Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
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Chapter 2, Problem 1PP

Easter Sunday is the first Sunday after the first full moon of spring. To compute the date, you can use this algorithm, invented by the mathematician Carl Friedrich Gauss in 1800:

  1. 1. Let y be the year (such as 1800 or 2001).
  2. 2. Divide y by 19 and call the remainder a. Ignore the quotient.
  3. 3. Divide y by 100 to get a quotient b and a remainder c.
  4. 4. Divide b by 4 to get a quotient d and a remainder e.
  5. 5. Divide 8 * b + 13 by 25 to get a quotient g. Ignore the remainder.
  6. 6. Divide 19 * a + b - d - g + 15 by 30 to get a remainder h. Ignore the quotient.
  7. 7. Divide c by 4 to get a quotient j and a remainder k.
  8. 8. Divide a + 11 * h by 319 to get a quotient m. Ignore the remainder.
  9. 9. Divide 2 * e + 2 * j - k - h + m + 32 by 7 to get a remainder r. Ignore the quotient.
  10. 10. Divide h - m + r + 90 by 25 to get a quotient n. Ignore the remainder.
  11. 11. Divide h - m + r + n + 19 by 32 to get a remainder p. Ignore the quotient.

Then Easter falls on day p of month n. For example, if y is 2001:

a = 6

b = 20, c = 1

d = 5, e = 0

g = 6

h = 18

j = 0, k = 1

m = 0

r = 6

n = 4

p = 15

Therefore, in 2001, Easter Sunday fell on April 15. Write a program that prompts the user for a year and prints out the month and day of Easter Sunday.

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Chapter 2 Solutions

Big Java Late Objects

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