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Exercises 8.14 Drill and Practice

3.

Write code that takes an exam mark and prints a string — the grade for that mark — according to this scheme:
Table 8.14.1.
Mark Grade
>= 90 A
[80-90] B
[70-80] C
[60-70] D
< 60 F
The square and round brackets denote closed and open intervals. A closed interval includes the number, and open interval excludes it. So 79.99999 gets grade C , but 80 gets grade B.
Test your code by printing the mark and the grade for a number of different marks.

4.

Write code that takes an integer and prints True if the integer is an even number and False if it is odd.

5.

Implement the calculator for the date of Easter.
The following algorithm computes the date for Easter Sunday for any year between 1900 to 2099.
Ask the user to enter a year. Compute the following:
  1. a = year % 19
  2. b = year % 4
  3. c = year % 7
  4. d = (19 * a + 24) % 30
  5. e = (2 * b + 4 * c + 6 * d + 5) % 7
  6. dateofeaster = 22 + d + e
Special note: The algorithm can give a date in April. Also, if the year is one of four special years (1954, 1981, 2049, or 2076) then subtract 7 from the date.
Your program should print an error message if the user provides a date that is out of range.
Solution. 
year = int(input("Please enter a year"))
if year >= 1900 and year <= 2099:
    a = year % 19
    b = year % 4
    c = year % 7
    d = (19*a + 24) % 30
    e = (2*b + 4*c + 6*d + 5) % 7
    dateofeaster = 22 + d + e

    if year == 1954 or year == 2981 or year == 2049 or year == 2076:
        dateofeaster = dateofeaster - 7

    if dateofeaster > 31:
        print("April", dateofeaster - 31)
    else:
        print("March", dateofeaster)
else:
    print("ERROR...year out of range")
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