C# how to count number of letters which I wrote with this string

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I have a static class MyExtension,which has CountOf static function,this function must return number of that letters,which i wrote in string.In Main i must write like this`

string str = "hello";
     int r = str.CountOf('l');
     Console.WriteLine(r);

It will print 2, because there are two 'l' letter in string.

What I have tried:

i have tried like this`

static public int CountOf(this string str,char ch)
        {

            return str.Count();
        }

but i know it's false,because it's return number of string

Posted 7-Feb-18 22:49pm

Suren97

Updated 7-Feb-18 23:13pm

v2

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3 solutions

Solution 1

There are a lot of ways to do this, but the simplest is just to brute force it.
But ... this is your homework, so I'll give you no code!

1) Create a local interegr variable called count and set it to zero.
2) Use a foreach loop on the string to access each character
2.1) Inside the loop, check if the current character matches the "search for" character
2.1.1) If it matches, increment count
3) After the loop, return count

Posted 7-Feb-18 23:11pm

OriginalGriff

Comments

Suren97 8-Feb-18 6:21am

Thank you very much :)

OriginalGriff 8-Feb-18 6:24am

You're welcome!

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Maciej Los · Accepted Answer · 2018-02-07T23:11:00

Solution 2

You have to go through the collection of chars, compare them to input and return the count of searched letter in a string.

C#

string str = "hello";
char input = 'l';
int counter = 0;
//method 1
foreach(char a in str)
{
	if(a==input) counter++; 
}
//counter = 2

//method 2 - linq
var result = str.Count(x=>x==input);
//result = 2

Posted 7-Feb-18 23:11pm

Maciej Los

Updated 7-Feb-18 23:16pm

v2

Comments

Karthik_Mahalingam 8-Feb-18 5:59am

5

Maciej Los 8-Feb-18 6:22am

Thank you, Karthik

Suren97 8-Feb-18 6:22am

Thank you very much :)

Maciej Los 8-Feb-18 6:22am

You're very welcome.
Please accpet my solution (green button) if it was helpful (to mark your question as answered).

Suren97 8-Feb-18 6:27am

i alredy accepted :)

Maciej Los 8-Feb-18 6:29am

Thank you ;)

RickZeeland · Accepted Answer · 2018-02-07T23:13:00

Solution 3

You could use LINQ count, see answers here: count the number of characters in a string[^]

Posted 7-Feb-18 23:13pm

RickZeeland

Comments

Suren97 8-Feb-18 6:22am

Thank you very much :)