How can i get the total occurrence of letter K?

Question

I want to check on how many times does k appears. this is what i have done so far and am not getting the results.

class Program
{
    static void Main(string[] args)
    {
        int count = 0;
        string str = "hnfdjkkedjjykukyukrtrnrkkkkt";
        string l;

        for (int i = 0; i < str.Length; i++)
        {
            l = str.Substring(1, 1);
            if (l == "k")
            {
                count++;
            }
        }
        Console.WriteLine("k appears " + count++ + " times");
        Console.ReadKey();
    }
}

Change `l = str.Substring(i, 1);` and it should work – Bojan B Oct 11 '16 at 11:13 — Bojan B, Oct 11 '16 at 11:13

Arcord · Accepted Answer · 2016-10-11T11:13:31.260

3

You can try :

int count = str.Count(c => c=='k')

Hope this help :-)

edited Oct 11 '16 at 11:13

answered Oct 11 '16 at 11:12

Arcord

1,724
1
11
16

Note: to use this code you have to include `System.Linq` namespace – Paweł Hemperek Oct 11 '16 at 11:13
Indeed thanks for the add :-) – Arcord Oct 11 '16 at 11:14

Shocked · Answer 2 · 2016-10-11T11:24:08.437

You can go as simple as

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        string s = "aasfkkfasfas";
        int count = s.Count(l => l== 'k');

        Console.WriteLine(count);
    }
}

Calling Substring for each letter is really not the best solution. Keep in mind that string implements IEnumerable so you can also do it like this:

using System;

public class Program
{
    public static void Main()
    {
        string s = "aasfkkfasfas";
        int count = 0;
        foreach(char c in s)
        {
            if(c == 'k') 
                count++;
        }

        Console.WriteLine(count);
    }
}

This is closer to your original solution.

score 0 · Answer 3 · answered Oct 11 '16 at 11:18

You can also use RegEx (Regular Expressions) for that but it's kind of overkill for your use case.

It's found in the namespace System.Text.RegularExpressions (see MSDN).

Regex.Matches(text, pattern).Count

In your case, it would be

Regex.Matches("hnfdjkkedjjykukyukrtrnrkkkkt", "[k]").Count

How can i get the total occurrence of letter K?

3 Answers3