Lab 1: Easter Sunday

Background

• Due Date: Thursday, September 12, 2019
• Total Points: 10
• In this lab, you must write a Java program that determines which particular day and month that Easter Sunday appears.

Code Distribution

Description	File Size	File Name
Java Source Code for Easter Sunday	4.8KB	lab01.zip

Contents of lab01.zip:

Lab01EasterSunday/
├── EasterSunday.class
├── EasterSunday.ctxt
├── EasterSunday.java
├── EasterSundayJUnitTest.class
├── EasterSundayJUnitTest.ctxt
├── EasterSundayJUnitTest.java
├── package.bluej
└── README.TXT

Specification

• Write a Java program in the file EasterSunday.java that computes the date of Easter Sunday, given a particular year. Easter Sunday is a holiday which falls on the first Sunday after the first full moon of Spring. This algorithm was discovered by Carl Friedrich Gauss.
• The parameter year is the variable for the year in question. In the provided code, year takes on the value 2001.
• Your program must perform the following calculations:
  1. Divide year by 19 and call the remainder a. Ignore the quotient.
  2. Divide year by 100 to get a quotient b and a remainder c.
  3. Divide b by 4 to get a quotient d and a remainder e.
  4. Divide (8 * b + 13) by 25 to get a quotient g. Ignore the remainder.
  5. Divide (19 * a + b - d - g + 15) by 30 to get a remainder h. Ignore the quotient.
  6. Divide c by 4 to get a quotient j and a remainder k.
  7. Divide (a + 11 * h) by 319 to get a quotient m. Ignore the remainder.
  8. Divide (2 * e + 2 * j - k - h + m + 32) by 7 to get a remainder r. Ignore the quotient.
  9. Divide (h - m + r + 90) by 25 to get a quotient n. Ignore the remainder.
  10. Divide (h - m + r + n + 19) by 32 to get a remainder p. Ignore the quotient.
  11. The result is that Easter Sunday falls on day: p of the month: n.
• For example, given the year 2001, we find that the result is: n = 4 and p = 15. This means that Easter Sunday was on April 15 in the year 2001.
• You will write your solution in a function called retrieveDate(int year), right below the place where it says: YOUR CODE HERE.

Testing

• Click on the Run Tests button to execute the JUnit test bench. JUnit indicates a successful test with a green bar, and an unsuccessful test with a red bar.

Submission

• Upload the file EasterSunday.java to the Web-CAT automated grading platform.