How can I add a character to a string based on another string in C#?

Question

I need to create a function that receives two strings, representing the word to be completed and the reference word, as well as a character corresponding to the proposed letter, and returns a string corresponding to the word to be completed in which all occurrences of the proposed letter have been added, relative to the reference word.

Example: CompleterMot (".. IM ..", "ANIMAL", 'A') should return "A.IMA.". I don't understand how I can add all occurrences of the letter in the word that will be completed.

static string CompleterMot(string motincomplet, string motoriginal, char lettrepropos)
{
    string output = " ";

    for (int i = 0; i < motoriginal.Length; i++)
    {
        if((motoriginal[i] == lettrepropos))
        {
            output = motincomplet;
            if(output[i] != lettrepropos)
                output += (char)(lettrepropos);
        }
    }

    return output;
}

In final I had ..IM..A and I don't know how to fix my code.

For non french speakers : CompleterMot is CompletWord, motincomplet is IncompleteWord, motoriginal is OriginalWord and lettrepropos is SuggestedLetter — Cid
– Cid, Commented Aug 18, 2019 at 7:18

Cid · Accepted Answer · 2019-08-17 21:52:35Z

2

In your loop, you are doing this : output = motincomplet; this override the previous result. Then you append the expected letter to the output that gives "..IM.." + 'A' as result.

You can use a StringBuilder for string manipulation, that's pretty nice and allow you to directly change a character at a given index :

static string CompleterMot(string motincomplet, string motoriginal, char lettrepropos)
{
    var sb = new System.Text.StringBuilder(motincomplet);

    for (int i = 0; i < motoriginal.Length; i++)
    {
        if (motoriginal[i] == lettrepropos)
        {
            sb[i] = lettrepropos;
        }
    }
    return sb.ToString();
}

answered Aug 17, 2019 at 21:52

Cid

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