[code = java] import java.util.Scanner; public class PrintCalenderShell { public

Question

[code = java]

import java.util.Scanner;
public class PrintCalenderShell
{
   public static void main(String[] args)
   {
Scanner kb = new Scanner(System.in);
//prompt the user to enter the year
   boolean repeat = true;
   while (repeat)//repeat as long as the user wants to
   {
int year =0;
//loop as long as the user is entering an invalid year less than 1800
while(year <1800)
{
   System.out.println("Enter a valid year after 1800");
   //loop as long as the user is entering an input other than integer
   while (!kb.hasNextInt())
   {
System.out.println("Enter a valid year after 1800:");
kb.next();
   }
   year = kb.nextInt();
}
//printing the calender for each month of the year
for (int i =1; i<=12; i++)
   {
//call the method printMonth with the parameters year and i
printMonth(year, i);

}
System.out.println("Do you have another year to print the calender:yes/no");
String answer = kb.next();
if (answer.equalsIgnoreCase("no"))
repeat = false;
   }
  
   }
   //this method prints the body of the calender for the given month
   public static void printMonth(int year, int month)
   {
//call the method printTitle with the values year and month
printMonthTitle(year, month);
//call the method printMonthBody with the values year and month
printMonthBody(year, month);
  
   }
   //this method prints the title of the days in each week(sunday Mon Tues Wed Thur Fir Sat)
   public 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");
   }
   //this method outputs the calender for each month of the year
   public static void printMonthBody(int year, int month)
   {
//call the method getStartDay to get the start day for each month of the year
int startDay = getStartDay(year, month);
print(startDay, year, month);
//call the method print to print the calender for the month and pass the first day of the month as the parameter
   }
  
   public static void print(int startDay, int year, int month)
   {
   int start = getStartDay(year, month);
// call the method getNumberOfdaysInMonth to finde out the number of the days in the month
   int numOfDaysInMonth = getNumberOfDaysInMonth(year, month);
   for(int i=0; i<start; i++)
   {
   System.out.print(" ");
   }
   //use a for loop to print spaces up to the start day for each month
   for(int i=1; i<=numOfDaysInMonth; i++)
   {
System.out.printf("%4d", i);
  
//use another for loop to print the rest of the days in the calender
if((i+start)%7 ==0)
{
System.out.println();
}
   }
   System.out.println();

   //if the month is November calculate the thanksgiving day and output }
   }
  
  
   //this method calculates the date for thanksgiving, you need to use
   //a sitch statment
   public static int thanks(int startDay)
   {
//int thanks =(11-startDay)%7+22)

return 0;
   }

   public static String getMonthName(int month)
   {
String monthName = "";
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 = "Aubuest"; break;
   case 9: monthName = "September"; break;
   case 10: monthName = "October"; break;
   case 11: monthName = "November"; break;
   case 12: monthName = "December"; break;
}
   return monthName;
}
  
   //this method returns the start day of the month
   public static int getStartDay(int year, int month)
   {
//call the method getTotalNumberOfDays and store it in a variable called start
int start = getTotalNumberOfDays(year, month);
start= start+3;
//add 3 to the variable start
return start%7;
  
   }
   //returns the total number of the days up to the given month in the given year
   public static int getTotalNumberOfDays(int year, int month)
   {
int sum = 0;
//for loop goes from 1800 up to the year
for(int i=1800; i<=year; i++)
{
   if(isLeapYear(i))
{
sum = sum+366;
   }else{
sum = sum+365;
   }
}
//add number of days in the year to sum, call the method leapyear
for(int i=1; i<month; i++)
{
   sum = sum+getNumberOfDaysInMonth(year, i);
}
return sum;
   }
  
   //use this method from the last HW
   public static int getNumberOfDaysInMonth(int year, int month)
   {
int days = 0;
switch(month)
{
   case 1: days = 30;
   break;
   case 2: if(isLeapYear(year)){
   days = 29;
   }else{
   days = 28;
   }break;
   case 3: days = 31;
   break;
   case 4: days = 30;
   break;
   case 5: days = 31;
   break;
   case 6: days = 30;
   break;
   case 7: days = 31;
   break;
   case 8: days = 31;
   break;
   case 9: days = 30;
   break;
   case 10: days = 31;
break;
   case 11: days = 30;
break;
   case 12: days = 31;
break;
  
   }
   return days;
}

   public static boolean isLeapYear(int year)
   {
   return(year %400==0 || year%4==0 && year%100!=0);

   }
}

[/code]

Explanation / Answer

// PrintCalendar.java: Print a calendar for a given month in a year
import java.util.Scanner;

public class PrintCalendar {
/** Main method */
public static void main(String[] args) {
    // Prompt the user to enter year
    Scanner reader = new Scanner(System.in);
System.out.println("Enter the Year number");
//get user input for a
int year=reader.nextInt();
    for(int i=1; i<13;i++)
    {
    printMonth(year, i);
    }
  
    System.exit(0);
}

/** Print the calendar for a month in a year */
static void printMonth(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 numOfDaysInMonth = getNumOfDaysInMonth(year, month);

    // Print headings
    printMonthTitle(year, month);

    // Print body
    printMonthBody(startDay, numOfDaysInMonth);
}

/** 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;
    long totalNumOfDays = getTotalNumOfDays(year, month);

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

/** Get the total number of days since Jan 1, 1800 */
static long getTotalNumOfDays(int year, int month) {
    long 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 Jan to the month prior to the calendar month
    for (int i = 1; i < month; i++)
      total = total + getNumOfDaysInMonth(year, i);

    return total;
}

/** Get the number of days in a month */
static int getNumOfDaysInMonth(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)
      if (isLeapYear(year))
        return 29;
      else
        return 28;

    return 0; // If month is incorrect.
}

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

    return false;
}

/** Print month body */
static void printMonthBody(int startDay, int numOfDaysInMonth) {
    // 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 <= numOfDaysInMonth; i++) {
      if (i < 10)
        System.out.print("   " + i);
      else
        System.out.print(" " + i);

      if ((i + startDay) % 7 == 0)
        System.out.println();
    }

    System.out.println();
}

/** Print the month title, i.e. 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;
}
}

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