matching an array with another array

Question

i'm looking for an array matching method.

here i have two arrays as the code shows

char[] normalText = new char[26] {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
char[] parsedText = new char[26] {'b', 'c', 'd', 'e', 'f', 'g', ...};

and, i want to match them so, if i write "abc" in the program it will turn into "bcd" and, i've made a text parser method like this:

        parsing = input.ToCharArray();
        foreach (char c in parsing)
        {
            throw new NotImplementedException();
        }

but, i don't know what kind of query should i do to match them after the foreach statement. if you know how to match this in code, please post here, it would be VERY2 APPRECIATED

Do you want to check if they are equal or do you want to see if one is a subset of the other? — Torbjörn Kalin
– Torbjörn Kalin, Commented Apr 16, 2012 at 12:18
Why do you declare two normalText arrays, how are they related to each other? What's the rule to turn the input of "abc" into "bcd"? I'm afraid your question is currently not very clear. — Tim Schmelter
– Tim Schmelter, Commented Apr 16, 2012 at 12:18
a job for Dictionary? msdn.microsoft.com/en-us/library/xfhwa508.aspx — J...
– J..., Commented Apr 16, 2012 at 12:20
@TimSchmelter It looks like he wants to use the arrays to define a mapping by index. ie : arr1[1] = 'a' therefore return arr2[1] (= 'b') — J...
– J..., Commented Apr 16, 2012 at 12:22

Yuck · Accepted Answer · 2012-04-16 12:27:39Z

2

I'd use something like this:

var input = "abc";
var parsing = input.ToCharArray();
var result = new StringBuilder();
var offset = (int)'a';
foreach (var c in parsing) {
    var x = c - offset;
    result.Append(parsedText[x]);
}

answered Apr 16, 2012 at 12:27

Yuck

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Comments

J... · Accepted Answer · 2012-04-16 12:49:52Z

1

It looks like you want to use these to make for a 1:1 translation.

The best (ie:most extensible) way to do this is probably with a dictionary :

Dictionary<char, char> dictionary = new Dictionary<char, char>();
dictionary.Add('a', 'b');
dictionary.Add('b', 'c');
dictionary.Add('c', 'd');
//... etc (can do this programmatically, also

then :

char newValue = dictionary['a'];
Console.WriteLine(newValue.ToString()); // "b"

and so on. Using a dictionary you get all the power of lists, as well, which can be immensely handy depending on what you are doing.

edited Apr 16, 2012 at 12:49

answered Apr 16, 2012 at 12:39

J...

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Comments

Chuck Norris · Accepted Answer · 2012-04-16 12:24:10Z

0

Here is what you want. You can use Array.IndexOf(oldText, s) to get index of character in old array and then get value in new array by that index.

string input="abc";
char[] oldText = new char[26] {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
char[] newText = new char[26] { 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z','a'};

char[] array = input.ToCharArray();
StringBuilder output= new StringBuilder();
foreach(char s in array)
{
  output.Append(newText[Array.IndexOf(oldText, s)]);
}

Console.WriteLine(output.ToString()); // "bcd"

answered Apr 16, 2012 at 12:24

Chuck Norris

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Comments

Aleksandar Grgic · Accepted Answer · 2012-04-16 12:53:11Z

Something like this, now format it to a way best suited to you.

char[] normalText = new char[26] {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
char[] dictionary = new char[26] {'z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y' };    

parsing = input.ToCharArray();  
foreach (char c in parsing)
        {
           if(index(c,normalText)<= dictionary.Length) 
               Console.WriteLine(dictionary[index(c,normalText)]);
        }

int index(char lookFor, char[] lookIn) 
    {
        for (int i = 0; i < lookIn.Length; i++)
            {
                if (lookIn[i] == lookFor)
                    return i;
            }
        return -1;
    }

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