import cs1.Keyboard;
import java.io.*;
import java.util.*;

// Compute a readability index from a text stored in a file
class readability {

  public static void main (String param[]) throws IOException {
  // Establish input text file
    System.out.println("Type file name");
    String f = Keyboard.readString();
    int sentences = 0, words = 0;    
    // open the file and get the first line of text
    BufferedReader in = new BufferedReader(new FileReader(f));
    String line = in.readLine();
  // Read a series of lines of text   
    while(line != null) {
        StringTokenizer t = new StringTokenizer(line);
    // Divide the line into individual words
        while (t.hasMoreTokens()) {
          String w = t.nextToken();
          char c = w.charAt(w.length()-1);
          if (c=='.'|| c=='?' || c=='!') {
             sentences = sentences+1;
             w = w.substring(0,w.length()-1); 
          }
          words = words + 1;
        }
    // read the next line of text
        line = in.readLine();
      }
  // Compute average sentence length and display results
    System.out.print("Results: ");
    System.out.println( words + " words and " + sentences + " sentences.");
    int length = words / sentences;
    if (length <= 8) System.out.print ("4th grade");
    else if (length <= 11) System.out.print ("5th grade");
    else if (length <= 14) System.out.print ("6th grade");
    else if (length <= 17) System.out.print ("7th grade");
    else if (length <= 24) System.out.print ("High school");
    else System.out.print ("College");
    System.out.println (" level: " + length + " words per sentence");
    in.close(); 
  }
}