high ascii to low ascii

Question

5.00/5 (1 vote)

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Hi,

is there an algorithm which converts high ascii codes to low ascii codes. For example: I want to convert ù to u, û to u, ò to o, Ä to A, etc..

I just ask this because i don't feel like hard coding each special char to his equivalent.

grtz,
Wannes

Posted 23-Jul-10 4:17am

Wannes Geysen

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Comments

Richard MacCutchan 23-Jul-10 10:44am

No, there is no algorithm. If you look at the ASCII character tables you may notice that these characters occupy somewhat random locations so they do not map directly to their non-accented characters.

Toli Cuturicu 23-Jul-10 13:59pm

Yes, there is an algorithm. Just look at my answer.

4 solutions

Solution 4

I found this using google:

C#

public static string RemoveDiacritics(string s)
{
    string normalizedString = s.Normalize(NormalizationForm.FormD);
    StringBuilder stringBuilder = new StringBuilder();
    for (int i = 0; i < normalizedString.Length; i++)
    {
        char c = normalizedString[i];
        if (CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark)
            stringBuilder.Append(c);
    }
    return stringBuilder.ToString();
}

Posted 23-Jul-10 7:58am

Toli Cuturicu

Solution 2

If you need a very generic approach (without the use of framework functions etc.), take a look at the code table you're using and
get your chars' numeric value, then add/subtract the appropiate
number and finally get the char back from that result value.

In ASCII: A is 65 while a is 97. So just add/subtract 32 from the
chars numeric value and you're good to go

Posted 23-Jul-10 4:30am

michaelschmitt

v2

Comments

Wannes Geysen 23-Jul-10 10:33am

but this isn't equal for each char. ù = 151 and û = 150 and i want to convert both these chars to u = 117. In the first case, i have to substract 24 and in the second case only 23. And that is the whole clue of my question.

Sauro Viti 23-Jul-10 10:34am

Note that 32 is represented in binary format as 00100000 so you could translate to uppercase/lowercase using bitwise & and | operators... Who initially design the ASCII code did it in a clever way!

Toli Cuturicu 23-Jul-10 13:52pm

Reason for my vote of 1
absurdity

michaelschmitt 13-Aug-10 7:55am

absurdity? You disqualified yourself. It was a valid answer, even if this is too complex for you or
not the best/easiest way to do it.

Solution 1

The .NET framework already has such a method: you can use String.ToLower() and String.ToUpper().

Posted 23-Jul-10 4:22am

Sauro Viti

Comments

Wannes Geysen 23-Jul-10 10:27am

That does not work. the result still contains the complex chars instead of the low ascii chars.

Johnny J. 23-Jul-10 10:33am

Reason for my vote of 1
Misunderstanding...

Wannes Geysen 23-Jul-10 10:35am

Reason for my vote of 1
does not work

Toli Cuturicu 25-Jul-10 9:12am

Reason for my vote of 1
not true

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Sauro Viti · Accepted Answer · 2010-07-23T04:40:00

Solution 3

I see that you want to replace accented characters with the correspondant plain ones. To do it you have to treat each of them separately.

You can use String.ToLower() and String.ToUpper() and treat the accented characters separately, or you can use the Dictionary(TKey, TValue Class)[^]

Posted 23-Jul-10 4:40am

Sauro Viti

Comments

Wannes Geysen 23-Jul-10 10:45am

That is exactly what I'm afraid off. I rather don't produce a long hard coded list with special chars with their equivalent char.

Toli Cuturicu 23-Jul-10 14:00pm

Reason for my vote of 1
Not true