c#如何写怎么写有人会吗

第一题

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("第一科成绩：");
            int score1 =Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("第二科成绩：");
            int score2 = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("第三科成绩：");
            int score3 = Convert.ToInt32(Console.ReadLine());
            int total = score1 + score2 + score3;
            int avreage = total / 3;
            Console.WriteLine("三科总成绩："+ total.ToString());
            Console.WriteLine("三科平均成绩："+ avreage.ToString());
            Console.ReadKey();
        }
      
    }
}

第二题：

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("输入一个整数：");
            int a = Convert.ToInt32(Console.ReadLine());
            if (a % 2 == 0)
            {
                Console.WriteLine("no");
            }
            else
            {
                Console.WriteLine("yes");
            }
            Console.ReadKey();
        }
       
    }
}