C#: Count a total number of alphabets, digits and special characters

Last update on December 20 2024 12:53:41 (UTC/GMT +8 hours)

Write a program in C# Sharp to count the number of alphabets, digits and special characters in a string.

Sample Solution:-

C# Sharp Code:

using System;

// Define the Exercise7 class
public class Exercise7  
{  
    // Main method - entry point of the program
    public static void Main() 
    {
        string str; // Declare a string variable to hold user input
        int alp, digit, splch, i, l; // Declare variables to count alphabets, digits, and special characters
        alp = digit = splch = i = 0; // Initialize count variables to zero

        // Prompt the user to input a string
        Console.Write("\n\nCount total number of alphabets, digits, and special characters:\n");
        Console.Write("--------------------------------------------------------------------\n"); 	
        Console.Write("Input the string: ");
        str = Console.ReadLine();	// Read the input string from the user
        l = str.Length; // Get the length of the input string

        // Loop through each character in the string to count alphabets, digits, and special characters
        while (i < l)
        {
            if ((str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z'))
            {
                alp++; // Increment the alphabet count if the character is an alphabet
            }
            else if (str[i] >= '0' && str[i] <= '9')
            {
                digit++; // Increment the digit count if the character is a digit
            }
            else
            {
                splch++; // Increment the special character count for all other characters
            }

            i++; // Move to the next character
        }

        // Display the counts of alphabets, digits, and special characters in the string
        Console.Write("Number of Alphabets in the string is: {0}\n", alp);
        Console.Write("Number of Digits in the string is: {0}\n", digit);
        Console.Write("Number of Special characters in the string is: {0}\n\n", splch);
    }
}

Sample Output:

Count total number of alphabets, digits and special characters :       
--------------------------------------------------------------------   
Input the string : Welcome to w3resource.com                           
Number of Alphabets in the string is : 21                              
Number of Digits in the string is : 1                                  
Number of Special characters in the string is : 3 

Flowchart:

C# Sharp Code Editor:

Click to Open Editor

Contribute your code and comments through Disqus.

Previous: Write a program in C# Sharp to compare two string without using string library functions.
Next: Write a program in C# Sharp to copy one string to another string.