using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 练习2
{
    class Program
    {
        static void Main(string[] args)
        {
            
            double x,sum=0,a1=0,a2=0,a3=0,a4=0,a5=0,a6=0;//ax=0初始化每一个点出现的次数为0
            Random ran = new Random();//设立随机数变量
            for(int i=0;i<20;i++)
            {
                x = ran.Next(1, 7);//建立随机数范围1-6  1<=x<7
                if(x==1)
                {
                    a1++;
                }
                else if (x == 2)
                {
                    a2++;
                }
                else if (x == 3)
                {
                    a3++;
                }
                else if (x == 4)
                {
                    a4++;
                }
                else if (x == 5)
                {
                    a5++;
                }
                else if (x == 6)
                {
                    a6++;
                }
                sum += x;
            }
            Console.WriteLine("出现的点数之和为:"+sum);
            Console.WriteLine("每个数出现的次数为:");
           
            Console.WriteLine("点数1出现的次数为:{0}次。概率为:{1}",a1,a1/20);
            Console.WriteLine("点数2出现的次数为:{0}次。概率为:{1}", a2, a2 / 20);
            Console.WriteLine("点数3出现的次数为:{0}次。概率为:{1}", a3, a3 / 20);
            Console.WriteLine("点数4出现的次数为:{0}次。概率为:{1}", a4, a4 / 20);
            Console.WriteLine("点数5出现的次数为:{0}次。概率为:{1}", a5, a5 / 20);
            Console.WriteLine("点数6出现的次数为:{0}次。概率为:{1}", a6, a6 / 20);
        }
    }
}

运行结果: