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Friday, 19 August 2016

Chapter 5 Exercise 28, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

**5.28 (Display the first days of each month) Write a program that prompts the user to enter the year and first day of the year, and displays the first day of each month in the year. For example, if the user entered the year 2013, and 2 for Tuesday, January 1, 2013, your program should display the following output:

January 1, 2013 is Tuesday
...
December 1, 2013 is Sunday

import java.util.Scanner;
 
public class ProgrammingEX5_28 {
 
 public static void main(String[] args) {
 
  String sMonth, sDay;
 
  Scanner input = new Scanner(System.in);
  // Enter loan amount
  System.out.print("Enter year:");
  int year = input.nextInt();
  System.out.print("Enter day (1 for Monday, 2 for Tuesday and so on):");
  int day = input.nextInt();
  // Going through each month
  for (int month = 1; month <= 12; month++) {
   // calculating number of days
   int length = 30 + ((month + (int) (month / 8.0)) % 2);
   if (month == 2) {
    if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
     length = 29;
    } else {
     length = 28;
    }
   }
 
   // Processing month
 
   switch (month) {
   case 1:
    sMonth = "January";
    break;
   case 2:
    sMonth = "February";
    break;
   case 3:
    sMonth = "March";
    break;
   case 4:
    sMonth = "April";
    break;
   case 5:
    sMonth = "May";
    break;
   case 6:
    sMonth = "June";
    break;
   case 7:
    sMonth = "July";
    break;
   case 8:
    sMonth = "August";
    break;
   case 9:
    sMonth = "September";
    break;
   case 10:
    sMonth = "October";
    break;
   case 11:
    sMonth = "November";
    break;
   case 12:
    sMonth = "December";
    break;
   default:
    sMonth = "";
   }
 
   // Calculating day
 
   day = (day) % 7;
 
   switch (day) {
   case 1:
    sDay = "Monday";
    break;
   case 2:
    sDay = "Tuesday";
    break;
   case 3:
    sDay = "Wednesday";
    break;
   case 4:
    sDay = "Thursday";
    break;
   case 5:
    sDay = "Friday";
    break;
   case 6:
    sDay = "Saturday";
    break;
   case 0:
    sDay = "Sunday";
    break;
   default:
    sDay = "";
   }
 
   System.out.println(sMonth + " 1, " + year + " is " + sDay);
   day += length;
  }
 }
}

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