IsDigit, IsLetter, IsWhiteSpace, IsLetterOrDigit, IsPunctuation

   
   

using System;
using System.Collections.Generic;
using System.Text;

class Program {
    static void Main(string[] args) {
        Console.WriteLine("-> char.IsDigit('K'): {0}", char.IsDigit('K'));
        Console.WriteLine("-> char.IsDigit('9'): {0}", char.IsDigit('9'));
        Console.WriteLine("-> char.IsLetter('10', 1): {0}", char.IsLetter("10", 1));
        Console.WriteLine("-> char.IsLetter('p'): {0}", char.IsLetter('p'));
        Console.WriteLine("-> char.IsWhiteSpace('Hello There', 5): {0}",char.IsWhiteSpace("Hello There", 5));
        Console.WriteLine("-> char.IsWhiteSpace('Hello There', 6): {0}",char.IsWhiteSpace("Hello There", 6));
        Console.WriteLine("-> char.IsLetterOrDigit('?'): {0}",char.IsLetterOrDigit('?'));
        Console.WriteLine("-> char.IsPunctuation('!'): {0}",char.IsPunctuation('!'));
        Console.WriteLine("-> char.IsPunctuation('>'): {0}",char.IsPunctuation('>'));
        Console.WriteLine("-> char.IsPunctuation(','): {0}",char.IsPunctuation(','));
    }
}