// ****************************************************************
// Dates.java
//
// Determine whether a 2nd-millenium date entered by the user
// is valid
// ****************************************************************
import java.util.Scanner;

public class Dates
{
    public static void main(String[] args)    {
        int month, day, year;   //date read in from user
        int daysInMonth;        //number of days in month read in
        boolean monthValid, yearValid, dayValid;  //true if input from user is valid
        boolean leapYear;       //true if user's year is a leap year

        Scanner scan = new Scanner(System.in);

        //Get integer month, day, and year from user
        System.out.println("Please enter the date: month day year");
        System.out.println("what is the month?");
        month= scan.nextInt();
        System.out.println("what is the day?");
        day= scan.nextInt();
        System.out.println("what is the year?");
        year= scan.nextInt();

        int num=772;
        boolean even7=num%7==0;
        System.out.println(even7);
        System.out.println(num%7);

        //Check to see if month is valid
        monthValid=month>0&&month<=12;
        //Check to see if year is valid
        yearValid=year>=1000&&year<=1999;
        //Determine whether it's a leap year
        //it's a leap year if a) it's divisible by 400, or b) it's divisible by 4 and it's not divisible by 100.
        leapYear=year%400==0||(year%4==0&&year%100!=0);
        //Determine number of days in month
        /*
            Thirty days has September,
            April, June, and November,
            All the rest have thirty-one,
            Save February at twenty-eight,
            But leap year, coming once in four,
            February then has one day more.
        */
        if(month==9||month==4||month==6||month==11){
            daysInMonth=30;
        }else if(month==2){//feb
            if(leapYear)
                daysInMonth=29;
            else{
                daysInMonth=28;
            }
        }else{//all the rest
            daysInMonth=31;
        }

        //User number of days in month to check to see if day is valid
        dayValid=day<=daysInMonth&&day>0;
        //Determine whether date is valid and print appropriate message
        if(dayValid&&yearValid&&monthValid){
            System.out.printf("%d/%d/%d is a valid date!%n", month, day, year);
        }else{
            System.out.printf("%d/%d/%d is not a valid date!%n", month, day, year);
        }
    }
}