/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee kongyeeku@163.com
 * @version  1.0
 */

public class TestSub
{
	public static void main(String[] args) 
	{
		double a = 5.2;
		double b = 3.1;
		double sub = a - b;
		//sub的值為2.1
		System.out.println(sub);

	}
}