// CSE 142 Winter 2008, 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.*;    // for File
import java.util.*;  // for Scanner

public class Temperatures {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner input = new Scanner(new File("temperatures.txt"));
		
		int temp1 = input.nextInt();
		int temp2;
		while (input.hasNextInt()) {
			temp2 = temp1;
			temp1 = input.nextInt();
			System.out.println("Temp changed by " + (temp2 - temp1) + " deg F");
		}
	}
}