/* Read integers between 0 and 9 from a text file, and save them in 
   an array. Count the number of occurences of each value. */

import java.io.*;
import java.util.Scanner;

class ArrayOfCounters {

   public static void main(String[] args) throws IOException {

      Scanner inputFile = new Scanner (new File ("digits.txt"));

      int number;
      int[] numbers = new int[10];

      for (int index = 0; index < numbers.length; index++) 
         numbers[index] = 0;

      do {
         number = inputFile.nextInt();
         // Validate input and record frequency
         if (number != -1) {
            if (number >= 0 && number < 10) {
               numbers[number]++;
            } 
            else {
               System.out.print("Input ignored.");
            }
         }
      } while (number != -1);

      System.out.println();

      for (int index = 0; index < numbers.length; index++) {
         if (numbers[index] != 0)
            System.out.println ("The number of " + index +
                   "'s is " + numbers[index]);
      }

   }  

}