of COBOL cripples the mind; its teaching should, therefore, be regarded as a criminal offense.”

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Edsger W. Dijkstra

1970s, How do we tell truths that might hurt? (1975)

“As economics is known as "The Miserable Science", software engineering should be known as "The Doomed Discipline", doomed because it cannot even approach its goal since its goal is self-contradictory. (…) Software engineering has accepted as its charter "How to program if you cannot.”

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Edsger W. Dijkstra

Dijkstra (1988) " On the cruelty of really teaching computing science http://www.cs.utexas.edu/users/EWD/transcriptions/EWD10xx/EWD1036.html (EWD1036).
1980s

“About the use of language: it is impossible to sharpen a pencil with a blunt axe. It is equally vain to try to do it with ten blunt axes instead.”

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Edsger W. Dijkstra

1970s, How do we tell truths that might hurt? (1975)

“As a result of a long sequence of coincidences I entered the programming profession officially on the first spring morning of 1952, and as far as I have been able to trace, I was the first Dutchman to do so in my country.”

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Edsger W. Dijkstra

1970s, The Humble Programmer (1972)

“Programming is one of the most difficult branches of applied mathematics; the poorer mathematicians had better remain pure mathematicians.”

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Edsger W. Dijkstra

1970s, How do we tell truths that might hurt? (1975)

“What is the shortest way to travel from Rotterdam to Groningen, in general: from given city to given city. It is the algorithm for the shortest path, which I designed in about twenty minutes. One morning I was shopping in Amsterdam with my young fiancée, and tired, we sat down on the café terrace to drink a cup of coffee and I was just thinking about whether I could do this, and I then designed the algorithm for the shortest path. As I said, it was a twenty-minute invention. In fact, it was published in ’59, three years late. The publication is still readable, it is, in fact, quite nice. One of the reasons that it is so nice was that I designed it without pencil and paper. I learned later that one of the advantages of designing without pencil and paper is that you are almost forced to avoid all avoidable complexities. Eventually that algorithm became, to my great amazement, one of the cornerstones of my fame.”

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Edsger W. Dijkstra

Dijkstra (2001), in an interview with Philip L. Frana. (OH 330; Communications of the ACM 53(8):41–47)
2000s

“Our intellectual powers are rather geared to master static relations and … our powers to visualize processes evolving in time are relatively poorly developed. For that reason we should do (as wise programmers aware of our limitations) our utmost to shorten the conceptual gap between the static program and the dynamic process, to make the correspondence between the program (spread out in text space) and the process (spread out in time) as trivial as possible.”

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Edsger W. Dijkstra

Dijkstra (1968) " A Case against the GO TO Statement http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD215.PDF" cited in: Bill Curtis (1981) Tutorial, human factors in software development. p. 109.
1960s

“When I came back from Munich, it was September, and I was Professor of Mathematics at the Eindhoven University of Technology. Later I learned that I had been the Department's third choice, after two numerical analysts had turned the invitation down; the decision to invite me had not been an easy one, on the one hand because I had not really studied mathematics, and on the other hand because of my sandals, my beard and my "arrogance"”

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Edsger W. Dijkstra

whatever that may be
Dijkstra (1993) "From my Life" http://www.cs.utexas.edu/users/EWD/transcriptions/EWD11xx/EWD1166.html (EWD 1166).
1990s

“My point today is that, if we wish to count lines of code, we should not regard them as "lines produced" but as "lines spent": the current conventional wisdom is so foolish as to book that count on the wrong side of the ledger.”

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Edsger W. Dijkstra

Dijkstra (1988) " On the cruelty of really teaching computing science http://www.cs.utexas.edu/users/EWD/transcriptions/EWD10xx/EWD1036.html (EWD1036).
1980s

“In the wake of the Cultural Revolution and now of the recession I observe a mounting pressure to co-operate and to promote "teamwork". For its anti-individualistic streak, such a drive is of course highly suspect; some people may not be so sensitive to it, but having seen the Hitlerjugend in action suffices for the rest of your life to be very wary of "team spirit."”

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Edsger W. Dijkstra

Very.
Dijkstra (1994) "The strengths of the academic enterprise" http://www.cs.utexas.edu/users/EWD/transcriptions/EWD11xx/EWD1175.html (EWD 1175).
1990s

“The competent programmer is fully aware of the strictly limited size of his own skull; therefore he approaches the programming task in full humility, and among other things he avoids clever tricks like the plague.”

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Edsger W. Dijkstra

Dijkstra (1972) The Humble Programmer http://www.cs.utexas.edu/users/EWD/transcriptions/EWD03xx/EWD340.html (EWD340).
1970s

“In short, I suggest that the programmer should continue to understand what he is doing, that his growing product remains firmly within his intellectual grip. It is my sad experience that this suggestion is repulsive to the average experienced programmer, who clearly derives a major part of his professional excitement from not quite understanding what he is doing. In this streamlined age, one of our most undernourished psychological needs is the craving for Black Magic and apparently the automatic computer can satisfy this need for the professional software engineer, who is secretly enthralled by the gigantic risks he takes in his daring irresponsibility. For his frustrations I have no remedy……”

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Edsger W. Dijkstra

Unknown date

“Write a paper promising salvation, make it a 'structured' something or a 'virtual' something, or 'abstract', 'distributed' or 'higher-order' or 'applicative' and you can almost be certain of having started a new cult.”

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Edsger W. Dijkstra

Dijkstra (1979) My hopes of computing science http://www.cs.utexas.edu/users/EWD/transcriptions/EWD07xx/EWD709.html (EWD 709).
1970s

“FORTRAN's tragic fate has been its wide acceptance, mentally chaining thousands and thousands of programmers to our past mistakes.”

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Edsger W. Dijkstra

1970s, The Humble Programmer (1972)

“Several people have told me that my inability to suffer fools gladly is one of my main weaknesses.”

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Edsger W. Dijkstra

Dijkstra (1978) The pragmatic engineer versus the scientific designer http://www.cs.utexas.edu/users/EWD/transcriptions/EWD06xx/EWD690.html (EWD 690).
1970s

“LISP has been jokingly described as "the most intelligent way to misuse a computer". I think that description a great compliment because it transmits the full flavor of liberation: it has assisted a number of our most gifted fellow humans in thinking previously impossible thoughts.”

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Edsger W. Dijkstra

1970s, The Humble Programmer (1972)

“Don't blame me for the fact that competent programming, as I view it as an intellectual possibility, will be too difficult for "the average programmer" — you must not fall into the trap of rejecting a surgical technique because it is beyond the capabilities of the barber in his shop around the corner.”

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Edsger W. Dijkstra

Dijkstra (1975) Comments at a Symposium http://www.cs.utexas.edu/users/EWD/transcriptions/EWD05xx/EWD512.html (EWD 512).
1970s

“May, in spite of all distractions generated by technology, all of you succeed in turning information into knowledge, knowledge into understanding, and understanding into wisdom.”

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Edsger W. Dijkstra

Dijkstra (1998) https://www.cs.utexas.edu/users/vl/notes/dijkstra.html
1990s

“When FORTRAN has been called an infantile disorder, full PL/1, with its growth characteristics of a dangerous tumor, could turn out to be a fatal disease.”

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Edsger W. Dijkstra

1970s, The Humble Programmer (1972)

“We can found no scientific discipline, nor a hearty profession, on the technical mistakes of the Department of Defense and, mainly, one computer manufacturer.”

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Edsger W. Dijkstra

1970s, How do we tell truths that might hurt? (1975)

“The art of programming is the art of organizing complexity, of mastering multitude and avoiding its bastard chaos as effectively as possible.”

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Edsger W. Dijkstra

Dijkstra (1970) " Notes On Structured Programming http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD249.PDF" (EWD249), Section 3 ("On The Reliability of Mechanisms"), p. 7.
1970s

“The problems of the real world are primarily those you are left with when you refuse to apply their effective solutions.”

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Edsger W. Dijkstra

Dijkstra (1988) " On the cruelty of really teaching computing science http://www.cs.utexas.edu/users/EWD/transcriptions/EWD10xx/EWD1036.html (EWD1036).
1980s

“FORTRAN, 'the infantile disorder', by now nearly 20 years old, is hopelessly inadequate for whatever computer application you have in mind today: it is now too clumsy, too risky, and too expensive to use.”

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Edsger W. Dijkstra

1970s, How do we tell truths that might hurt? (1975)

“APL is a mistake, carried through to perfection. It is the language of the future for the programming techniques of the past: it creates a new generation of coding bums.”

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Edsger W. Dijkstra

1970s, How do we tell truths that might hurt? (1975)

“On Our Inability To Do Much.”

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Edsger W. Dijkstra

Dijkstra (1972) "Structured Programming", Chapter title in O.J. Dahl, E.W. Dijkstra, and C.A.R. Hoare. Academic Press, 1972 ISBN 0122005503.
1970s

“[Though computer science is a fairly new discipline, it is predominantly based on the Cartesian world view. As Edsgar W. Dijkstra has pointed out] A scientific discipline emerges with the - usually rather slow! - discovery of which aspects can be meaningfully 'studied in isolation for the sake of their own consistency.”

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Edsger W. Dijkstra

Dijkstra (1982) as cited in: Douglas Schuler, Douglas Schuler Jonathan Jacky (1989) Directions and Implications of Advanced Computing, 1987. Vol 1, p. 84.
1980s