/** Let's experiment with some exception handling in Java
 *  Read a menu, and find the average price of the items.
 */
import java.io.*;
import java.util.*;

public class ReadMenu
{
  public static void main(String [] args) throws IOException
  {
    BufferedReader in = new BufferedReader(new FileReader("menu.txt"));

    // Read lines of text from the menu file.  Each line contains an item
    // and a price.  Keep track of sum so we can figure the average.
    double sumPrices = 0.0;
    int numItems = 0;
    while(true)
    {
      String line = in.readLine();
      if (line == null)
	break;

      // Let's assume we can separate the tokens by a space.
      // Later, to make the program more robust, we can handle menu items
      // that are more than one word.
      StringTokenizer tok = new StringTokenizer(line, " ");

      tok.nextToken();
      sumPrices += Double.parseDouble(tok.nextToken());
      ++numItems;

    }
    in.close();

    double average = sumPrices / numItems;
    System.out.printf("Average menu item price is $ %.2f\n", average);
  }
}