how to remove duplicate from a string?

sale

7y825Learn iOS Programming

Hi,

I am new to c-sharp programming and need your help.

I have written the following code to remove duplicate from the word. But don’t get the correct result.

Would you please check, what is going wrong and how the correct code look like?

for exemple if the word is "google"

the result should be gole

Thanks in advance

private void Form1_Load(object sender, EventArgs e)

{

string word = "google";

int len = word.Length;

string result = "";

for (int i = 0; i

{

for (int j = 0; j < len; j++)

{

if (!( word[i] == result[j]))

{

result = result + word[i];

MessageBox.Show("Result" + result);

}

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vincent Maverick Durano7y ago
Accepted answer
My Solution is simpler than yours. Simpler than using for-loop. I can fix your code but why you want to use for loop? Is this an assignment?
sale7y ago
thanks a lot. it works now.
have a nice day.
best regards
/sale
Vincent Maverick Durano7y ago
I already posted a for-loop solution. See my previous post above.
Vincent Maverick Durano7y ago
Here's a for-loop solution:
private void Form1_Load(object sender, EventArgs e)
{
        string word = "google";
        string result = "";

        result += word[0];
        for (int i = 1; i < word.Length; i++)
        {
                if (word[i - 1] != word[i])
                result += word[i];
        }

        MessageBox.Show("Result" + result);

}
sale7y ago
Yes, my friend.
I need to use for loop if you can correct my solution.
thanks a lot.
best regards
sale7y ago
Hi again,
thansk all of you for a quick answer.
As I wrote that I am new to programming och would like to use for-loop. yours solutions seems to mig a litte bit difficult.
I would appreciate if someone kan correct min followin code so that i can remove duplicates.
thanks

private void Form1_Load(object sender, EventArgs e)

{

string word = "google";

int len = word.Length;

string result = "";

for (int i = 0; i

{

for (int j = 0; j < len; j++)

{

if (!( word[i] == result[j]))

{

result = result + word[i];

MessageBox.Show("Result" + result);

}

}

}

}
Vincent Maverick Durano7y ago
Here's quick console app for that:
using System;
using System.Linq;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        Console.WriteLine(FilterDuplicate("Google"));
    }

    private static string FilterDuplicate(string s)
    {
        string newString = string.Empty;
        List<char> found = new List<char>();
        foreach(char c in s)
        {
            if(found.Contains(c))
            continue;

            newString+=c.ToString();
            found.Add(c);
        }
        return newString;
    }
}
That should output the word " Gogle".
Another approach, which i prefer is using LINQ:
using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        Console.WriteLine(FilterDuplicate("Google"));
    }

    private static string FilterDuplicate(string input)
    {
                return new string(input.ToCharArray().Distinct().ToArray());
    }
}
Very clean and easy to maintain.
Finally, we can enhance that by using LINQ Extension method like this:
using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        string word = "Google";
        Console.WriteLine(word.FilterDuplicate());
    }
}

public static class StringExt{
    public static string FilterDuplicate(this string input)
    {
        return new string(input.ToCharArray().Distinct().ToArray());
    }
}
Hope that helps!