How do I do this with basic string functions and loop? I want to count the words in a string. My problem is that it only works when the user do not use multiple spaces.

Here is my code:

        string phrase;
        int word = 1;


        Console.Write("Enter a phrase: ");
        phrase = Console.ReadLine();

        for (int i = 0; i<phrase.Length; i  )
        {
            if (name[i] == ' ')
            {
                word  ;
            } 
        }
        Console.WriteLine(word);

CodePudding user response：

One approach is to use a regular expression to "condense" all consecutive spaces into a single instance. Then the job is simple.

var str = "aaa bb      cccc d    e";
var regex = new Regex(@"\s ");
Console.WriteLine(regex.Replace(str, " ")?.Split(' ')?.Count());

CodePudding user response：

If you can use LINQ, i suggest this approach:

    string[] source = phrase.Split(new char[] { '.', '?', '!', ' ', ';', ':', ',' }, StringSplitOptions.RemoveEmptyEntries);
    var matchQuery = from word in source
                     select word;
    
    int wordCount = matchQuery.Count();
    Console.WriteLine(wordCount);

CodePudding user response：

I would create an array with string data type. Then I would use Split method when reading the data. This would split the entire text anytime you see a defined character (character is a one letter or character). In your case the defined character would be empty space; that is ' '. So my formula would be something like:

     string phrase;
     string[] seperated;    // this is where you would split the full name
     int word = 1;


        Console.Write("Enter a phrase: ");
        phrase = Console.ReadLine();
        seperated=phrase.Split(' ');

        for (int i = 0; i<seperated.Length; i  )
        {
             Console.WriteLine(seperated[i]); // this would print each word one by one
        }

Once capture the full name split in seperated array, than you can use the seperated name, last name etc the way you want. seperated[0]= would be the first word, seperated[1] would be the second word... if the name consists of total 5 words than the last word could be reached by seperated[4].

CodePudding user response：

Instead of the for loop you could use Split() and Linq:

var splitPhrase = phrase.Split(' ');
var wordCount = splitPhrase.Count(x=>x != "");

or use StringSplitOptions, as per comment:

var words = phrase.Split(' ', StringSplitOptions.RemoveEmptyEntrie);
var wordCount = words.Count();

CodePudding user response：

You can use regex pattern: \S matches anything but a whitespace

string str = "Test words   test"    
MatchCollection collection = Regex.Matches(str, @"[\S] ");
int numberOfWords = collection.Count;

CodePudding user response：

First of all, we have to define word. If word is

Any non empty sequence of letters

we can use a simple regular expression pattern: \p{L}

Code:

using System.Text.RegularExpressions;

...

int word = Regex.Matches(phrase, @"\p{L} ").Count;

Edit: in case you don't want regular expressions you can implement FSM - Finite State Machine:

  int word = 0; 
  bool inWord = false;

  foreach (var c in phrase) 
    if (char.IsLetter(c)) {
      if (!inWord) // we count beginnings of each word
        word  = 1;

      inWord = true;
    }
    else
      inWord = false;
  

Here we have two states: - inWord == true, false - which are if character is within some word or not. Having these states we can count all the words beginnings.

CodePudding user response：

You can achieve this by using the following function.It only returns the no. of words in the given sentence.

public int totalWords(string sentence) {
            int wordCount = 0;
            for (int i = 0; i < sentence.Length - 1; i  )
            {
                if (sentence[i] == ' ' && Char.IsLetter(sentence[i   1]) && (i > 0))
                {
                    wordCount  ;
                }
            }
            wordCount  ;
            return wordCount;
        }

CodePudding user response：

Assuming your words are separated by a space you can just Split the string and get the length of the resulting array:

string[] words = phrase.Split(new char[] {' '}, StringSplitOptions.RemoveEmptyEntries);

int numberOfWords = words.Length;