C#判断单词个数方法总结

编辑: admin 分类: c#语言 发布时间: 2022-03-12 来源:互联网

方法一:

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();
    }
  }
}

方法二:

C#统计英文字符串中单词个数思路如下:

1.使用的Hashtable(高效)集合,记录每个单词出现的次数

2.采用ArrayList对Hashtable中的Keys按字母序排列

3.排序使用插入排序(稳定)

public void StatisticsWords(string path) {
  if (!File.Exists(path))
  {
  Console.WriteLine("文件不存在!");
  return;
  }
  Hashtable ht = new Hashtable(StringComparer.OrdinalIgnoreCase);
  StreamReader sr = new StreamReader(path, System.Text.Encoding.UTF8);
  string line = sr.ReadLine();
  string[] wordArr = null;
  int num = 0;
  while (line.Length > 0)
  {
  //  MatchCollection mc = Regex.Matches(line, @"\b[a-z]+", RegexOptions.Compiled | RegexOptions.IgnoreCase);
  //foreach (Match m in mc)
  //{
  //  if (ht.ContainsKey(m.Value))
  //  {
  //    num = Convert.ToInt32(ht[m.Value]) + 1;
  //    ht[m.Value] = num;
  //  }
  //  else
  //  {
  //    ht.Add(m.Value, 1);
  //  }
  //}
  //line = sr.ReadLine();
  wordArr = line.Split(' ');
  foreach (string s in wordArr)
  {
  if (s.Length == 0)
  continue;
  //去除标点
  line = Regex.Replace(line, @"[\p{P}*]", "", RegexOptions.Compiled);
  //将单词加入哈希表
  if (ht.ContainsKey(s))
  {
  num = Convert.ToInt32(ht[s]) + 1;
  ht[s] = num;
  }
  else
  {
  ht.Add【来源:http://www.nextecloud.cn/hk.html 转载请保留连接】(s, 1);
  }
  }
  line = sr.ReadLine();
  }
ArrayList keysList = new ArrayList(ht.Keys);
  //对Hashtable中的Keys按字母序排列
  keysList.Sort();
  //按次数进行插入排序【稳定排序】,所以相同次数的单词依旧是字母序
  string tmp = String.Empty;
  int valueTmp = 0;
  for (int i = 1; i < keysList.Count; i++)
  {
  tmp = keysList[i].ToString();
  valueTmp = (int)ht[keysList[i]];//次数
  int j = i;
  while (j > 0 && valueTmp > (int)ht[keysList[j - 1]])
  {
  keysList[j] = keysList[j - 1];
  j--;
  }
  keysList[j] = tmp;//j=0
  }
  //打印出来
  foreach (object item in keysList)
  {
  Console.WriteLine((string)item + ":" + (string)ht[item]);
  }
  }