Count a specific letter in a string

Question

New to c#. I want my program to count the amount that a specific letter appears in a string.

public static int countLetters(string word, string countableLetter)
{
    int count = 0;
    foreach (char c in word)
    {
        count++;
    }
    return count;
}

But you don't check your `c` is equal to `countableLetter` in your foreach statement. And `countableLetter` would be better as a `char` type in method parameter.. — Soner Gönül, Mar 03 '15 at 07:18
`int count = word.Count(ch => ch == letter)` providing that `letter` is `Char` — Dmitry Bychenko, Mar 03 '15 at 07:19

score 2 · Accepted Answer · answered Mar 03 '15 at 07:19

If you searching for exact character then change the second paramater type to char:

public static int countLetters(string word, char countableLetter)
{
    int count = 0;
    foreach (char c in word)
    {
        if(countableLetter == c)
           count++;
    }
    return count;
}

But you can do it with Count() method which included in System.Linq namespace:

return word.Count(x => x == countableLetter);

Additional:

If you want to find any char which contains in any string, then you can use:

public static int countLetters(string word, string countableLetters)
{
    int count = 0;
    foreach (char c in word)
    {
        if(countableLetters.Contains(c))
           count++;
    }
    return count;
}

or with LINQ:

return word.Count(x => countableLetters.Contains(x));

score 1 · Answer 2 · answered Mar 03 '15 at 07:19

1

You can use Enumerable.Count for that:

var count = word.Count(ch => ch == countableLetter);

Note you should change countableLetter to a char instead of a string.

answered Mar 03 '15 at 07:19

Yuval Itzchakov

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Count a specific letter in a string

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