using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace exam{    class Program    {        /// <summary>        /// 函数重载        /// 函数名相同，参数类型或者参数个数不同        /// </summary>        /// <param name="args"></param>        static void Main(string[] args)        {            Sayhello("Tom");            Sayhello(20);            Console.ReadKey();        }        static void Sayhello(string name)        {            Console.WriteLine("hello,{0}",name);        }        static void Sayhello(int age)        {            Console.WriteLine("u age is{0}", age);        }    }}