[問題] 並未將物件參考設定為物件的執行個體
老師給了一段單向佇列的code，要改成雙向佇列(其實也就是加上一個previous)
因為之前用C有寫過類似的作業，用一樣的邏輯寫也沒有bug
但是執行後卻一直顯示"並未將物件參考設定為物件的執行個體"
我只知道哪一段程式碼出了問題，但不知道發生了甚麼事
下面附上我的code，希望版上大大不吝指教
謝謝
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace StackNodeTest
{
class Program
{
static void Main(string[] args)
{
String taken;
Stack s = new Stack(); ;
Console.WriteLine("Stack START:(Enter Number, '#' to End)\n-----");
do
{
taken = Console.ReadLine();
if (taken != "#")
{
s.push(int.Parse(taken));
}
} while (taken != "#");
do
{
int e;
s.pop(out e);
Console.WriteLine(e);
} while (s.checktop());
Console.Read();
}
}
class Stack
{
private Node Top;
private Node botton;
public Stack()
{
this.Top = null;
}
public bool push(int x)
{
Node p=new Node(x,Top);
this.Top.Setprevious(p);開發環境顯示這一行有問題
if (this.Top == null)
{
this.Top =this.botton = p;
}
else
{
this.Top = p;
}
return true;
}
public bool pop(out int x)
{
x = Top.getdata();
this.Top = Top.getnext();
return true;
}
public bool popfrombotton(out int x)
{
x = botton.getdata();
this.botton = botton.getprevious();
return true;
}
public bool checktop()
{
return this.Top != null;
}
}
class Node
{
private int data;
private Node next;
public Node previous;
public Node(int x, Node next)
{
Setdata(x);
Setnext(next);
this.previous = null;
}
public void Setdata(int x)
{
this.data = x;
}
public void Setnext(Node next)
{
this.next = next;
}
public void Setprevious(Node previous)
{
this.previous = previous;
}
public int getdata()
{
return this.data;
}
public Node getnext()
{
return this.next;
}
public Node getprevious()
{
return this.previous;
}
}
}
--
推
12/25 16:07,
12/25 16:07
推
12/25 16:56,
12/25 16:56
推
12/25 17:34,
12/25 17:34
推
12/25 17:39,
12/25 17:39
推
12/25 18:10,
12/25 18:10
推
12/25 20:07,
12/25 20:07
--
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