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

namespace?chapter0605
{
????class?Program
????{
????????delegate?double?processDelegate（double?param1?double?param2）;//委托
????????static?double?Multiply（double?parma1?double?parma2）
????????{
????????????return?parma1?*?parma2;
????????}
????????static?double?Divde（double?parma1?double?parma2）
????????{
????????????return?parma1?/?parma2;
????????}
????????static?void?Main（string[]?args）
????????{
????????????processDelegate?process;
????????????Console.WriteLine（“enter?2?numbers?separated?with?a?comma:“）;
????????????string?input?=?Console.ReadLine（）;
????????????int?commaPos?=?input.IndexOf（‘‘）;
????????