/*
CSE 142, Winter 2006
Friday, February 17 2006 lecture

This program reads an input file of exam score data
and displays a histogram of the data, showing how
many students earned each unique exam score.

Author: Marty Stepp (stepp at u washington edu)
*/

import java.awt.*;
import java.io.*;
import java.util.*;

public class Histogram {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner input = new Scanner(new File("930.txt"));
        
        // tally the exam scores into an array (for example,
        // counts[82] stores number of students who got 82 on exam)
        int[] counts = new int[101];
        while (input.hasNextInt()) {
            int score = input.nextInt();
            counts[score]++;
        }
        
        // set up a drawing panel to draw a graphical histogram
        DrawingPanel panel = new DrawingPanel(300, 150);
        Graphics g = panel.getGraphics();
        
        // print and draw each 
        for (int i = 0; i < counts.length; i++) {
            if (counts[i] > 0) {
                System.out.print((i + 5) + ": ");  // adds 5-point curve

                // print a star counts[i] times (draws a star for each
                // person who scored 'i' points on the exam)
                for (int j = 0; j < counts[i]; j++) {
                    System.out.print("*");
                }
                System.out.println();
                
                // draw one vertical line on the graphical histogram
                // (scaled horizontally by 2 and vertically by 5)
                g.drawLine(2 * i, 100, 2 * i, 100 - (5 * counts[i]));
            }
        }
    }
}