charstack.java

实现4个数的24点计算 也可输入4个1-9的数字

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


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