占位符的使用

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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int n1 = 10;
            int n2 = 3;
            double d = n1 * 1.0 / n2;//n1乘以1.0后就已经转为了double型


            Console.WriteLine("{0:0.00}", d);//通过"{0:0.00}",使得结果只保留两位小数
            Console.ReadKey();




        }
    }
}