/* this is a variation of program 7.1 on page 276.  Here, we input a number of test scores from the user ending with a -1 (or any negative number), find the highest grade, 
 * and determine the letter grade cutoffs as max-10 for the cutoff for an A, max-20 for B, etc, and then look at all the scores to count the number of As, Bs, etc.  */

import java.util.Scanner;

public class Prog7_1
{
	public static void main(String[] args)
	{
		int[] scores = new int[100];					// assume no more than 100 scores
		int temp;										// the next input score
		int number = 0;									// the number of scores so far input, used to control our for loops
		Scanner in = new Scanner(System.in);			
		
		System.out.print("Enter the first test score, enter -1 to exit   ");		// get the first score
		temp = in.nextInt();
		while(temp>=0&&number<100)						// iterate while the scores are legal (>= 0) and we haven't filled the array yet
		{
			scores[number]=temp;						// place the latest input into the array
			number++;									// and now that the array has 1 more element, increment number
			System.out.print("Enter the next test score, enter -1 to exit   ");
			temp = in.nextInt();	
		}
		int max = scores[0];							// now locate the largest value, we start assuming its the first value
		for(int i=1;i<number;i++)						// iterate through the rest of the array replacing max with each larger value
			if(scores[i]>max) max=scores[i];
		int aScore = max-10;							// compute the grade breakdown
		int bScore = max-20;
		int cScore = max-30;
		int dScore = max-40;
		int numA = 0, numB = 0, numC = 0, numD = 0, numF = 0;		// counters for the number of A scores, B scores, etc
		for(int i=0;i<number;i++)						// iterate through all test scores and count the number that are in the A range, B range, etc
			if(scores[i]>=aScore) numA++;
			else if(scores[i]>=bScore) numB++;
			else if(scores[i]>=cScore) numC++;
			else if(scores[i]>=dScore) numD++;
			else numF++;								// if not in any of the above ranges, it must be an F
		// output the results
		System.out.println("Of " + number + " scores entered, " + numA + " were As, " + numB + " were Bs, " + numC + " were Cs, " + numD + " were Ds and " + numF + " were Fs");
	}
}