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

// This program reads from a file of temperatures (i.e. doubles) and reports
// the change between the temperatures.  weather.txt has only doubles.  
// weather2.txt has our temperatures but also some other data we don't want
// to process.  This program handles both types of data files.
public class Temperatures {
    public static void main(String[] args)
        throws FileNotFoundException {
        File f = new File("weather2.txt");
        Scanner input = new Scanner(f);
        
        double previous = input.nextDouble();
        
        while (input.hasNext()) {
            if (input.hasNextDouble()) {
                double next = input.nextDouble();        
                System.out.printf("%.1f to %.1f, change = %.1f\n",
                    previous, next, (next - previous));
                previous = next;
            } else {
                input.next();
            }
        }
    }
}