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I am trying to find the number of duplicate characters in an array and list them. For example, the user enters "this is my house", the output should look like this:

Number of duplicate characters is: 3 and the duplicates are: h i s

I have to use ToCharArray()

I've been trying but I can't get it to work properly, can you please help?

Thanks

Here is my code:

using System;
class Program

 static void Main()
 
 Console.Write("type a sentence: ");
 String str = Console.ReadLine();
 char arr = str.ToCharArray();

 for (int j = 0; j < arr.Length; j++)
 
 for (int k = j + 1; k < arr.Length; k++)
 
 if (arr[j] == arr[k] && j != k)
 
 Console.WriteLine("number of duplicates: " + k + "n" + "duplicates are: " + arr[j]);
 Console.ReadLine();
 
 
 
 

You can try to use linq instead of for loop.

GroupBy make a group and use where get count greater than 1.

var r= str.Replace(" ", "").GroupBy(_ => _).Where(x => x.Count() > 1).Select(x => x.Key);

then use string.Join method and linq count instead of a loop to get your expect result.

Console.Write("type a sentence: ");
String str = Console.ReadLine();


var result = str.Replace(" ", "")
 .GroupBy(_ => _)
 .Where(x => x.Count() > 1)
 .Select(x => x.Key);


Console.WriteLine("number of duplicates: " + result.Count() + "r" + "duplicates are: " + string.Join(" ",result));

c# online

Result

type a sentence: number of duplicates: 3 duplicates are: h i s

Here is another solution without linq:

static void Main(string args)

 string longText = @"your sentence comes here";
 foreach (var character in CharacterCount.Count(longText))
 
 if(character.Value>1)
 Console.WriteLine("0 - 1", character.Key, character.Value);
 


class CharacterCount

 public static SortedDictionary<char, ulong> Count(string stringToCount)
 
 SortedDictionary<char, ulong> characterCount = new SortedDictionary<char, ulong>();

 foreach (var character in stringToCount)
 
 if (!characterCount.ContainsKey(character))
 characterCount.Add(character, 1);
 else
 characterCount[character]++;
 
 return characterCount;
 
 

This may help.

 Console.Write("type a sentence: ");
 String str = Console.ReadLine();
 char arr = str.ToCharArray();

 int count = new int[10000];

 for (int j = 0; j < arr.Length; j++)
 

 int ans=0;
 for (int j = 0; j < count.Length; j++)
 
 if(count[j]>1)
 
 ans++; 
 
 

 Console.Write("Number of duplicates: " + ans +" duplicates are: ");

 for (int j = 0; j < count.Length; j++)
 
 if(count[j]>1)
 
 Console.Write((char)j +" " );
 
 
 Console.WriteLine();
}