// CSE 142 Lecture 14
// Files
// Scans a file of temperature data and prints the change
// in temparature from day to day.

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

public class Weather {
	public static void main(String[] args) throws FileNotFoundException {
		File f = new File("weather.txt");
		Scanner input = new Scanner(f);
		
		// The problem stated the file starts with a whole number.
		double prev = input.nextDouble();
		// While there are more tokens in the file.
		while (input.hasNext()) {
			if (input.hasNextDouble()) {
				double cur = input.nextDouble();
				System.out.printf("%.2f to %.2f, change = %.2f\n",
						prev, cur, cur - prev);
				prev = cur;
			} else { // some random String...just throw it away
				input.next();
			}
		}
	}
}