c#条件运算符的使用，判断时间是上午还是下午

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

namespace _4
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("请输入时间：");
            int t = int.Parse(Console.ReadLine());
            if (t >= 0 && t < 24)
            {
                string a = (t > 12) ? "pm" : "am";
                t = t > 12 ? t - 12 : t;
                Console.WriteLine("现在是" + t + a);
            }
            else
            {
                Console.WriteLine("您输入的时间有误，请重新输入！");
            }
            Console.ReadLine();

        }
    }
}