用C#代码实现二进制与十进制的互相转换

代码如下：

 

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class Program     {         static void Main(string[] args)         {               int mark = 19;             int tem = ToErJin(mark);             Console.WriteLine("转成二进制后：" + tem);  // 打印“转成二进制后：10011”               int mark2 = 10011;             int tem2 = ToShijin(mark2);             Console.WriteLine("转成十进制后：" + tem2);// 打印“转成十进制后：19”         }           /// <summary>         /// 转换为二进制         /// </summary>         /// <param name="value"></param>         /// <returns></returns>         public static int ToErJin(int value)         {             int temp = 0;             int shang = 1;             int yushu;             while (shang != 0)             {                 shang = (int)value / 2;                 yushu = value % 2;                 value = shang;                 temp += yushu;                 if (shang != 0)                 {                     temp = temp * 10;                 }             }             //最后将 temp 倒序             string tempStr = temp.ToString();             int tempLength = tempStr.Length;             string resultStr = string.Empty;             for (int i = 0; i < tempLength; i++)             {                 resultStr = tempStr[i] + resultStr;             }             return int.Parse(resultStr);         }           /// <summary>         /// 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 + ...）         /// </summary>         /// <param name="value"></param>         /// <returns></returns>         public static int ToShijin2(int value)         {             int temp = 0;             int shang = value;             int yushu;             int mark = 0;             while (shang != 0)             {                 yushu = shang % 10;                 shang = shang / 10;                 temp += yushu * (int)Math.Pow(2, mark);                 mark++;             }             return temp;         }           /// <summary>         /// 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）         /// </summary>         /// <param name="value"></param>         /// <returns></returns>         public static int ToShijin(int value)         {             string strValue = value.ToString();             int valueLength = strValue.Length;             int result = 0;             for (int i = 0; i < valueLength; i++)             {                 result += int.Parse(strValue[i].ToString()) * (int)Math.Pow(2, valueLength - 1 - i);             }             return result;         }     }