A simple program that will ask the user to give a string and then the program will uppercase the consonants in a given string using C# programming language.

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Program Listing

Program.cs

using System;



public class Program

{

  public static void Main()

  {

    Console.Write("\n");

    Console.Write("\tUppercase Consonants in C#");

    Console.Write("\n\n");

    Console.Write("\tEnter a string: ");

    string input = Console.ReadLine();



    Console.Write("\n\n");

    Console.Write("\tGiven String : " + input);

    Console.Write("\n\n");

    Console.Write("\tThe Result: ");

    foreach (char ch in input)

    {

      PrintChar(ch);

    }



    Console.Write("\n\n");

    Console.Write("\tEnd of Program");

    Console.Write("\n");

    Console.ReadKey();

  }

     

  public static void PrintChar(char ch)

  {

    ConsoleColor old_color = Console.ForegroundColor;



    if (ch.IsConsonant())

    {



      Console.ForegroundColor = ConsoleColor.Yellow;

      Console.Write(Char.ToUpper(ch));

      Console.ForegroundColor = old_color;

    }

    else

      Console.Write(ch);

  }

}





Characterextensions.cs

using System; public static class CharacterExtensions { public static bool IsConsonant(this char ch) { const string consonants = "BCDFGHJKLMNPQRSTVWXYZ"; return consonants.IndexOf(Char.ToUpper(ch)) != -1; } }

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