/*
class for caluclating decimal numbers
Copyright (C) 2009  Vegard Hammerseth <vegard@hammerseth.com> (http://vegard.hammerseth.com)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

v1.0.0
*/

import java.io.StreamTokenizer;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.lang.Math;
class decimalCalculating
{
    public static void main(String[] args) throws Exception
    {
        double num1 = 0, num2 = 0, sum, diff;
	StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
	
	/* get decimal one */
        System.out.println("Write a decimal number.");
        while (st.nextToken() != StreamTokenizer.TT_NUMBER)
        {
            System.out.println("Invalid decimal number.\nWrite a decimal number.");
        }
        num1 = st.nval;
        
	/* get decimal two */
        System.out.println("Write another decimal number.");
        while (st.nextToken() != StreamTokenizer.TT_NUMBER)
        {
            System.out.println("Invalid decimal number.\nWrite another decimal number.");
        }
        num2 = st.nval;
		
	/* calculate */
        sum = num1+num2;
        diff = num1-num2;
        diff = Math.abs(diff);
        
        System.out.println("Sum is "+sum+" and difference is "+diff);
    }
}