计数器

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

namespace Computer
{
  public  class Compute
    {
     
        public double Number1
        {
            get;
            set;
        }

        public string Operater
        {
            get;
            set;
        }

        public double Number2
        {
            get;
            set;
        }

        public Compute(double number1, string operater, double number2)
        {
            this.Number1 = number1;
            this.Operater = operater;
            this.Number2 = number2;
        }

        public double GetResult()
        {
            switch (Operater)
            {
                case "+":
                    return Number1 + Number2;

                case "-":
                    return Number1 - Number2;

                case "*":
                    return Number1 * Number2;

                case "/":
                    return Number1 / Number2;

                default: return 0;
            }
        }

    }
}

 

 

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

namespace Computer
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> list = new List<string>();

            string str = Console.ReadLine();

            int index = -1;

            for (int i = 0; i < str.Length; i++)
            {
                if (str[i]=='+'||str[i]=='-'||str[i]=='*'||str[i]=='/'||str[i]=='=')
                {
                    list.Add(str.Substring(index+1,i-index-1).Trim());
                    list.Add(str[i].ToString());
                    index = i;
                }
            }

            while (true)
            {
                if (!list.Contains("*") && !list.Contains("/"))
                {
                    break;
                }
                else
                {
                    int i = -1;
                    if (list.IndexOf("*")>-1)
                    {
                        i = list.IndexOf("*");
                    }
                    if (i!=-1)
                    {
                        if (list.IndexOf("/") > -1 && i > list.IndexOf("/"))
                        {
                            i = list.IndexOf("/");
                        }
                    }
                    else
                    {
                        if (list.IndexOf("/")>-1)
                        {
                            i = list.IndexOf("/");
                        }
                       
                    }
                    if (i != -1)
                    {
                        Compute c = new Compute(double.Parse(list[i - 1]), list[i], double.Parse(list[i + 1]));
                        list.RemoveAt(i - 1);
                        list.RemoveAt(i - 1);
                        list.RemoveAt(i - 1);

                        list.Insert(i - 1, c.GetResult().ToString());

                    }

                }
            }

            while (list.Count > 2)
            {
                Compute c = new Compute(double.Parse(list[0]), list[1], double.Parse(list[2]));
                list.RemoveAt(0);
                list.RemoveAt(0);
                list.RemoveAt(0);

                list.Insert(0,c.GetResult().ToString());

            }

            Console.WriteLine(str+list[0]);

            Console.ReadLine();
        }
    }
}