判断一个整数是否是2的n次方

http://blog.csdn.net/amandag/archive/2008/12/06/3461070.aspx //判断一个整数是否是2的n次方 public static bool IsPower(int number) {     if (number <= 0)      {         return false;      }     if ((number & (number - 1)) == 0)      {         return true;      }     return false; } =================================== public static bool IsPower(int number) {     if (number <= 0)      {         return false;      }     while (true)      {         if (number == 1)          {             return true;          }         //如果是奇数         if ((number & 1) == 1)          {             return false;          }         //右移一位          number >>= 1;      }