// Computer the number of days in a user-specified month

import java.util.*;

public class DaysInAMonth {
	// main application entry point
	public static void main(String[] args) { 
		final int January = 1; 	final int July = 7;
		final int February = 2;	final int August = 8;
		final int March = 3;	final int September = 9; 
		final int April = 4;	final int October = 10;
		final int May = 5; 	final int November = 11;
		final int June = 6;	final int December = 12;
		
		final int CALENDAR_START = 1852;
		
		// get an input reader
		Scanner stdin = new Scanner(System.in);
		
		// get date information of interest
		System.out.println("");
		System.out.print(" Enter year; ");
		int year = stdin.nextInt();
		System.out.print(" Enter month numeric value: ");
		int month = stdin.nextInt();
		
		// Test input
		if ((year < CALENDAR_START) || (month < 1) || ( month > 12)) {
			System.out.println("Bad Request;" + year + " " 
				+ month);
			System.exit(1);
		}
			
		// determine if year is a leap year
		boolean isDivisableBy4 = (year % 4) == 0;
		boolean isDivisableBy100 = (year % 100) == 0;
		boolean isDivisableBy400 = (year % 400) == 0;
		
		boolean isLeapYear = isDivisableBy4 
		&& ((! isDivisableBy100) || isDivisableBy400);
		
	// use month and tear information to determine the number of days 
	int days;
	switch (month){
		case January: case March: case May: case July: case August:
		case October: case December:
		days = 31;
		break;
	case April: case June: case September: case November:
		days = 30;
	case February:
		days	= isLeapYear ? 29 : 28; 
		break;
		
		default:
	days = 0; } 
	System.out.println("");
	System.out.println("Month " + month + " in year " + year
				+ " has " + days + " days");
	}
}