HW #4
Due Date: November 20th
Homework 4 grading rubric:
1. Output examples
a. One Normal Year, 10%
b. One Leap Year, 10%
2. Style
a. Meaningful variable names, 10%
b. Meaningful method names, 10%
c. Comments, Total: 10%
i. Do not comment every line. 5%
ii. Comment non-obvious code. 5%
d. Indentation, 10%
e. Block comment with name and hour, 5%
3. Calendar,
a. Title includes Month and Year, 5%
b. Correct number of days in month from method, 10%
c. Correct first day of the month, 5%
d. Method takes firstDay and MonthLength, 10%
e. Padding, Total: 15%
i. Month name is centered 5%
ii. Spacing between day numbers changes , 10%
1. for example: “1 “ and “10” are padded to the same length.
f. Month starts at day 1, 5%
● These must be demonstrated by the student
○ Can handle complex logic
■ Can break logic into more simple subproblems
○ Use of while loops, and other ch5 tools.
○ Use of modulus
○ Use of methods
■ Return values captured and used.
○ Writing methods
○ Student has learned good style
Problem: Write a program that prints the calendar for a given
year.
Top down design: Break down the problem into sub problems
and state what you will achieve for each of the sub problems
First we need to break down into two sub problems.
1. Get the user’s input
a. Read the input(year)
2. Print the calendar for the year
a. Print the calendar for each month of the year
i. Print the title for each month in the year.
1. Print the month and the year
2. Print “Sunday Monday Tuesday
Wednesday Thursday Friday Saturday”.
ii. Print the body for the month
1. Need to know the number of the days
for each month of the year
2. Need to know if the year is a leap year or
not. A year is a leap year if it is divisible
by 400 or if the year is divisible by 4 but
not divisible by 100
3. Need to know the number for the first
day in the month. For example November
1st was on a Saturday which is the 6th day
of the week assuming that Sunday is the
zero day of the week. To figure out
which day is the first day of the month
you need to do the following:
a. Calculate the total number of days
since 1800 up to the month of the
year that you are trying to print the
calendari. Calculate the total number of
days since 1800 up to one year
prior to the given year. Note
that you also need to check if
the year is a leap year or not.
For example if the user enters
2014, we need to calculate how
many days from 1800 to 2013.
Need a for loop and in the for
loop you need to check if the
year is a leap year.
ii. Add the total days from the
beginning of the given year up
to the month. For example if
we are trying to print the
calendar for the March 2014,
then we need to add the total
number of days in Jan and Feb
to whatever we calculated in i.
iii. Whatever you get from ii add 3
to it(January 1800 was on a
Wednesday)
iv. Calculate the remainder of iii to
7, this result will tell you that
first days of month is Sun or
Mon or Tue, or Wed or Thu or
Fri or Sat.4. Determine the date for thanksgiving
5. Now that you know the number of the
days in the month and the day for the
first day of the month you can print the
calendar.
3. Now you can write a method that accepts the number
of the days in the month and the first day of the month ,
then print the body
a. 1. If the first day of the month is for example on a
Saturday which is the 6th day of the week then you
need to output 5 blanks “ “.
b. You start printing from number from 1 to the last
day of the month.

press m to print the calender for the month, press y to print
the calender for the year m/y
¼¼§Ïm
ÏϧÏ
ÏϧÏEnter a valid year before 1800
¼¼§Ï2014
ÏϧÏEnter the month :
¼¼§Ï7
ÏÏ§Ï July 2014
ÏϧÏ----------------------------
ÏϧÏSun Mon Tue Wed Thu Fri Sat
ÏÏ§Ï 1 2 3 4 5 ÏϧÏ6 7 8 9 10 11 12
ÏϧÏ13 14 15 16 17 18 19
ÏϧÏ20 21 22 23 24 25 26
ÏϧÏ27 28 29 30 31
ÏϧÏDo you have another year to print the calender:yes/no
¼¼§Ïyes
ÏϧÏpress m to print the calender for the month, press y to
print the calender for the year m/y
¼¼§Ïy
ÏϧÏ
ÏϧÏEnter a valid year before 1800
¼¼§Ï2013
ÏÏ§Ï January 2013
ÏϧÏ----------------------------
ÏϧÏSun Mon Tue Wed Thu Fri Sat
ÏÏ§Ï 1 2 3 4 5
ÏϧÏ6 7 8 9 10 11 12
ÏϧÏ13 14 15 16 17 18 19
ÏϧÏ20 21 22 23 24 25 26
ÏϧÏ27 28 29 30 31