/*
CSE 142, Autumn 2007, Marty Stepp
This program reads a file of temperatures and displays
the change in temperature between neighboring days.
It is an example of an "inchworm" fencepost solution.
*/

import java.io.*;
import java.util.*;  // for Scanner

public class Temperatures {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner input = new Scanner(new File("temps.txt"));
        
        // need to examine 2 numbers at each pass, but only advance by 1
        int temp1 = input.nextInt();
        while (input.hasNextInt()) {
            int temp2 = input.nextInt();
            System.out.println("Temp changed by " + (temp2 - temp1) + " deg F");
            temp1 = temp2;
        }
    }
}