Programming Forums > Application Development > Visual Basic .NET

mattireland · Oct 17th, 2007, 2:44 PM

Hi,

I'm trying to count the number of letters in a string. e.g. I want to know how many e's there would be in string1 or t's there would be in string2

I was going to display them in a datagrid but abandoned that idea and now want to display them as individual integers so how many e's there are would be something like intE.

Thanks!

mattireland

andro · Oct 17th, 2007, 3:08 PM

Iterate through the string character by character and count the occurrences of each letter

Infinite Recursion · Oct 17th, 2007, 3:35 PM

http://www.freevbcode.com/ShowCode.asp?ID=1025

?

Jabo · Oct 20th, 2007, 2:41 PM

irrelevant reply and no way to delete post any longer.

Booooze · Oct 21st, 2007, 12:02 AM

This is an easy way to do it in C#. I'm sure .NET has easier built in functions though. All you'll have to do is convert it over, but for the most part it's the same.

 csharp Syntax (Toggle Plain Text) 
            string str = "Testing";
            char testchr = 't';
            int number = 0;
 
            foreach (char chr in str)
            {
                if (chr == testchr)
                {
                    number++;
                } //End if
            } //End foreach
 
            //Show number
            MessageBox.Show(number.ToString());
            string str = "Testing";
            char testchr = 't';
            int number = 0;

            foreach (char chr in str)
            {
                if (chr == testchr)
                {
                    number++;
                } //End if
            } //End foreach

            //Show number
            MessageBox.Show(number.ToString());

mattireland · Oct 27th, 2007, 7:33 AM

Thanks very much guys! Especially to IR and Booze (IR I used that link and found loads of other good stuff on there - thanks! Booze thanks for that I used it in a C# variation that I was doing). I was waiting until I had the program finished before I replied to this thread so you could see what I've done with it but alas, I've not quite finished it yet.

Thanks again,

Matt.

knetcozd · May 23rd, 2008, 5:58 AM

just out of interest what is the purpose of this program?

mbd · May 23rd, 2008, 10:37 AM

of course .net has easier built in functions:

 c# Syntax (Toggle Plain Text) 
using System;
using System.Text.RegularExpressions;
 
namespace RegExTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Regex regex = new Regex("t");
            Console.Out.WriteLine(regex.Matches("this is a test").Count);
        }
    }
}
using System;
using System.Text.RegularExpressions;

namespace RegExTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Regex regex = new Regex("t");
            Console.Out.WriteLine(regex.Matches("this is a test").Count);
        }
    }
}

sorry for the c#, but you can always use sharpdevelop to convert this to vb

mattireland · May 23rd, 2008, 1:32 PM

Thanks.

@ knetcozd: Cipher cracking.

Jimbo · May 23rd, 2008, 7:59 PM

Quote:

Originally Posted by mattireland

Cipher cracking.

Assuming you're doing this by frequency analysis, you should probably opt for a method where you have an array of 26 ints (one per letter), or something along the lines of Dictionary(Of Char, Integer) so you can get the counts for all of the letters with a single pass.

Oct 17th, 2007, 2:44 PM	#1
mattireland Hobbyist Programmer Join Date: Jul 2007 Location: Wales, United Kingdom Posts: 199 Rep Power: 2	Counting Number of Letters in a String Hi, I'm trying to count the number of letters in a string. e.g. I want to know how many e's there would be in string1 or t's there would be in string2 I was going to display them in a datagrid but abandoned that idea and now want to display them as individual integers so how many e's there are would be something like intE. Thanks! mattireland __________________ Matt Ireland http://www.mattireland.org matt@mattireland.co.uk

Oct 17th, 2007, 3:08 PM	#2
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 294 Rep Power: 3	Re: Counting Number of Letters in a String Iterate through the string character by character and count the occurrences of each letter __________________ http://www.kevinherron.com/

Oct 17th, 2007, 3:35 PM	#3
Infinite Recursion Programming Guru Join Date: Jul 2004 Location: United States Posts: 3,467 Rep Power: 8	Re: Counting Number of Letters in a String http://www.freevbcode.com/ShowCode.asp?ID=1025 ? __________________ http://jasonpowers.net "There are a thousand hacking at the branches of evil to one who is striking at the root."

Oct 20th, 2007, 2:41 PM	#4
Jabo Not a user? Join Date: Sep 2007 Posts: 254 Rep Power: 1	Re: Counting Number of Letters in a String irrelevant reply and no way to delete post any longer.

Oct 21st, 2007, 12:02 AM	#5
Booooze Expert Programmer Join Date: Mar 2006 Location: Igloo Posts: 710 Rep Power: 3	Re: Counting Number of Letters in a String This is an easy way to do it in C#. I'm sure .NET has easier built in functions though. All you'll have to do is convert it over, but for the most part it's the same. csharp Syntax (Toggle Plain Text) string str = "Testing"; char testchr = 't'; int number = 0; foreach (char chr in str) { if (chr == testchr) { number++; } //End if } //End foreach //Show number MessageBox.Show(number.ToString()); string str = "Testing"; char testchr = 't'; int number = 0; foreach (char chr in str) { if (chr == testchr) { number++; } //End if } //End foreach //Show number MessageBox.Show(number.ToString());

Oct 27th, 2007, 7:33 AM	#6
mattireland Hobbyist Programmer Join Date: Jul 2007 Location: Wales, United Kingdom Posts: 199 Rep Power: 2	Re: Counting Number of Letters in a String Thanks very much guys! Especially to IR and Booze (IR I used that link and found loads of other good stuff on there - thanks! Booze thanks for that I used it in a C# variation that I was doing). I was waiting until I had the program finished before I replied to this thread so you could see what I've done with it but alas, I've not quite finished it yet. Thanks again, Matt. __________________ Matt Ireland http://www.mattireland.org matt@mattireland.co.uk

May 23rd, 2008, 5:58 AM	#7
knetcozd Newbie Join Date: May 2008 Posts: 1 Rep Power: 0	Re: Counting Number of Letters in a String just out of interest what is the purpose of this program? Last edited by knetcozd; May 23rd, 2008 at 6:10 AM.

May 23rd, 2008, 10:37 AM	#8
mbd Programmer Join Date: Nov 2007 Posts: 86 Rep Power: 1	Re: Counting Number of Letters in a String of course .net has easier built in functions: c# Syntax (Toggle Plain Text) using System; using System.Text.RegularExpressions; namespace RegExTest { class Program { static void Main(string[] args) { Regex regex = new Regex("t"); Console.Out.WriteLine(regex.Matches("this is a test").Count); } } } using System; using System.Text.RegularExpressions; namespace RegExTest { class Program { static void Main(string[] args) { Regex regex = new Regex("t"); Console.Out.WriteLine(regex.Matches("this is a test").Count); } } } sorry for the c#, but you can always use sharpdevelop to convert this to vb

May 23rd, 2008, 1:32 PM	#9
mattireland Hobbyist Programmer Join Date: Jul 2007 Location: Wales, United Kingdom Posts: 199 Rep Power: 2	Re: Counting Number of Letters in a String Thanks. @ knetcozd: Cipher cracking. __________________ Matt Ireland http://www.mattireland.org matt@mattireland.co.uk

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Programming Forums > Application Development > Visual Basic .NET

Counting Number of Letters in a String