Modify the code so that the program prompts the user three questions and output
ID: 3664936 • Letter: M
Question
Modify the code so that the program prompts the user three questions and output six lines of messages as described below:
Your program asks for today’s date and two users’ birthdays and prints information about them. For both birthdays, the program prints the absolute day of the year on which that birthday falls, the number of days until the user’s next birthday. Next the program shows which user’s birthday comes sooner in the future. If it is a user’s birthday today or if the two birthdays are the same, different messages are printed.
Four sample dialogues are shown below, where user input is underlined and expected output is bold. The input date format: Month Day (with a single space in between).
Please enter today’s date (month day): 1 29
Today is 1/29/2016, day #29 of the year.
Please enter person #1’s birthday (month day): 10 17
10/17/2016 falls on day #291 of 366.
Your next birthday is in 262 day(s).
Please enter person #2’s birthday (month day): 11 23
11/23/2016 falls on day #328 of 366.
Your next birthday is in 299 day(s).
Person #1’s birthday is sooner.
Did ye know? 9/19 be International Talk like a Pirate day.
Arr, me mateys, arr!
===============================================================
Please enter today’s date (month day): 2 14
Today is 2/14/2016, day #45 of the year.
Please enter person #1’s birthday (month day): 1 10
1/10/2016 falls on day #10 of 366.
Your next birthday is in 331 day(s).
Please enter person #2’s birthday (month day): 2 28
2/28/2016 falls on day #59 of 366.
Your next birthday is in 14 day(s).
Person #2’s birthday is sooner.
Did ye know? 9/19 be International Talk like a Pirate day.
Arr, me mateys, arr!
===============================================================
Please enter today’s date (month day): 1 1
Today is 1/1/2016, day #1 of the year.
Please enter person #1’s birthday (month day): 1 1
1/1/2016 falls on day #1 of 366.
Happy Birthday! :)
Please enter person #2’s birthday (month day): 12 31
12/31/2016 falls on day #366 of 366.
Your next birthday is in 365 day(s).
Person #1’s birthday is sooner.
Did ye know? 9/19 be International Talk like a Pirate day.
Arr, me mateys, arr!
===============================================================
Please enter today’s date (month day): 2 28
Today is 2/28/2016, day #59 of the year.
Please enter person #1’s birthday (month day): 2 29
2/29/2016 falls on day #60 of 366.
Your next birthday is in 1 day(s).
Please enter person #2’s birthday (month day): 2 29
2/29/2016 falls on day #60 of 366.
Your next birthday is in 1 day(s).
Wow, you share the same birthday! ^_^
Did ye know? 9/19 be International Talk like a Pirate day.
Arr, me mateys, arr!
Note that the prompt messages and outputs need to be in the exact format as shown above. Lastly, the program prints a fun fact about your own birthday. Try searching Wikipedia, Bing, or Google for interesting facts about your date of birthday. For example, if yours is Sep. 19, you could print the following fact at the end:
Did ye know? 9/19 be International Talk like a Pirate day.
Arr, me mateys, arr!
Please note: this fun fact should appear for EVERY run, but NOT appear only for a specific date (i.e., your birth date).
c. Keep in mind, this program involves date comparisons in 2016, which is a “leap year.” Leap years have an extra 366th day, which occurs as February 29th.
d. Since this is an interactive program, it behaves differently when given different input. The examples above may not show all possible cases. Please examine all example outputs shown above and do your own testing.
e. For this assignment you are limited to the language features in Chapters 1-4 of the textbook. In particular, Do NOT use ANY library function to count the absolute day of the year, e.g. GregorianCalendar class or java.util.Calendar. (If you don’t know what it is, just ignore it ).
f. Development strategy: write your code in stages, continually making small improvements.
i. One major task in this program is computing the absolute day of the year on which each user’s birthday falls in 2016. Jan 1 is day #1. Jan 2 is #2. Jan 31 is #31. Feb 1 is #32. And so on, up to Dec 31, which is #366.
ii. You must compute absolute days of the year by writing a particular static method. This method should accept parameters representing a month and day and should return the absolute day of the year 2016 that is represented by those parameters. For example, calling this method with the parameter values of 2 and 13 (representing February 13th, 2016) should return 44, and calling it with parameter values of 9 and 19 (representing September 19th, 2016) should return 263. This method should not produce any console output, though the result it returns can be printed by code elsewhere in your program.
iii. Your method must compute its value using a cumulative sum as described in Chapter 4 of the textbook. To perform this calculation, you will also need code to evaluate the number of days in each particular month. You might put this code into a method that accepts a month parameter and returns the number of days in that month.
iv. Another major task is computing how many days remain until each user’s next birthday. There are several cases to consider. If the user’s birthday falls after today’s date, it is within the year 2016. However, if it falls before today’s date, the next birthday occurs in the year 2017, so you’ll need to think of a way to count the days that “wrap around” between today and the end of 2016, and then the start of 2017 to the user’s birthday in 2017.
g. Remember, your program will be graded both on “external correctness” (whether your program compiles and produces exactly the expected outputs), and “internal design and style” (whether your source code follows the style guide).
h. Submit the final “Birthdays.java” file (DO NOT change the file name) online.
Note 1: In the instructional examples above, in order to distinguish between user input and expected output, user input is underlined and expected output is bold. You DO NOT need to display this format.
Note 2: To parse the input dates (Month Day with a single space in between), the easiest way is to treat them as two separate integers. See Chapter 3 Lecture Notes slide #53 for example.
Explanation / Answer
/**The java program Birthdays that prompts month and day of the year
* and person1 month and day of the year and person2
* month and day of the year and prints the next birhtdays
* of the person1 and person2.
* */
//Birthdays.java
import java.util.Scanner;
public class Birthdays
{
//Set current year =2016
private static int YEAR=2016;
public static void main(String[] args)
{
//Create an instance of Scanner class object
Scanner scanner=new Scanner(System.in);
int month;
int day;
//declare p1month and p1day
int p1month;
int p1day;
//declare p2month and p2day
int p2month;
int p2day;
System.out.println("Please enter today’s date (month day):");
//read month and day
month=scanner.nextInt();
day=scanner.nextInt();
System.out.println("Today is "+month+"/"+day+"/"+YEAR+", day #"
+absoluteDays(month,day) +" of the year.");
System.out.println("Please enter person #1’s birthday (month day):");
//read p1month and p1day
p1month=scanner.nextInt();
p1day=scanner.nextInt();
int daysInYear=365;
//Call isLeapYear method
if(isLeapYear(YEAR))
daysInYear=366;
System.out.println(p1month+"/"+p1day+"/"+YEAR+
" falls on day #"+absoluteDays(p1month, p1day)+" of "+daysInYear+".");
//Call the p1 next birthday
int p1nextBirthday=absoluteDays(p1month, p1day)-absoluteDays(month, day);
if(p1nextBirthday<0)
p1nextBirthday=daysInYear-absoluteDays(month, day)+absoluteDays(p1month, p1day);
System.out.println("Your next birthday is in "+p1nextBirthday+" day(s).");
System.out.println("Please enter person #2’s birthday (month day):");
p2month=scanner.nextInt();
p2day=scanner.nextInt();
System.out.println(p2month+"/"+p2day+"/"+YEAR+
" falls on day #"+absoluteDays(p2month, p2day)+" of "+daysInYear+".");
//Call the p2 next birthday
int p2nextBirthday=absoluteDays(p2month, p2day)-absoluteDays(month, day);
System.out.println("Your next birthday is in "+p2nextBirthday+" day(s).");
if(p2nextBirthday<0)
p2nextBirthday=daysInYear-absoluteDays(month, day)+absoluteDays(p2month, p2day);
if(p1nextBirthday<p2nextBirthday)
System.out.println("Person #1’s birthday is sooner.");
else
System.out.println("Person #2’s birthday is sooner.");
//Check if the person1 month, day and person2 month and day
if((p1month==p2month) &&(p1day==p2day))
System.out.println("Wow, you share the same birthday! ^_^");
else
{
System.out.println("Did ye know? 9/19 be International Talk like a Pirate day.");
System.out.println("Arr, me mateys, arr!");
}
}//end of the main method
/*The method absoluteDays that takes month and day as input arguments
* and returns the number of days upto the given month and day*/
private static int absoluteDays(int month, int day)
{
int totalDays=0;
for (int i = 1; i < month; i++)
{
totalDays+=getDays(i);
}
return totalDays+day;
}
/* The method getDays that takes month as input argument that
* returns days in the month. */
public static int getDays(int month)
{
int days=0;
switch(month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
days=31;
break;
case 2:
if(isLeapYear(YEAR))
days=29;
else
days=28;
break;
case 4:
case 6:
case 9:
case 11:
days=30;
break;
}
return days;
}
/* The method isLeapYear that takes an integer value as an argument
* and return true if the year otherwise returns false.*/
private static boolean isLeapYear(int year)
{
return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
}
}//end of the class
-----------------------------------------------------------------------------------------------------
Sample Output:
sample output1:
Please enter today’s date (month day):
1 29
Today is 1/29/2016, day #29 of the year.
Please enter person #1’s birthday (month day):
10 17
10/17/2016 falls on day #291 of 366.
Your next birthday is in 262 day(s).
Please enter person #2’s birthday (month day):
11 23
11/23/2016 falls on day #328 of 366.
Your next birthday is in 299 day(s).
Person #1’s birthday is sooner.
Did ye know? 9/19 be International Talk like a Pirate day.
Arr, me mateys, arr!
sample output2:
Please enter today’s date (month day):
2 14
Today is 2/14/2016, day #45 of the year.
Please enter person #1’s birthday (month day):
1 10
1/10/2016 falls on day #10 of 366.
Your next birthday is in 331 day(s).
Please enter person #2’s birthday (month day):
2 28
2/28/2016 falls on day #59 of 366.
Your next birthday is in 14 day(s).
Person #2’s birthday is sooner.
Did ye know? 9/19 be International Talk like a Pirate day.
Arr, me mateys, arr!
sample output3:
Please enter today’s date (month day):
1 1
Today is 1/1/2016, day #1 of the year.
Please enter person #1’s birthday (month day):
1 1
1/1/2016 falls on day #1 of 366.
Your next birthday is in 0 day(s).
Please enter person #2’s birthday (month day):
12 31
12/31/2016 falls on day #366 of 366.
Your next birthday is in 365 day(s).
Person #1’s birthday is sooner.
Did ye know? 9/19 be International Talk like a Pirate day.
Arr, me mateys, arr!
sample output4:
Please enter today’s date (month day):
2 28
Today is 2/28/2016, day #59 of the year.
Please enter person #1’s birthday (month day):
2 29
2/29/2016 falls on day #60 of 366.
Your next birthday is in 1 day(s).
Please enter person #2’s birthday (month day):
2 29
2/29/2016 falls on day #60 of 366.
Your next birthday is in 1 day(s).
Person #2’s birthday is sooner.
Wow, you share the same birthday! ^_^
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