Introduction
I have used Visual Studio 2012 for debugging purpose. But you can use any version of visul studio as per your availability..
using System; public class StringExercise { public static void Main() { string str; int alphabet, digit, specialchar, i, l; alphabet = digit = specialchar = i = 0; Console.Write("Enter the string : "); str = Console.ReadLine(); l = str.Length; while (i < l) { if ((str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z')) { alphabet++; } else if (str[i] >= '0' && str[i] <= '9') { digit++; } else { specialchar++; } i++; } Console.Write("Number of Alphabets in the string is : {0}\n", alphabet); 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", specialchar); Console.ReadLine(); } }