This view of software quality being positioned on a linear continuum is supplemented by the analysis of critical programming errors that under specific circumstances can lead to catastrophic outages or performance degradations that make a given system. Perlis yale university september 1980 the phenomena surrounding computers are diverse and yield a surprisingly rich base for launching metaphors at individual and group activities. The first epigrams were verses used by the greeks for the inscriptions on statues or other monuments to the dead. For had he said the doors alone from source i will deliver, alas, alas. Epigram on a software laird bless linus torvalds, o engineer, with grateful, lifted eyes, who taught that not the windows alone, but doors too shall open. It is easier to write an incorrect program than understand a correct one. For example, consider the idea of happiness and just how difficult it is to find or keep it. In the renaissance, george puttenham remarked that the epigram is a short and sweete form in which every mery conceited man might without any long studie or tedious ambage, make his friend sport, and anger his foe, and give a prettie nip, or shew a sharpe conceit i. In programming, everything we do is a special case of something more general and often we know it too quickly. Epigram exploits the propositions as types principle, and is based on intuitionistic type theory. This chapter goes beyond the typical material in a shell scripting class and presents material related to either downloading and compiling existing software including ports to new hardware andor operating systems or for preparing your own software for release via the internet. Epigram is a dependently typed programming language and an interactive programming environment.
This to me makes sense because very often in a program, one may declare something as a constant and then may want to change it. The cheapest, fastest, and most reliable components are those that arent there. If youre unsure what an epigram is, you dont have to feel bad about it. Chapter 5simplicity best practices in seeking the unattainable, simplicity only gets in the way. The cav community has actively pursued technologies such as presburger arithmetic, convex polyhedra linear arithmetic, bit vectors, sat solvers and quantifier elimination to handle numerical abstractions. Portray that idea in a brief and thoughtful saying. Sometimes i think the on ly universal in the computing field is the fetchexecutecycle. His publications includes greek epigram in the roman empire. Uninspired translations of the lively roman poet martials verses. The examples of epigrams below are among the best of all time, in one persons opinion. They force you to take this approach when designing software. His aim, he explained, was to capturein metaphorssomething of the relationship between classical human endeavours and software development work. Every line of code is written without reason, maintained out of weakness, and deleted by chance jeanpaul sartres programming in ansi c. A very short, satirical and witty poem usually written as a brief couplet or quatrain.
Software development quotations by steve c mcconnell. Epigrams are macros, since they are executed at read time. The epigrams are a series of short, programminglanguageneutral, humorous statements about computers and programming, which are widely quoted. The goal of computation is the emulation of our synthetic abilities. In seeking the unattainable, simplicity only gets in the way. Alan perliss own page listing the epigrams, in html for ease of readability.
A language that doesnt affect the way you think about programming, is not worth knowing. Gideon nisbet has taught and researched the classical world and its reception at the universities of glasgow, reading, warwick, and oxford, and is an expert in ancient epigram. Twitter didnt exist in 1982, though if it did, alan perlis would be a master tweeter. If there are epigrams, there must be meta epigrams. Write code that is easy to delete, not easy to extend. Epigram is a program for producing diagrams for inclusion in articles and reports. One of my favorite quotes not from the epigrams is about staying engaged in the actual business of learning, practicing, and most importantlyenjoying computer programming. Numerical abstractions are key to software verification. See also the original formatted version in pdf at the acm digital library if you have a subscription. Did not include one that should be a favourite ohe.
All my books, sire, to which you have given renown, that is, life, are dedicated to you. Famous epigrams these are some of the most famous epigrams of all time. Sometimes i think the only universal in the computing field is the fetchexecutecycle. Epigrams can be poetic, witty, paradoxical, and surprising.
Using the epigram as a literary device by freelance writing. Recursion is the root of computation since it trades description for time. Epigram definition is a concise poem dealing pointedly and often satirically with a single thought or event and often ending with an ingenious turn of thought. Epigram has got a type system which is strong enough to express the behaviour of programs, the type checker then guarantees that the program is well behaved. An epigram is a brief, interesting, memorable, and sometimes surprising or satirical statement. Adapting old programs to fit new machines usually means adapting new machines to behave like old ones. An epigram is a statement, or any brief saying in prose or poetry, in which there is an apparent contradiction. It is, however, a general purpose diagram creation tool. It first appeared in sigplan notices 179, september 1982. Dec 30, 2015 hes possibly most remembered today for his epigrams on programming, which are still brilliant and instructive more than three decades on.
Twitter didnt exist in 1982, though if it did, alan perlis would be. The most profitless thing to manufacture is excuses. Epigrams on programming perlis, 1982 see also the original formatted version in pdf at the acm digital library if you have a subscription. Programmers are not to be measured by their ingenuity and their logic but by the completeness of their case. Programming today is a race between software engineers striving to build bigger and better idiotproof programs, and the universe trying to produce bigger and better idiots. Epigrams of both praise and blame were a popular renaissance genre. Scratch is a new programming language that makes it easy to create your own interactive stories, animations, games, music, and art and share your creations on the web. If you have a procedure with 10 parameters, you probably missed some. Epigram is designed to be as simple as possible to use.
An epigram may be used as an epigraph, but epigraphs range in tone, form, and subject much more widely than epigrams do. Perlis yale university this text has been published in sigplan notices vol. If a program manipulates a large amount of date, it does so in a small number of ways. Whoa there, now thats enough, whoa there, little book. The examples are followed by a definition and brief history of the epigram form, after which more examples of the various genres and subgenres of epigrams are given.
That my readers also may know that i consider myself bound by this obligation, i have determined to make a declaration to that effect at the commencement of the book in a short epigram. Simplicity does not precede complexity, but follows it. For example, consider the idea of happiness and just how difficult it. Astronaut neil armstrong will be remembered forever as the first person to walk on the moon, and his message to the world as he set foot on the moons surface is equally as memorable. The following 105 epigramsor wise, pithy statementson life by b. Alan perlis, epigrams on programming structured programming supports the law of the excluded muddle. Alan perlis, epigrams on programming software and cathedrals are much the same first we build them, then we pray. My book, as you are about to enter the laurelwreathed palace of the lord of the world, learn to speak with modesty, and in a reverent tone. Top 25 software engineering quotes of 117 az quotes. Dec 08, 2012 alan j perlis, the first turing award winner for his work in the area of advanced programming techniques. Epigram is a functional programming language with dependent types. Every program is a part of some other program and rarely fits.
The goal is to support a smooth transition from ordinary programming to integrated programs and proofs whose correctness can be checked and certified by the compiler. This to me makes sense because very often in a program, one may declare something as a constant and. Epigrams are interfaces across which appreciation and insight flow. Epigram is a dependently typed programming language and an interactive. As soon as we started programming, we found to our surprise that it wasnt as easy to get programs right as we had thought. From acms sigplan publication, september, 1982, article epigrams in programming, by alan j. Epigrams type system is strong enough to express program specifications. The epigrams are a series of short, programminglanguage neutral, humorous statements about computers and programming, which are widely quoted. Epigrams on programming is an article by alan perlis published in 1982, for acms sigplan journal. For a taste of apls cryptic aesthetic, consider this program for finding occurrences of a. To avoid paying for a lot of code, we build reusable software. Epigrams retrieve deep semantics from a data base that is all procedure.
Apr 23, 2016 what second programming language to learn. Today our program proved fermats nexttolast theorem. An epigram program is really a tree of proof tactics which drive the underlying construction in utt. Alan perlis, epigrams on programming there are two ways to write errorfree programs. Perhaps if we wrote programs from childhood on, as adults wed be able to read them. Epigrams on programming perlis, 1982 see also the original. I hope you enjoy reading them as much as i enjoyed compiling them. Hes possibly most remembered today for his epigrams on programming, which are still brilliant and instructive more than three decades on. In software systems it is often the early bird that makes the worm. If two people write exactly the same program, each should be put in microcode and then they certainly wont. The man who has done his level best, and who is conscious that he has done his. Alan jay perlis epigrams on programming the concept of value, for enterprise assets, is essential because selection from managing complexity of information systems. Alan j perlis, the first turing award winner for his work in the area of advanced programming techniques. It is easier to change the specification to fit the program than vice versa.
The goal of computation is the emulation of our synthetic abilities, not the understanding of our analytic ones. The romans were the first to use epigrams as satirical devices, and william shakespeare made them popular as poetic closed couplets. You cant communicate complexity, only an awareness of it. The phenomena surrounding computers are diverse and yield a surprisingly rich base for launching metaphors at individual and group activities. Syntactic sugar are constructs added to a language, to make it easier for programmers to read and write program code. Scratch is designed to help young people ages 8 and up develop 21st century learning skills.
In order to write an epigram, think of an idea to convey. Its ok to figure out murder mysteries, but you shouldnt need to figure out code. Epigrams on programming epigrams on programming is an article by alan perlis published in 1982, for acms sigplan journal. Epigrams in programming one mans constant is another mans variable. If you just make a variable soup, it becomes very difficult to verify. Burch the top ten most famous epigrams of all time a cynic is a man who knows the price of everything and the value of nothing.
Jan 31, 20 this view of software quality being positioned on a linear continuum is supplemented by the analysis of critical programming errors that under specific circumstances can lead to catastrophic outages or performance degradations that make a given system unsuitable for use regardless of rating based on aggregated measurements. Jul 22, 2014 the following 105 epigrams or wise, pithy statements on life by b. Brevity is difficult, and so is wit, but the epigram effortless combines the two for a memorable and universal expression of truth. Martials forgotten rivals oup, 2003, greek epigram in reception oup, 20 and the greece and rome new survey, epigram cup, 2010. Alan perlis was the first winner of the turing award in 1966. In the spirit of that saying lets elaborate on how to choose a second programming language if you already know one. Epigram also refers to the ide usually packaged with the language. I can remember the exact instant when i realized that a large part of my life from then on was going to be spent in finding mistakes in my own programs. If a program manipulates a large amount of data, it does so in a small number of ways. The epigrams are a series of short, programming languageneutral, humorous statements about computers and programming, which are widely quoted. It is called epigram because it was written to create epidemiological contact tracing and social network diagrams for inclusion in outbreak and other epidemiological reports. Putting simplicity principles into practice in the previous selection from managing complexity of information systems. These epigrams are basically one line description of his experience that he learned over the year of his work. A programming language is low level when its programs require attention to the.445 1035 814 148 849 695 1343 1620 340 1244 55 521 779 1323 846 1550 15 1440 331 174 1255 745 1278 1230 798 832 416 582 770 581 1379 1310