// This program illustrate the SWITCH statement; it validates
// if a date is entered in the required format (MM/DD/YYYY), 
// and checks if it is a valid date. It also reports if the
// year is a leap year. 

import java.util.Scanner;
import java.util.StringTokenizer;

class SwitchExample2 {

   public static void main(String[] args){
	
      Scanner scan = new Scanner (System.in);
   
      StringTokenizer date; 
      String month, day, year;
      int m, d, y;
      boolean error = false;
      boolean leapYear = false;
	
      System.out.print ("Input a date in the format MM/DD/YYYY   ");		
      date = new StringTokenizer(scan.nextLine(), "/");

      // split up date into month, day and year
	
      month = date.nextToken(); 
      day   = date.nextToken();
      year  = date.nextToken();

      // convert strings month, day and yeat to integers

      m = Integer.parseInt(month);
      d = Integer.parseInt(day);
      y = Integer.parseInt(year);
		
      switch (m) {
		
          case 1:		
       	  case 3:
          case 5:
          case 7:
          case 8:
          case 10:
          case 12:  if (d > 31 || d < 1) {
                      System.out.println ("Wrong day value. Must be a number" + 
                         " between 1 and 31 for the specified month."); 
                      error = true;
                    }
                    break;
	  case 4:
	  case 6:
	  case 9:
	  case 11:  if (d > 30 || d < 1) {
                      System.out.println ("Wrong day value. Must be a number" + 
                         " between 1 and 30 for the specified month."); 
                      error = true;
                    }
                    break;
	  case 2: if (y%4 == 0) 
		    leapYear = true; 
                  if ((leapYear) && ((d > 29) || (d < 1))) {
                    System.out.println ("Wrong day value. Must be a number" + 
                         " between 1 and 29 for the specified month.");
                    error = true;
                  }
                  else if ((!leapYear) && ((d > 28) || (d < 1))) {
                    System.out.println ("Wrong day value. Must be a number" + 
                         " between 1 and 28 for the specified month.");
                    error = true;
                    }
                  break;

	  default:  System.out.println ("Wrong month value. Must be a " +
                       "number between 1 and 12"); error = true;
      }

     if (leapYear) 
	System.out.println (y + " is a leap year");

     if (!error)
	System.out.println ("The date is valid and is in the required format.");
   }
}