count the number of characters in a string

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3.67/5 (5 votes)

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Hi!

I am a beginner in c#.
My question is, how can I count the number of characters in a string?
Example: in some text i need to find certain letter (how many times is that letter is showing up) using foreach loop.

Thx

Posted 5-Apr-11 23:15pm

blink_Lom

Updated 31-May-23 22:44pm

Rahul VB

v3

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Jonathan Cardy · Accepted Answer · 2011-04-06T00:53:00

Solution 4

Why must you use a foreach loop? Since you're a beginner, here are some much more interesting solutions to look at!

C#

string str = "abcdaab";

//Solution 1 - remove the character, and compare its length.
int result1 = str.Length - str.Replace("a", "").Length;

//Solution 2 - split the string into an array using the character as a delimiter
int result2 = str.Split('a').Length - 1;

//Solution 3 - use the LINQ 'Count' extension method
int result3 = str.ToCharArray().Count(c => c == 'a');

Posted 6-Apr-11 0:53am

Jonathan Cardy

Updated 6-Apr-11 0:54am

v2

Comments

Kim Togo 6-Apr-11 9:59am

My 5 for solution 3. Linq is a powerfull tool.

Sergey Alexandrovich Kryukov 6-Apr-11 14:59pm

This one is good, especially link. Instead of "" you should better use string.Empty.
Hard-coded (immediate) constants are bad, but for the codelet maybe acceptable.
5 anyway.
--SA

aravindkrgec · Accepted Answer · 2011-04-05T23:47:00

Solution 3

C#

int count = 0;
char charToCount = 'i';
foreach (char c in string123)
{
    if( c == charToCount )
    {
        count++;
    }
}

The above code will help you find the no. of instance of a particular character, here 'i', in the string, string123.

Posted 5-Apr-11 23:47pm

aravindkrgec

Updated 6-Apr-11 10:25am

v3

Comments

JOAT-MON 6-Apr-11 5:54am

wrapped code block

Mahendra.p25 · Accepted Answer · 2011-04-05T23:19:00

try this

C#

string abc="1234567777";
           int  k = abc.Length;

C#

string abc = "adkjddaadtyy";
            int Count=0;
            foreach (char c in abc)
            {
                if (c == 'd')
                {
                    Count++;
                }
            }
            int k = Count;

CPallini · Accepted Answer · 2011-04-05T23:30:00

Solution 2

If you're already using a foreach loop then you don't need, a priori, such a info.
e.g.:

C#

String s = "foo abc";
int count = 0;
foreach (char c in s)
{
  count++;
}

Posted 5-Apr-11 23:30pm

CPallini

Updated 5-Apr-11 23:31pm

v2

Comments

JOAT-MON 6-Apr-11 5:37am

I think OP is looking for frequency of a specific letter in the foreach, not just full count.

Syed Nasser Ahmed 19-Oct-19 10:03am

static void CountLetters()
{
string str = "ThisIsAWord";
char[] strChars = str.ToArray();
int[] cntr = new int[str.Length];
int i = 0;
string retString = string.Empty;

foreach (char c in str)
{
cntr[i] = countChars(c, str);
i++;
}

i = 0;

foreach (int j in cntr)
{
retString += strChars[i] + " Occurs " + j + " times" + "\n";
i++;
}

Console.WriteLine(retString);
Console.Read();
}

static int countChars(char c, string str)
{
int cntr = 0;

foreach (char cNew in str)
{
if (c == cNew) cntr++;
}

return cntr;
}

This may not be the best solution, suggestions are most welcome...