/* NextDate.java
 * Author: Kris og Anne
 * Translated by: Ida
 * Exercise 11 for the 4th week
 * Determines the date of the next day
 */

import cs1.Keyboard;

public class NextDate
{
  public static void main(String[] args)
  {
    int daysinmonth=0,day=0,month=0,year=0;

    // get the year
    do 
    {
      System.out.print("Type the year (between 2000 and 2999): ");
      year = Keyboard.readInt();
    }
    while (year<2000 || year>2999);

    // get the month
    do 
    {
      System.out.print("Type the month: ");
      month = Keyboard.readInt();
    }
    while (month<1 || month>12);


    //calculate the number of days in the month
    switch(month)
      {
        case 1: case 3: case 5: case 7: case 8: case 10: case 12: 
          daysinmonth=31;
          break;
        case 2:
          {
            if ( ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0) )//Leap year!!
              daysinmonth=29;
            else
              daysinmonth=28;
          }
	  break;
	default:
          daysinmonth=30;
      }

    //get the day
    do 
    {
      System.out.print("Type the day: ");
      day = Keyboard.readInt();
    }
    while (day<1 || day>daysinmonth);	       

    System.out.print("The day after " + day + "/" + month + " " + year + " is ");

    //determine the date of the next day, and write the result
    if (day==daysinmonth)
      {
	day=1;
	if (month!=12)//not December
	  month++;
	else
	  {
	    month=1;
	    year++;
	  }
      }
    else day++;
		
    System.out.println(day + "/" + month + " " + year);
  } 
}