Question

SUBMIT DayGrid.java Programming Projects 195 Sun Mon Tue Wed Thu Fri Sat I 67819 | 10 11 12 I 13 14 15 16 17 18 19 I | 20 21 22 23 24 25 26 I |27 28 29 30 31 I One tricky part of this program is making the various columns line up properly with proper widths. We will learn better ways of formatting output in the next chapter. For now, you may copy the following helper method into your program and call it to turn a number into a left-padded string of a given exact width. For example, the call Additional Iverson requirements for Bellevue College CS210, WINTER 2018: Crucial Note: I know, and you soon will know, that assigning something straight from this text will create a massive hunt for the solution posted someplace on the internet. Such work does not help anyone learn to program!!! Therefore: Listed below are specific Iverson modifications that make this assignment unique. Go ahead, find what examples you can on the internet. LEARN from those examples, then close that window, and write your own code!!! 1. DO NOT use the padded helper provided, chapter 4 has better tools, like printf if needed 2. MUST write a method showGrid(month, year) that produces output, see example below 3. int month is a parameter, must be 1-12 for the twelve months of the year 4. int year is a year of the Gregorian calendar (additional detail below) 5. MUST use a method days!nMonth. Exercise #4, page 309, Chapter 4 6. showGrid works for any month (1-12), and any year (1900-2100) including leap years 7. Program Submission Requirement 8. Write your own code!!! All submissions will be processed with JPlag: jplag.ipd.kit.edu e In text project, we're given the first Sunday, but the lverson requirements indicate that we do not provide this. How do we get the fhrst Sunday of a month???? My answer: use the Oracle GregorianCalendar:

Answer 1

Code:

import java.util.Scanner;

public class DayGrid {

/** Main method */

public static void main(String[] args) {
Scanner scan = new Scanner (System.in);

//Prompt the user to enter year
System.out.print("Enter full year (e.g., 2001): ");
int year = scan.nextInt();

// Prompt the user to enter month
System.out.print("Enter month in number between 1 and 12: ");
int month = scan.nextInt();

// Print calendar for the month of the year
if (month < 1 || month > 12 || year < 1980)
System.out.println("Wrong input!");
else
printMonth(year, month);

}
/** Print the calendar for a month in a year */

static void printMonth(int year, int month) {

//Print the headings of the calendar
printMonthTitle(year, month);

//Print the body of the calendar
printMonthBody(year, month);
}

/** Print the month title, e.g., May, 1999 */

static void printMonthTitle(int year, int month) {

System.out.println(" " + getMonthName(month) + " " + year);
System.out.println("–––––––––––––––––––––––––––––");
System.out.println(" Sun Mon Tue Wed Thu Fri Sat");

}

/** Get the English name for the month */
static String getMonthName(int month) {
String monthName = null;
switch (month) {
case 1: monthName = "January"; break;
case 2: monthName = "February"; break;
case 3: monthName = "March"; break;
case 4: monthName = "April"; break;
case 5: monthName = "May"; break;
case 6: monthName = "June"; break;
case 7: monthName = "July"; break;
case 8: monthName = "August"; break;
case 9: monthName = "September"; break;
case 10: monthName = "October"; break;
case 11: monthName = "November"; break;
case 12: monthName = "December";
}
return monthName;
}

/** Print month body */
static void printMonthBody(int year, int month) {

// Get start day of the week for the first date in the month
int startDay = getStartDay(year, month);

// Get number of days in the month
int numberOfDaysInMonth = getNumberOfDaysInMonth(year, month);

// Pad space before the first day of the month
int i = 0;
for (i = 0; i < startDay; i++)
System.out.print(" ");
for (i = 1; i <= numberOfDaysInMonth; i++) {
if (i < 10)
System.out.print(" " + i);
else
System.out.print(" " + i);
if ((i + startDay) % 7 == 0)
System.out.println();
}
System.out.println();
}

/** Get the start day of the first day in a month */

static int getStartDay(int year, int month) {

//Get total number of days since 1/1/1800
int startDay1800 = 3;
int totalNumberOfDays = getTotalNumberOfDays(year, month);

//Return the start day
return (totalNumberOfDays + startDay1800) % 7;
}

/** Get the total number of days since January 1, 1800 */

static int getTotalNumberOfDays(int year, int month) {
int total = 0;

//Get the total days from 1800 to year - 1
for (int i = 1800; i < year; i++)
if (isLeapYear(i))
total = total + 366;
else
total = total + 365;

//Add days from January to the month prior to the calendar month
for (int i = 1; i < month; i++)
total = total + getNumberOfDaysInMonth(year, i);

return total;
}

/** Get the number of days in a month */

static int getNumberOfDaysInMonth(int year, int month) {
if (month == 1 || month == 3 || month == 5 || month == 7 ||
month == 8 || month == 10 || month == 12)
return 31;

if (month == 4 || month == 6 || month == 9 || month == 11)
return 30;

if (month == 2) return isLeapYear(year) ? 29 : 28;

return 0; // If month is incorrect
}

/** Determine if it is a leap year */
static boolean isLeapYear(int year) {
return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
}
}

Output:

Enter full year (e.g., 2001): 2018 Enter month in number between 1 and 12: 1 January 2018 Sun Mon Tue Wed Thu Fri Sat 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31