逆时针打印矩阵

题目：输入一个矩阵，按照从外向里以顺时针的顺序依次打印出每一个数字。

例如：如果输入如下矩阵：

1              2              3              4
5              6              7              8
9              10           11           12
13           14           15           16

则依次打印出数字1 5 9 13 14 15 16 12 8 4 3 2 6 10 11 7


分析过程：思路比较简单，分为四个函数按顺序循环调用即可。

　　　　　分别是列递增，行递增，列递减，行递减。

　　　　　注意每次调用完函数后要将下个行/列总数减一。

代码如下：

代码 
  1  class Program
  2     {
  3         static void Main(string[] args)
  4         {
  5             int[,] t = new int[4,4];
  6             ArrayInput(t, 4, 4);
  7             StdPrint(t);
  8 
  9             ClockWisePrint(t);
 10         }
 11         /// <summary>
 12         /// 记录当前行长度
 13         /// </summary>
 14          private static int CurrentRows = 0;
 15         /// <summary>
 16         /// 记录当前列长度
 17         /// </summary>
 18          private static int CurrentColums = 0;
 19 
 20         static void ClockWisePrint(int[,]a)
 21         {
 22             CurrentRows = a.GetLength(0);
 23             CurrentColums = a.GetLength(1);
 24             ClockWiseColumnIncrease(a, 0, 0, CurrentRows);
 25         }
 26       /// <summary>
 27       /// 列递增遍历
 28       /// </summary>
 29       /// <param name="a"></param>
 30       /// <param name="startX"></param>
 31       /// <param name="startY"></param>
 32       /// <param name="length"></param>
 33         static void ClockWiseColumnIncrease(int[,]a ,int startX,int startY, int length)
 34         {
 35             int n = 0;
 36             for(n=0;n<length;n++)
 37             {
 38                 Console.Write(a[startX + n, startY] + " ");
 39             }
 40             if (CurrentColums > 1)
 41             {
 42                 ClockWiseRowIncrease(a, startX + n-1, startY + 1, --CurrentColums);
 43             }
 44         }
 45         /// <summary>
 46         /// 行递增遍历
 47         /// </summary>
 48         /// <param name="a"></param>
 49         /// <param name="startX"></param>
 50         /// <param name="startY"></param>
 51         /// <param name="length"></param>
 52         static void ClockWiseRowIncrease(int[,]a ,int startX,int startY, int length)
 53         {
 54             int i = 0;
 55             for(i=0;i<length;i++)
 56             {
 57                 Console.Write(a[startX, startY + i] + " ");
 58             }
 59             if (CurrentRows > 1)
 60             {
 61                 ClockWiseColumnDecrease(a, startX - 1, startY + i-1, --CurrentRows);
 62             }
 63         }
 64         /// <summary>
 65         /// 列递减遍历
 66         /// </summary>
 67         /// <param name="a"></param>
 68         /// <param name="startX"></param>
 69         /// <param name="startY"></param>
 70         /// <param name="length"></param>
 71         static void ClockWiseColumnDecrease(int[,]a ,int startX,int startY, int length)
 72         {
 73             int i = 0;
 74             for(i=0;i<length;i++)
 75             {
 76                 Console.Write(a[startX - i, startY] + " ");
 77             }
 78             if (CurrentColums > 1)
 79             {
 80                 ClockWiseRowDecrease(a, startX - i + 1, startY - 1, --CurrentColums);
 81             }
 82         }
 83         /// <summary>
 84         /// 行递减遍历
 85         /// </summary>
 86         /// <param name="a"></param>
 87         /// <param name="startX"></param>
 88         /// <param name="startY"></param>
 89         /// <param name="length"></param>
 90         static void ClockWiseRowDecrease(int[,]a ,int startX,int startY, int length)
 91         {
 92             int i = 0;
 93             for(;i<length;i++)
 94             {
 95                 Console.Write(a[startX, startY - i] + " ");
 96             }
 97             if (CurrentRows > 1)
 98             {
 99                 ClockWiseColumnIncrease(a, startX + 1, startY - i + 1, --CurrentRows);
100             }
101         }
102         /// <summary>
103         /// 输入函数
104         /// </summary>
105         /// <param name="a"></param>
106         /// <param name="x"></param>
107         /// <param name="y"></param>
108         static void ArrayInput(int[,] a,int x,int y)
109         {
110             int n = 0;
111             for(int i=0;i<x;i++)
112             {
113                 for (int j = 0; j < y; j++)
114                 {
115                     a[i, j] = ++n;
116                 }
117             }
118                 
119         }
120         /// <summary>
121         /// 标准输出
122         /// </summary>
123         /// <param name="a"></param>
124         static void StdPrint(int[,]a)
125         {
126             for(int i=0;i<a.GetLength(0);i++)
127             {
128                 for (int j=0;j<a.GetLength(1);j++)
129                 {
130                     Console.Write("\t" + a[i,j]);
131                 }
132                 Console.WriteLine();
133             }
134         }
135     }

 

posted on 2010-12-15 22:54  seek  阅读(1065)  评论(1)  编辑  收藏  举报

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