using System;

using System.IO;

using System.Collections.Generic;

​

public interface Function

{

    DoubleWrapper eval();

    string toString();

}

​

public class DoubleWrapper : Function

{

    public const int ROUND = 9;

    private double currValue;

    public DoubleWrapper(double inValue)

    {

        currValue = Math.Round(inValue, ROUND);

    }

​

    public double getValue()

    {

        return currValue;

    }

​

    public DoubleWrapper eval()

    {

        return this;

    }

​

    public string toString()

    {

        return Convert.ToString(currValue);

    }

​

    public static DoubleWrapper operator +(DoubleWrapper in1, DoubleWrapper in2)

    {

        return new DoubleWrapper(in1.getValue() + in2.getValue());

    }

​

    public static DoubleWrapper operator -(DoubleWrapper in1, DoubleWrapper in2)

    {

        return new DoubleWrapper(in1.getValue() - in2.getValue());

    }

​

    public static DoubleWrapper operator /(DoubleWrapper in1, DoubleWrapper in2)

    {

        return new DoubleWrapper(in1.getValue() / in2.getValue());

    }

​

    public static DoubleWrapper operator *(DoubleWrapper in1, DoubleWrapper in2)

    {

        return new DoubleWrapper(in1.getValue() * in2.getValue());

    }

}

​

/*

 * Below are all the functions of the calulator (+,-,*,/)

 */

public class Div : Function

{

    private Function func1;

    private Function func2;

    public Div(Function f1, Function f2)

    {

        func1 = f1;

        func2 = f2;

    }

​

    public DoubleWrapper eval()

    {

        return func1.eval() / func2.eval();

    }

​

    public string toString()

    {

        return func1.toString() + " / " + func2.toString();

    }

}

​

public class Mult : Function

{

    private Function func1;

    private Function func2;

    public Mult(Function f1, Function f2)

    {

        func1 = f1;

        func2 = f2;

    }

​

    public DoubleWrapper eval()

    {

        return func1.eval() * func2.eval();

    }

​

    public string toString()

    {

        return func1.toString() + " * " + func2.toString();

    }

}

​

public class Sum : Function

{

    private Function func1;

    private Function func2;

    public Sum(Function f1, Function f2)

    {

        func1 = f1;

        func2 = f2;

    }

​

    public DoubleWrapper eval()

    {

        return func1.eval() + func2.eval();

    }

​

    public string toString()

    {

        return func1.toString() + " + " + func2.toString();

    }

}

​

public class Sub : Function

{

    private Function func1;

    private Function func2;

    public Sub(Function f1, Function f2)

    {

        func1 = f1;

        func2 = f2;

    }

​

    public DoubleWrapper eval()

    {

        return func1.eval() - func2.eval();

    }

​

    public string toString()

    {

        return func1.toString() + " - " + func2.toString();

    }

}

​

public class Token

{

    public static int plus = 1;

    public static int sub = 2;

    public static int mult = 3;

    public static int div = 4;

    public static int op = 1;

    public static int num = 2;

    private double val;

    private int type;

    private int kind;

    public double Val

    {

        get

        {

            return val;

        }

​

        set

        {

            val = value;

        }

    }

​

    public int Type

    {

        get

        {

            return type;

        }

​

        set

        {

            type = value;

        }

    }

​

    public int Kind

    {

        get

        {

            return kind;

        }

​

        set

        {

            kind = value;

        }

    }

    public Token()

    {

        val = 0;

        type = 0;

        kind = 0;

    }

}

​

public class Calculator

{

    public static FileStream outStream;

    public static StreamWriter outWriter;

    public static TextWriter oldOut = Console.Out;

    public static void setOutputStream(string fileName)

    {

        try

        {

            outStream = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write);

            outWriter = new StreamWriter(outStream);

        }

        catch (Exception e)

        {

            Console.WriteLine(fileName + " Could not be written");

            Console.WriteLine(e.Message);

            return;

        }

​

        Console.SetOut(outWriter);

        Console.WriteLine("Successfully changed output!");

    }

​

    public static void closeOutputStream()

    {

        Console.SetOut(oldOut);

        outWriter.Close();

        outStream.Close();

        Console.WriteLine("Output stream back to console.out");

    }

​

    public static void Main()

    {

        List<Token> tokens = getTokens();

        Console.WriteLine(tokens.Count);

    }

​

    public static List<Token> getTokens()

    {

        List<Token> tokens = new List<Token>();

        while(true)

        {

            Console.WriteLine("Enter postfix token: ");

            string val = Console.ReadLine();

            if(val == "Stop")

            {

                break;

            }

            double result;

            Token t = new Token();

            if (double.TryParse(val, out result))

            {

                t.Type = 2;

                t.Val = Convert.ToDouble(val);

            }

            else

            {

                t.Type = 1;

                switch ((val.Trim())[0])

                {

                    case '+':

                        t.Kind = 1;

                        break;

                    case '-':

                        t.Kind = 2;

                        break;

                    case '*':

                        t.Kind = 3;

                        break;

                    case '/':

                        t.Kind = 4;

                        break;

                }

            }

            tokens.Add(t);

        }

​

        return tokens;

    }

}