for (int i = 0; i < 5; i++)
{
       high =  high*4/5;
}
Console.WriteLine("球弹起第5次的高度为：{0}",high);

int sum1 = 0;
int sum2 = 0;
string ren1;
string dn1;
for(int i = 0 ;i<3;i++)
{
    Random r = new Random();
    int dn = r.Next(3);//插入0,1,2中的一个随机数字，将其赋给电脑
    Console.WriteLine("请输入你的：0-剪刀，1-石头，2-布");
    int ren = int.Parse(Console.ReadLine());

    if (dn - ren == -1 || dn - ren == 2)
        sum1++;
    else
        sum2++;
                
    if (ren == 0)
        ren1 = "剪刀";
    else if (ren == 1)
        ren1 = "石头";
    else
        ren1 = "布";

    if (dn == 0)
        dn1 = "剪刀";
    else if (dn == 1)
        dn1 = "石头";
    else
        dn1 = "布";

    Console.WriteLine("电脑出{0}，你出{1}", dn1,ren1);

}
if (sum1 > sum2)
    Console.WriteLine("你赢了");
else if (sum2>sum1)
    Console.WriteLine("电脑赢了");
else 
    Console.WriteLine("平局");

int sum = 0;
for (int i = 0; i < 100; i++)
{
   if (i%7==0||i%10==7||i/10==7)
       sum = sum+i;
}
Console.WriteLine(sum);

int ou = 0;
int ji = 0;
for (int i = 1; i < 101; i++)
{
       if (i % 2 == 0)
           ou = ou + i;
       else
           ji = ji + i;
}
Console.WriteLine("偶数和为{0},奇数和为{1}", ou, ji);