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De - Pt| Proverbs, aphorisms, quotations (English) | by Linux fortune |
| ... an anecdote from IBM's Yorktown Heights Research Center. When a programmer used his new computer terminal, all was fine when he was sitting down, but he couldn't log in to the system when he was standing up. That behavior was 100 percent repeatable: he could always log in when sitting and never when standing. Most of us just sit back and marvel at such a story; how could that terminal know whether the poor guy was sitting or standing? Good debuggers, though, know that there has to be a reason. Electrical theories are the easiest to hypothesize: was there a loose with under the carpet, or problems with static electricity? But electrical problems are rarely consistently reproducible. An alert IBMer finally noticed that the problem was in the terminal's keyboard: the tops of two keys were switched. When the programmer was seated he was a touch typist and the problem went unnoticed, but when he stood he was led astray by hunting and pecking. -- "Programming Pearls" column, by Jon Bentley in CACM February 1985 | |
| Do not allow this language (Ada) in its present state to be used in applications where reliability is critical, i.e., nuclear power stations, cruise missiles, early warning systems, anti-ballistic missle defense systems. The next rocket to go astray as a result of a programming language error may not be an exploratory space rocket on a harmless trip to Venus: It may be a nuclear warhead exploding over one of our cities. An unreliable programming language generating unreliable programs constitutes a far greater risk to our environment and to our society than unsafe cars, toxic pesticides, or accidents at nuclear power stations. - C. A. R. Hoare | |
| Never be led astray onto the path of virtue. | |
| The five colors blind the eye. The five tones deafen the ear. The five flavors dull the taste. Racing and hunting madden the mind. Precious things lead one astray. Therefore the sage is guided by what he feels and not by what he sees. He lets go of that and chooses this. | |
