1 using System.Collections.Generic;
2
3 //位操作工具
4 public class BitTool
5 {
6 /// <summary>
7 /// 位设置
8 /// </summary>
9 /// <param name="num">检测数字</param>
10 /// <param name="pos">第几位，从1开始</param>
11 /// <returns></returns>
12 public static int BitSet(int num,ushort pos)
13 {
14 if (pos <= 0 || pos > 32)
15 {
16 return num;
17 }
18 return num | (0x00000001 << (pos - 1));
19 }
20
21 /// <summary>
22 /// 位清理
23 /// </summary>
24 /// <param name="num">检测数字</param>
25 /// <param name="pos">第几位，从1开始</param>
26 /// <returns></returns>
27 public static int BitClear(int num, ushort pos)
28 {
29 if (pos <= 0 || pos > 32)
30 {
31 return num;
32 }
33 return num & (~(0x00000001 << (pos - 1)));
34 }
35
36 /// <summary>
37 /// 位检测
38 /// </summary>
39 /// <param name="num">检测数字</param>
40 /// <param name="pos">第几位，从1开始</param>
41 /// <returns></returns>
42 public static bool BitTest(int num, ushort pos)
43 {
44 if (pos <= 0 || pos > 32)
45 {
46 return false;
47 }
48 return ((num >> (pos - 1)) & 0x00000001) == 1;
49 }
50
51 /// <summary>
52 /// 获取一个十进制数位为1的索引数组 如num = 5,则返回[1,3]
53 /// </summary>
54 /// <param name="num">数字</param>
55 /// <returns></returns>
56 public static int[] GetIndexOfBit1(uint num) {
57 List<int> indexs = new List<int>();
58 if (num == 0) {
59 return indexs.ToArray();
60 }
61 int index = 0;
62 for (uint q = num; q > 0; q = q / 2 ){
63 uint m = q % 2;
64 index++;
65 if (m == 1){
66 indexs.Add(index);
67 }
68 }
69 return indexs.ToArray();
70 }
71 }
