摘自 Expert C Programming - Deep C Secrets中的一段 Like the Potrzebie system, the joke about programmers' confusion over Halloween and Christmas Day depends on inside knowledge of numbering systems. The reason that programmers can't tell Halloween from Christmas Day is because 31 in octal (base eight) equals 25 in decimal (base ten). More succinctly, OCT 31 equals DEC 25! When I wrote to Professor Knuth asking his permission to tell the story, and including a draft copy of the chapter, he not only agreed, he marked numerous proofreading improvements on the text, and pointed out that programmers can't distinguish NOV 27 from the other two dates, either 來源: http://my.safaribooksonline.com/0131774298/ch08 OCT 31和 DEC 25的關係是很清楚 不過Knuth講的NOV 27就看不出端倪了, 上面兩個跟感恩節有啥關係 難道是念數學的人才看得懂的joke? --

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