count the all characters in a given string

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Hello

Given a string such as "basheer", how would I could all the given instances of the characters in the string and output it? The sample I'm after is:

b=1
a=1
s=1
h=1
e=2
r=1

Regards
Basheer

Posted 26-Apr-12 22:03pm

Basheer Belgod

Updated 26-Apr-12 22:22pm

Pete O'Hanlon

v2

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Paul E Davies 27-Apr-12 4:07am

What have you tried? Why didn't that work?

3 solutions

Solution 1

A simple way to achieve this would be to use a Dictionary<char, int> which represents the letter and the count of instances. Start at the left character and work your way towards the last character. With each character, check to see if it's already in the dictionary. If it is increment the count. If it isn't, add the character in and set the count to 1.

There are other ways to achieve this, of varying complexity, but remember that you are going to have to support this in the future, and this looks to be a homework question so don't worry about the performance too much. The important thing with homework is clarity of code, and demonstrating that you understand the principals - this is the whole reason I've just told you what the logic is that you would apply, and haven't actually given you the code; that is left to you to prove that you do understand the principals.

Posted 26-Apr-12 22:13pm

Pete O'Hanlon

Updated 26-Apr-12 22:23pm

v2

Comments

VJ Reddy 27-Apr-12 4:34am

Good guidance. 5!

slightrain 27-Apr-12 4:39am

That's very good, but for the performance, should use IDictionary replace Dictionary object.

Sergey Alexandrovich Kryukov 27-Apr-12 23:04pm

Sorry, this is wrong. It has nothing to do with performance. The run-time type of IDictionary will be Dictionary anyway, of one of other types implementing IDictionary.
--SA

Sergey Alexandrovich Kryukov 27-Apr-12 23:02pm

Good, my 5.
--SA

Solution 3

Refer to this link:
http://forums.asp.net/post/2613305.aspx[^]

Posted 26-Apr-12 22:17pm

Deepak_Sharma_

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VJ Reddy · Accepted Answer · 2012-04-26T22:16:00

Solution 2

The GroupBy extension method and Count extension methods of IEnumerable interface can be used as shown below:

C#

void Main()
{
	string str="basheer";
	List<string> charCounts = str.GroupBy (ch => ch).Select (
			item => item.Key + "=" + item.Count().ToString()).ToList();
	foreach (string  s in charCounts)
	{
		Console.WriteLine (s);		
	}
	
}
//Output
//b=1
//a=1
//s=1
//h=1
//e=2
//r=1

Posted 26-Apr-12 22:16pm

VJ Reddy

Updated 26-Apr-12 22:17pm

v2

Comments

Pete O'Hanlon 27-Apr-12 4:21am

It's good, but as it looks to be homework, it might actually be too good. That's why I suggest he users a simpler method. No offence mate, but you've just done his thinking for him, and I don't think you're going to get the mark from the tutor.

VJ Reddy 27-Apr-12 4:33am

Thank you for the comment. I did not think in the direction of homework. You're correct. I have seen your answer. It's very good guidance.

Pete O'Hanlon 27-Apr-12 4:48am

No problem, I obviously have a nastier, more suspicious mind than you;)

Sergey Alexandrovich Kryukov 27-Apr-12 23:06pm

I basically tend agree with you here, Pete, but it does not prevent me from voting 5 for VJ's solution. Isn't that fair enough?
--SA

VJ Reddy 27-Apr-12 23:18pm

Thank you very much for the consideration, SA

Pete O'Hanlon 28-Apr-12 3:06am

I had already voted 5 because it was a good solution. My comment was just to let him know that it was too good for a homework solution. The tutor is going to know that this solution was arrived at by a professional coder. If the op had been able to come up with a solution as neat as this, he wouldn't have had to ask the question in the first place.

VJ Reddy 28-Apr-12 3:09am

Thank you, Pete O'Hanlon.

Sergey Alexandrovich Kryukov 30-Apr-12 19:37pm

Right.
--SA