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C#判断单词个数方法总结

2020-01-24 00:19:38
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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(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]);  }  }

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