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Count how many times a character is found in a string

Counts the number of times a character appears in a string.

Submitted By: aj32

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Views: 2,668

Language: C#

Last Modified: May 22, 2008

Instructions: - Place the function in a class
- See example usage

Snippet

/// <summary>
/// Counts the number of times a character appears in a string.
/// </summary>
private string countchars(string str)
{
string[,] alphanumerics = { { "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "a", "b", "c", "d", "e", "f", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" } };
string result = "";
int FI = 0;
int LI = 0;
int counts = 0;
for (int i = 0; i < 35; i++)
{
//Get the lower-case characters first//
FI = str.IndexOf(alphanumerics[0, i]);
while (FI > -1)
{
counts++;
LI = FI + 1;
FI = str.IndexOf(alphanumerics[0, i], LI);
}
if (counts > 0)
{
result += "There are " + counts + " " + alphanumerics[0, i] + "'s.\n";
}
//Count upper-case characters//
FI = str.IndexOf(alphanumerics[0, i].ToUpper());
while (FI > -1)
{
counts++;
LI = FI + 1;
FI = str.IndexOf(alphanumerics[0, i].ToUpper(), LI);
}
if (counts > 0)
{
result += "There are " + counts + " " + alphanumerics[0, i].ToUpper() + "'s.\n";
}
counts = 0;
}
return result;
}
//Example usage:
//(After creating a textbox, named textBox1):
MessageBox.Show(countchars(textBox1.Text));

Copy & Paste

/// <summary>
/// Counts the number of times a character appears in a string.
/// </summary>
private string countchars(string str)
        {
            string[,] alphanumerics = { { "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "a", "b", "c", "d", "e", "f", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" } };
            
            string result = "";

int FI = 0;
            int LI = 0;
            int counts = 0;

for (int i = 0; i < 35; i++)
            {

//Get the lower-case characters first//

FI = str.IndexOf(alphanumerics[0, i]);
                while (FI > -1)
                {
                    counts++;
                    LI = FI + 1;

FI = str.IndexOf(alphanumerics[0, i], LI);
                }

if (counts > 0)
                {
                    result += "There are " + counts + " " + alphanumerics[0, i] + "'s.\n";
                }

//Count upper-case characters//

FI = str.IndexOf(alphanumerics[0, i].ToUpper());
                while (FI > -1)
                {
                    counts++;
                    LI = FI + 1;

FI = str.IndexOf(alphanumerics[0, i].ToUpper(), LI);
                }

if (counts > 0)
                {
                    result += "There are " + counts + " " + alphanumerics[0, i].ToUpper() + "'s.\n";
                }

counts = 0;
            }

return result;

}

//Example usage:
//(After creating a textbox, named textBox1):
MessageBox.Show(countchars(textBox1.Text));