// Helene Martin, CSE 142
// Displays changes in temperature based on a data file.

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

public class Temperatures {
	public static void main(String[] args) throws FileNotFoundException {
		//File f = new File("weather.txt");
		Scanner input = new Scanner(new File("weather.txt"));
		
		double temp1 = input.nextDouble();
		//for (int i = 0; i < 7; i++) { only works for one file!
		while (input.hasNext()) { // read until the very end of the file
			if (input.hasNextDouble()) { // only process doubles
				double temp2 = input.nextDouble();
				System.out.println(temp1 + " to " + temp2 + ", change = " + (temp2 - temp1));
				
				temp1 = temp2;
			} else {
				input.next(); // discard any non-double
			}
		}
	}
}