// Yazzy Latif
// 7/27/2020
// CSE142
// TA: Grace Hopper

// Prints out the change in temperature between days given by data stored in a file. Ignores 
// tokens that are not real numbers.

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

public class Weather {
   public static void main(String[] args) throws FileNotFoundException {
      Scanner input = new Scanner(new File("weather.txt"));
      double temp1 = input.nextDouble();
      
      // fencepost problem! 
      // n numbers we want to read
      // n - 1 differences to compute
      while (input.hasNextDouble()) {
         double temp2 = input.nextDouble();
         System.out.println("temp1: " + temp1 + ", temp2: " + temp2
                  + ", difference: " + (temp2 - temp1));
         temp1 = temp2;
      }

   }
}