import java.util.*;

public class Robust {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int age = getInt(console, "How old are you? ");
        System.out.println(age);
        int guess = getIntBetween(console, "guess? ", 1, 100);
        System.out.println(guess);
    }

    public static int getIntBetween(Scanner console,
                                    String prompt,
                                    int low, int high) {
        int response;
        response = getInt(console, prompt);
        while (response < low || response > high) {
            System.out.println("enter an integer between " +
                               low + " and " + high);
            response = getInt(console, prompt);
        }
        return response;
    }

    public static int getInt(Scanner console, String prompt) {
        System.out.print(prompt);
        while (!console.hasNextInt()) {
            console.next();
            System.out.println("That is not an integer.  " + 
                               "Please try again.");
            System.out.print(prompt);
        }
        return console.nextInt();
    }
}