/** ups1.java  (adds loop to handle multiple packages)
  *
  * CS7 - practicing with java functions
  *
  * This program asks the user for package details and produces a 
  * classification according to the ups rules.  To find out more
  * about these guidelines, visit:
  * 
  * http://www.ups.com/content/us/en/resources/prepare/weight_size.html
  * 
  * Issues:
  *   - DOUBLES SHOULD PROBABLY BE USED FOR EXTRA PRECISION
  */

// Javadoc comments are also used.  See p.131 in JBD.
 
import tio.*;

class ups1 {

	/** main() handles the top level control.  It calls various
	  * methods to determine the proper classification for the
	  * user's packages.
	  */
	public static void main (String[] args) {
		
		char answer='y';	// user's choice.
		int weight, height, width, length;

		while (answer=='y' || answer=='Y') {

		  // get the package specifications
		  System.out.println("Please enter the package specifications."); 
		  weight = getPosInt("  weight (lbs): ");
		  height = getPosInt("  height  (in): ");
		  width  = getPosInt("  width   (in): ");
		  length = getPosInt("  length  (in): ");
		  System.out.println();

		  // for testing
		  System.out.println("Got: h=" + height + " wt=" + weight +
		  		" wd=" + width + " ln=" + length);

		  System.out.println();
		  System.out.print("Do you have another package to classify? (y/n) ");
		  Console.in.readLine();		// flush out the CR
		  answer = (char) Console.in.readChar();
		}


	} // end main()


	/** getPosInt() reads an integer from the user and rereads while the
	  * number is not positive.
	  *
	  * @param prompt The string to present to the user prior to input.
	  * @return The positive integer.
	  */
	public static int getPosInt(String prompt) {
		System.out.print(prompt);
		int n = Console.in.readInt();
		while (n <= 0) {
		  System.out.print("Please enter a postive value: ");
		  n = Console.in.readInt();
		}
		return n;
	} // end getPosInt()

} // end ups class
	

/* SAMPLE RUN:
 *
$ java ups1
Please enter the package specifications.
  weight (lbs): 18
  height  (in): 0
Please enter a postive value: 23
  width   (in): 29
  length  (in): 44

Got: h=23 wt=18 wd=29 ln=44

Do you have another package to classify? (y/n) y
Please enter the package specifications.
  weight (lbs): 1
  height  (in): 2
  width   (in): 3
  length  (in): 4

Got: h=2 wt=1 wd=3 ln=4

Do you have another package to classify? (y/n) n
$

*/