doublestack.java

实现4个数的24点计算 也可输入4个1-9的数字

/**
 * @(#)DoubleStack.java
 *
 *
 * @author 
 * @version 1.00 2007/4/25
 */


public class DoubleStack {
	private int i;
	private double[] sign1=new double[40];
    public DoubleStack() {
    	i=-1;
    }
    public void Push(double ch)
    {
    	if(i!=39)
    		sign1[++i]=ch;
    	else System.out.println("the stack is full");
    }
    public double Pop()
    {
    	assert(!IsEmpty());
    		return sign1[i--];

    }
    public boolean IsEmpty()
    {
    	return i==-1;
    }
    public void MakeEmpty()
	{
		i=-1;
	}
}