static void Main(string[] args)
{
Random rd = new Random();
int num = rd.Next(10000000, 99999999);
System.Console.Write("随机8位 "+num);
char[] chrArr = num.ToString().ToArray();
for (int i = 0; i < chrArr.Length / 2; i++)
{
char temp = chrArr[i];
chrArr[i] = chrArr[chrArr.Length - i-1];
chrArr[chrArr.Length - i - 1] = temp;
}
System.Console.Write(" 逆序 ");
foreach (char cc in chrArr)
System.Console.Write(cc);
System.Console.Read();
}