/*
 * T01n11.java -- This program prints the odd integers from 1 through
 * the value entered by the user.  This program uses a do-while loop
 * to repeatedly get user input, until that input is acceptable.
 * 
 * Note that the program handles lists of just one value as special
 * cases, again to improve the output for the benefit of the program's user.
 * (The logic of programs is often straight-forward; the little details
 * -- such as pretty output and error-checking -- are what consume a lot 
 * of programmers' time.)
 */

import java.util.*;

public class T01n11
{
    public static void main (String [] args)
    {
        final int INCREMENT = 2;   // an odd# + 2 = the next odd#

        int counter,        // iteration control variable for the while loop
            limit;          // sequence endpoint ended by the user

        Scanner keyboard = new Scanner (System.in);

        System.out.print("This program will display all of the odd "
                       + "integers from one through\nany positive "
                       + "integer that you enter.\n\nPlease enter "
                       + "your integer : ");

                // To force the user to give us a positive integer, we
                // rely on the following loop.  We don't need a priming
                // read as we do with a while used in this situation,
                // but we have to add an IF statement to tell the user
                // what's going on.

        do {
            limit = keyboard.nextInt();
            if (limit <= 0)
                System.out.print("I'm sorry; " + limit + " is not a positive "
                               + "integer.\n\nPlease enter an integer value "
                               + "greater than 0 : ");
        } while (limit <= 0);

                // If 1 is the only odd integer in the list, we need to
                // handle it specially for the output to look good.

        if (limit < 3) {
            System.out.println("\nThe only odd integer between 1 and " + limit
                             + " is 1.");
        } else {

                // Finally:  We have a large enough positive integer to
                // make a loop worth using!  Note that the loop
                // stops one iteration 'short' of the end of the list,
                // to allow us to use a separate print to terminate the
                // list neatly.

            System.out.print("\nThe odd integers from 1 through " + limit
                           + " are :\n\t");

            counter = 1;
            while (counter <= limit - INCREMENT) {
                System.out.print(counter + ", ");
                counter = counter + INCREMENT;
            }

            System.out.println("and " + counter + ".");
        }
    }

}