// Helene Martin, CSE 142
// Reads temperatures from a data file with comments
// Displays the difference in temperature between 
// adjacent data points.
import java.io.*;		// File
import java.util.*;	// Scanner

public class Temperatures {
	public static void main(String[] args) throws FileNotFoundException {
		Scanner input = new Scanner(new File("weather2.txt"));
		
		double t1 = input.nextDouble();	// fencepost
		while (input.hasNext()) {
			if (input.hasNextDouble()) {
				double t2 = input.nextDouble();
			
				System.out.println(t1 + " to " + t2 + ", change = " + (t2 - t1));
				t1 = t2;
			} else {
				input.next();	// advance beyond "bad" tokens
			}
		}
	}
}