// Helene Martin, CSE 142
// Reads temperatures from a file and calculates the difference between each pair

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

public class Weather {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner s = new Scanner(new File("weather.txt"));
		
		double temp1 = s.nextDouble();
		while (s.hasNext()) {
			if (s.hasNextDouble()) {
				double temp2 = s.nextDouble();
				double diff = temp2 - temp1;
				System.out.println(temp1 + " to " + temp2 + ", change = " + diff);
				temp1 = temp2;
			} else {
				s.next();
			}
		} 
	}
}