Question

Write a method in C# which takes string as an argument and extracts all words of length between 4 to 5 and contains vowels in it. Method returns an array of type string containing words which satisfied above criteria. Show these words in main().

Answer 1

using System;
using System.Collections.Generic;

class MainClass {
  public static void Main (string[] args) {
    string sentence = "Welcome to array world shy fly crypt";
    List<string> extractedWords = extract(sentence);
    Console.WriteLine("[{0}]", string.Join(", ", extractedWords));
  }
  
  public static List<string> extract(string sentence){
    // splitting each word
    string[] words = sentence.Split(' ');
    // we dont know how many elements satisfy the condition so
    // we are using List Collection
    List<string> newList = new List<string>();
    for(int i=0;i<words.Length;i++){
      string word = words[i];
      // checking length
      bool lengthFlag = word.Length == 4 || word.Length == 5;
      // checking is vowel or not
      bool vowelFlag = word.Contains("a")||word.Contains("A")||
                        word.Contains("e")||word.Contains("E")||
                        word.Contains("i")||word.Contains("I")||
                        word.Contains("o")||word.Contains("O")||
                        word.Contains("u")||word.Contains("U");
      if( lengthFlag && vowelFlag ){
        newList.Add(words[i]);
      }
    }
    return newList;
  }
}

Code

Output