package examples;

import java.util.Scanner;

/**
 * This example again will read in some scores from a user and then calculate
 * the average.  
 * 
 * As with ex5b, we are using a sentinel to determine when to stop iterating.
 * However, now we are testing the sentinel in a for loop rather than a
 * while loop, and using a boolean variable to make our test more readable.
 * Other than that the two versions are identical.  Note that although the for
 * loop works here, it looks awkward because its structure is only partially
 * utilized (no init expression and no increment expression)
 * 
 * @author Dr. Ramirez, PJ Dillon
 *
 */
public class ex5d
{
	public static void main(String[] args)
	{
		Scanner inScan = new Scanner(System.in);

		int numItems = 0;
		double currItem = 0.0;
		double sum = 0.0, ave;
		boolean validData;

		System.out.println("Enter the next item (or invalid value to quit) ");
		currItem = inScan.nextDouble();

		validData = (currItem >= 0.0 && currItem <= 100.0);
		for (  ; validData;  )
		{
			sum += currItem;
			numItems++;
			System.out.println("Enter the next item (or invalid value to quit) ");
			currItem = inScan.nextDouble();
			validData = (currItem >= 0.0 && currItem <= 100.0);
		}

		if (numItems > 0)
		{
			ave = sum / numItems;
			System.out.println("The average is " + ave);
		}
		else
			System.out.println("No data was entered");
	}
}