作业

1.求s=a+aa+aaa+aaaa+aaaaa的值，其中a是一个数字，如2+22+222+2222+22222。

 

static void Main()

{

    string s=" ";

    int m=0;

    for (int i=0;i<5;i++)

    {

         s=s+"2";

         int n=Convert.ToInt32(s);

         m=m+n;

     }

     Console.WriteLine(m);

}

2.输入一组数字，从大到小排序。

 

 static void Main(string[] args)
        {
            int[] m=new int[8];
            for (int i = 0; i < 8; i++)
            {
                m[i] = Convert.ToInt32(Console.ReadLine());
            }
            int s;
            for (int i = 0; i < 8; i++)
            {
                for (int j = i+1; j < 8; j++)
                    if (m[i] < m[j])
                    {
                        s = m[i];
                        m[i] = m[j];
                        m[j] = s;
                    }
                Console.WriteLine("     " + m[i] );
            }
           
        }