03.队列

 1 public class DecConvert 
 2     {
 3         //N为需进行转换的数字，D为转换成的进制
 4         public   static string  Convert(int N,int D)
 5         {
 6             if (D<2||D>16)
 7             {
 8                 throw new ArgumentOutOfRangeException("D","只支持2、8、10、16进制的转换！");
 9             }
10             MyStack stack = new MyStack();
11             do
12             {
13                 //取余
14                 int Residue = N % D;
15                 char c=(Residue<10)?(char)(Residue+48):(char)(Residue+55);
16                 stack.Push(c);
17             } while ((N=N/D)!=0);//当商为0时代表运算结束
18             string s = string.Empty;
19 
20             while (stack.Count>0)
21             {
22                 //弹出所有的元素
23                 s += stack.Pop().ToString();
24             }
25             return s;
26         }
27     }

 1  public class MyStack
 2     {
 3         //用于存放栈元素
 4         private object[] _array;
 5         //默认的栈容量 
 6         private const int _defaultCapactity = 10;
 7         private int _size;
 8 
 9 
10         public MyStack()
11         {
12             this._array=new object[_defaultCapactity];
13             this._size = 0;
14         }
15 
16         public MyStack(int initalCapacity)
17         {
18             if (initalCapacity<0)
19             {
20                 throw new ArgumentOutOfRangeException("initalCapacity","栈空间容量不可为负");
21             }
22             if (initalCapacity<_defaultCapactity)
23             {
24                 initalCapacity = _defaultCapactity;
25             }
26             this._array=new object[initalCapacity];//分配栈空间
27             this._size = 0;
28         }
29 
30         //出栈
31         public virtual object Pop()
32         {
33             if (this._size==0)
34             {
35                 throw new InvalidOperationException("栈下溢");
36             }
37             object obj = this._array[--this._size];
38             this._array[this._size] = null;
39             return obj; 
40         }
41 
42         //进栈
43         public virtual void Push(object obj)
44         {
45             if (this._size==this._array.Length)
46             {
47                 //栈扩容
48                 object[] dest=new object[2*this._array.Length];
49                 Array.Copy(this._array, 0, dest, 0, this._size);
50                 this._array = dest;
51             }
52             this._array[this._size++] = obj;
53         }
54 
55         public virtual int Count
56         {
57             get { return this._size;}
58         }
59 
60         //获得栈顶元素
61         public virtual object Peek()
62         {
63             object obj = this._array[this._size];
64             return obj; 
65         }
66     }