string iteration in C# to find out only constant

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how can I iterate through a string to find out each of the character which is constant(not any of these a,e,i,o,u) with out using for or foreach?

please be easy on me if this question does not make any senese.

Thanks

Posted 21-May-12 5:51am

matthewlink77

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Sergey Alexandrovich Kryukov 21-May-12 12:00pm

What do you mean by "constant"? Perhaps you mean "consonant"? :-)
http://en.wikipedia.org/wiki/Consonant

If so, in what language? Just English? What to do with non-letters, letters of different languages?
What's the problem? Just "do my home assignment for me"?
And finally, what do you mean by "be easy on me"? Nobody is going to offend you just because you don't know something, but the help should make some sense to be helpful...

--SA

VJ Reddy 22-May-12 7:56am

Thank you for accepting the solution :)

4 solutions

Solution 2

Try Linq:

C#

string s = "the quick brown fox";
char[] vowels = new char[] { 'a', 'e', 'i', 'o', 'u'};
var res = (from c in s where !(vowels.Contains(c) || c == ' ') select c).Distinct();

Posted 21-May-12 6:04am

OriginalGriff

Comments

VJ Reddy 21-May-12 12:14pm

Good answer. 5!

Sergey Alexandrovich Kryukov 21-May-12 12:20pm

How about "!"? (non letters?) vowels in different languages?
--SA

Solution 4

You can use while loop instead of for or foreach.
:)

Posted 21-May-12 6:23am

sjelen

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When answering a question please:

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VJ Reddy · Accepted Answer · 2012-05-21T06:12:00

Solution 3

Another alternative is to use Regex.Replace method as shown below

C#

string sentence = @"sentence with vowels and consonants";
sentence = Regex.Replace(sentence,@"[aeiou]","*",
    RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
Console.WriteLine (sentence);

//Output
//s*nt*nc* w*th v*w*ls *nd c*ns*n*nts

[Edit] Modified to include only consonants in the output [/Edit]

C#

string sentence = @"!sentence with vowels and consonant?";
string onlyConsonants = Regex.Replace(sentence,
     @".*?([ a-z-[aeiou]])|.*?$", "$1",
     RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
Console.WriteLine (onlyConsonants);
//output
//sntnc wth vwls nd cnsnnt

Posted 21-May-12 6:12am

VJ Reddy

Updated 21-May-12 6:53am

v3

Comments

Sergey Alexandrovich Kryukov 21-May-12 12:20pm

Same notes as for other answers, please see.
--SA

VJ Reddy 21-May-12 12:51pm

Good point. Modified solution to include only consonants
Thank you.

Sergey Alexandrovich Kryukov 28-May-12 18:30pm

5ed. Maybe this is still not perfect as it does not address consonant of other languages, but I think it's much more difficult. A number of writing systems don't even have the concept of consonants and vowels. :-)
--SA

VJ Reddy 30-May-12 7:45am

Thank you very much, SA, for reviewing the comment :)

Mohammad A Rahman · Accepted Answer · 2012-05-21T06:04:00

Solution 1

C#

static void Main(string[] args)
{
    string dataToMatch = "blah blah..AE.good night!@#$~@786%%Gillion!!!";
    string vowel = "aeiouAEIOU";
    Console.WriteLine(new string(dataToMatch.Where(item => !vowel.Contains(item) && char.IsLetter(item)).ToArray()));
}

Hope it helps :)

Posted 21-May-12 6:04am

Mohammad A Rahman

Updated 21-May-12 17:54pm

v2

Comments

VJ Reddy 21-May-12 12:13pm

Good answer. 5!

Sergey Alexandrovich Kryukov 21-May-12 12:19pm

No, it is not: it would count non-letters (such as "!") as consonants, which is wrong. Checking additionally IsLetter will also yeild wrong result is some other language is involved.
--SA

Mohammad A Rahman 21-May-12 23:54pm

Thanks for pointing that. I have updated my solution. In regards to the English, as question was asked in English and also does not mention explicitly about the language, I assumed it will just consider English as language(it is my best guess :)) to find out consonants.

VJ Reddy 21-May-12 23:59pm

Good use of LINQ.

Mohammad A Rahman 22-May-12 0:16am

Thank you VJ. I kind of addicted with lambda and big fan of curry syntax.

Sergey Alexandrovich Kryukov 28-May-12 18:38pm

Better, now 5ed. As to the other languages, the problem would look too difficult indeed. Some writing system don't have a concept of vowels or consonants; and this is very usual situation...
--SA

Mohammad A Rahman 28-May-12 18:45pm

Thank you :)