// Helene Martin, CSE 142
// Computes and displays the difference between pairs of
// adjacent temperatures.
import java.io.*;
import java.util.*;

public class Weather {
   public static void main(String[] args) throws FileNotFoundException {
      File weather = new File("weather.txt");
      Scanner fileScan = new Scanner(weather);
      
      double temp1 = fileScan.nextDouble(); // fencepost
      //for (int i = 0; i < 7; i++) {
      // keep going as long as there are data to read
      while (fileScan.hasNext()) {
         if (fileScan.hasNextDouble()) {
            double temp2 = fileScan.nextDouble();
            
            System.out.println(temp1 + " to " + temp2 + ", change = " +
            (temp2 - temp1));
            
            temp1 = temp2;
         } else {
            fileScan.next(); // reads and throws away any Strings from the file
         }
      }
   }
}