I'm looking at homework 1, optional exercise 1 (Zeller's algorithm). The instructions have a contradiction when the month is Jan or Feb. At one point it says to subtract 1 from C, then it says to use the preceding year. They are not the same--it makes a difference when the year ends in 0, as in the year 2000. If you use the preceding year, year = 2000-1 = 1999; C = 99. But if you subtract 1 from C, year = 2000; C = 0-1 = -1. Any idea which is meant?

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