import java.util.Scanner;

/*
  Author:  James Tam
  Version: 2015

  Learning objectives: using recursion in error checking.
*/

public class ErrorCheckingDriver
{
    public static int promptDay() 
    {
        int day = -1;
        Scanner in = new Scanner(System.in);
        System.out.print("Enter day of birth (1-31): ");
        day = in.nextInt();
        if ((day < 1) || (day > 31)) 
        {
            day = promptDay();
        }
        return(day);
    }

    public static void main (String [] args)
    {
        int birthDay = promptDay();
        System.out.println("Birthday entered: " + birthDay);
    }
}