用C#代码实现二进制与十进制的互相转换

代码如下：

 

01 class Program
02     {
03         static void Main(string[] args)
04         {
05   
06             int mark = 19;
07             int tem = ToErJin(mark);
08             Console.WriteLine("转成二进制后：" + tem);  // 打印“转成二进制后：10011”
09   
10             int mark2 = 10011;
11             int tem2 = ToShijin(mark2);
12             Console.WriteLine("转成十进制后：" + tem2);// 打印“转成十进制后：19”
13         }
14   
15         /// <summary>
16         /// 转换为二进制
17         /// </summary>
18         /// <param name="value"></param>
19         /// <returns></returns>
20         public static int ToErJin(int value)
21         {
22             int temp = 0;
23             int shang = 1;
24             int yushu;
25             while (shang != 0)
26             {
27                 shang = (int)value / 2;
28                 yushu = value % 2;
29                 value = shang;
30                 temp += yushu;
31                 if (shang != 0)
32                 {
33                     temp = temp * 10;
34                 }
35             }
36             //最后将 temp 倒序
37             string tempStr = temp.ToString();
38             int tempLength = tempStr.Length;
39             string resultStr = string.Empty;
40             for (int i = 0; i < tempLength; i++)
41             {
42                 resultStr = tempStr[i] + resultStr;
43             }
44             return int.Parse(resultStr);
45         }
46   
47         /// <summary>
48         /// 转换为十进制（主要算法：个位数 * 2的零次方 + 十位数 * 2的一次方 + 百位数 * 2的二次方 + ...）
49         /// </summary>
50         /// <param name="value"></param>
51         /// <returns></returns>
52         public static int ToShijin2(int value)
53         {
54             int temp = 0;
55             int shang = value;
56             int yushu;
57             int mark = 0;
58             while (shang != 0)
59             {
60                 yushu = shang % 10;
61                 shang = shang / 10;
62                 temp += yushu * (int)Math.Pow(2, mark);
63                 mark++;
64             }
65             return temp;
66         }
67   
68         /// <summary>
69         /// 二进制转十进制的另一种方法（主要算法：1110111 = 1 * 2~6 + 1 * 2~5 + 1 * 2~4 + 0 * 2~3 + 1 * 2~2 + 1 * 2~1 + 1 * 2~0）
70         /// </summary>
71         /// <param name="value"></param>
72         /// <returns></returns>
73         public static int ToShijin(int value)
74         {
75             string strValue = value.ToString();
76             int valueLength = strValue.Length;
77             int result = 0;
78             for (int i = 0; i < valueLength; i++)
79             {
80                 result += int.Parse(strValue[i].ToString()) * (int)Math.Pow(2, valueLength - 1 - i);
81             }
82             return result;
83         }
84     }

 

谢谢阅读！

posted @ 2011-04-12 23:29  jxs  阅读(382)  评论(0)    收藏  举报