import java.util.*;									// for Scanner

public class ExceptionUser							// uses the OutOfRangeException class
{
	public static void main(String[] args)
	{
		Scanner input=new Scanner(System.in);		// set up for keyboard input
		int testScore, total=0, number;				// number will be the number of test scores to input
		double average;
													// inform the user of instructions for the program
		System.out.println("Please enter a series of test scores and I will compute the average.\nEach test score needs to be between 0 and 100.\nHow many test scores are there?");
		try {										// try to get the number of tests, must be between 1 and Integer.MAX_VALUE (about +2 billion)
			number=input.nextInt();
			if(number<=0) throw new OutOfRangeException("number of test scores (variable name: number)", number, 1);	// if out of range, throw exception
			for(int i=0;i<number;i++)				// otherwise iterate number times
			{
				try {								// try to get the next test score (between 0 and 100)
					System.out.println("Enter test score");
					testScore=input.nextInt();
					if(testScore<0||testScore>100) throw new OutOfRangeException("testScore", testScore, 0, 100);	// if out of range (0..100) throw exception
					total+=testScore;				// otherwise add legal score to total
				}
				catch(OutOfRangeException e) {		// catch an out of range test score
					System.out.println(e + "\nTry again.");
					i--;							// reset i by one because of incorrect input
				}
			}										// since the try-catch is in a for loop, a wrong test score can be handled by getting a new one until the user gets it right
			average=(double)total/number;
			System.out.println("The average of " + number + " test scores is " + average);
		}
		catch(OutOfRangeException e)				// catches a bad input for number (1..MAX_VALUE) 
		{
			System.out.println(e);					// in this case, the program terminates (we could have wrapped this inside a do-while loop if desired)
		}
	}
}