判断英文单词个数：

using System;
namespace FindWord
{
    class Program
    {
        static void Main(string[] args)
        {
            string space = " ";
            string str = "hello world" + space;
            int count = 0;
            bool start = false;
            for (int i=0;i<str.Length;i++)
            {
                if (Char .IsLetter(str[i]))
                {
                    start = true;
                }
                if (!Char.IsLetter(str[i])&&start)
                {
                    count++;
                    start = false;
                }
            }
            Console.WriteLine(count);
            Console.ReadLine();
        }
    }
}

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