Alan Perlis quotes:

It goes against the grain of modern education to teach students to program. What fun is there to making plans, acquiring discipline, organizing thoughts, devoting attention to detail, and learning to be self critical.

Fools ignore complexity. Pragmatists suffer it. Some can avoid it. Geniuses remove it.

The best book on programming for the layman is 'Alice in Wonderland'; but that's because it's the best book on anything for the layman.

If your computer speaks English, it was probably made in Japan.

Computer Science is embarrassed by the computer.

We toast the Lisp programmer who pens his thoughts within nests of parentheses.

A year spent in artificial intelligence is enough to make one believe in God.

There are two ways to write error-free programs; only the third one works.

A programming language is low level when its programs require attention to the irrelevant.

The computing field is always in need of new cliches.

In English every word can be verbed. Would that it were so in our programming languages.

Is it possible that software is not like anything else, that it is meant to be discarded: that the whole point is to always see it as a soap bubble?

You can measure a programmer's perspective by noting his attitude on the continuing vitality of FORTRAN.

I think it is inevitable that people program poorly. Training will not substantially help matters. We have to learn to live with it.

Don't have good ideas if you aren't willing to be responsible for them.

Simplicity does not precede complexity, but follows it.

Some programming languages manage to absorb change, but withstand progress.

When someone says, "I want a programming language in which I need only say what I want done," give him a lollipop.

It is easier to change the specification to fit the program than vice versa.

In software systems it is often the early bird that makes the worm.

Adapting old programs to fit new machines usually means adapting new machines to behave like old ones.

In computing, turning the obvious into the useful is a living definition of the word "frustration".

LISP programmers know the value of everything and the cost of nothing.

Optimization hinders evolution.

Optimization hinders evolution. Everything should be built top-down, except the first time. Simplicity does not precede complexity, but follows it.

In computing, turning the obvious into the useful is a living definition of the word 'frustration'.

One man's constant is another man's variable.

If a listener nods his head when you're explaining your program, wake him up.

A good programming language is a conceptual universe for thinking about programming.

In the long run, every program becomes rococo, and then rubble.

A picture is worth 10K words - but only those to describe the picture. Hardly any sets of 10K words can be adequately described with pictures.

If you have a procedure with 10 parameters, you probably missed some.

It is easier to write an incorrect program than understand a correct one.

It is better to have 100 functions operate on one data structure than to have 10 functions operate on 10 data structures.

To understand a program, you must become both the machine and the program.

A language that doesn't affect the way you think about programming is not worth knowing.

Every program has (at least) two purposes: the one for which it was written and another for which it wasn't.

Programmers are not to be measured by their ingenuity and their logic but by the completeness of their case analysis.

Motto for a research laboratory: what we work on today, others will first think of tomorrow.

When a professor insists computer science is X but not Y, have compassion for his graduate students.

Dealing with failure is easy: Work hard to improve. Success is also easy to handle: You've solved the wrong problem. Work hard to improve.

In English every word can be verbed.

You think you KNOW when you learn, are more sure when you can write, even more when you can teach, but certain when you can program.

C programmers never die. They are just cast into void.

Any noun can be verbed.

One can only display complex information in the mind. Like seeing, movement or flow or alteration of view is more important than the static picture, no matter how lovely.

One can't proceed from the informal to the formal by formal means.

We are on the verge: Today our program proved Fermat's next-to-last theorem.

In programming, as in everything else, to be in error is to be reborn.

Syntactic sugar causes cancer of the semicolon.

I think that it's extraordinarily important that we in computer science keep fun in computing. When it started out, it was an awful lot of fun. Of course, the paying customers got shafted every now and then, and after a while we began to take their complaints seriously. We began to feel as if we really were responsible for the successful, error-free perfect use of these machines. I don't think we are. I think we're responsible for stretching them, setting them off in new directions, and keeping fun in the house. I hope the field of computer science never loses its sense of fun.

Once you understand how to write a program get someone else to write it.

In man-machine symbiosis, it is man who must adjust: The machines can't.

There is no such thing as a free variable.

In computing, the mean time to failure keeps getting shorter.

Learning French is trivial: the word for horse is cheval, and everything else follows in the same way.

Often it is the means that justify the ends: goals advance technique and technique survives even when goal structures crumble.

FORTRAN is not a flower but a weed - it is hardy, occasionally blooms, and grows in every computer.