#编码
Console.WriteLine("玩游戏晋级");

 int b=1;//局数

int c=0;//80分次数

do

 { Console.Write("你在玩第{0}局,分数是:", b);

string str_goal = Console.ReadLine();

try

 {

 int goal = Convert.ToInt32(str_goal);

 if (goal > 80)

 {

c++;

}

b++;

 if (b > 5)

{

Console.WriteLine("游戏结束");

}

else

 {

Console.Write("是否下一局（yes/no）:");

 string answer = Console.ReadLine();

 if (answer == "no")

{

Console.WriteLine("游戏结束"); break;

 }

}

 }

 catch

{

Console.WriteLine("输入错误");

 }

 }

while (b <= 5);

 double pingjun = c / 5.0;

if (b > 5)

 {

 if (pingjun > 0.8)

{

 Console.WriteLine("晋级一级");

}

 else if (pingjun > 0.6)

 {

Console.WriteLine("晋级二级");

 }

 else

{ Console.WriteLine("晋级失败");

 }

 }

 else

 { Console.WriteLine("未完成");

 }

Console.ReadKey();

#效果