C#实现计算两个特征词相似度

using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Data;
using System.Globalization;
using System.Web;
using System.Net;
using System.IO;
using System.Threading;


namespace baiduEncodeTest
{
    class Program
    {
        static void Main(string[] args)
        {            
            Console.WriteLine("请输入两个关键词");
            string key1 =Console.ReadLine ();
            string key2 = Console.ReadLine();
            string key1key2 = key1 + key2;
            string key1Num, key2Num, key1key2Num;
            key1Num = getNumFromBaidu(key1);
            key2Num = getNumFromBaidu(key2);
            key1key2Num = getNumFromBaidu(key1key2);
            double key1Int = double.Parse(key1Num);
            double key2Int = double.Parse(key2Num);
            double key1key2Int = double.Parse(key1key2Num);
            double sim = 2 * key1key2Int / ((key1Int + key2Int - (2 * key1key2Int)));