C#: Highest frequency character(s) in the words of a string

C# Sharp String: Exercise-66 with Solution

Write a C# Sharp program to calculate the highest frequency of the character(s) in the words of a given string.

Sample Data:
("aaaaaa") -> "a"
("Century of the said year") -> ""
("CPP Exercises”) -> "s, e, p"

Sample Solution:

C# Sharp Code:

using System;
using System.Linq;

namespace exercises
{
    class Program
    {
        static void Main(string[] args)
        {
            // Declare and initialize a string variable 'text'
            string text = "aaaaaa";

            // Display the original string
            Console.WriteLine("Original strings: " + text);

            // Display the highest frequency character(s) in the string
            Console.WriteLine("Highest Frequency Character(s) in the said String: " + test(text));

            // Change the value of 'text'
            text = "Century of the said year";

            // Display the new original string
            Console.WriteLine("\nOriginal strings: " + text);

            // Display the highest frequency character(s) in the string
            Console.WriteLine("Highest Frequency Character(s) in the said String: " + test(text));

            // Change the value of 'text'
            text = "CPP Exercises";

            // Display the new original string
            Console.WriteLine("\nOriginal strings: " + text);

            // Display the highest frequency character(s) in the string
            Console.WriteLine("Highest Frequency Character(s) in the said String: " + test(text));
        }

        // Define a method 'test' that takes a string argument 'text' and returns a string
        public static string test(string text)
        {
            // Group the characters in reverse order by their frequency, ordered by count in descending order
            var groups = text.Reverse().GroupBy(ch => ch).OrderByDescending(el => el.Count());

            // Get the maximum occurrence of characters
            int max_occurs = groups.First().Count();

            // If the maximum occurrence is 1, return a message indicating all unique characters
            if (max_occurs == 1)
                return "All unique characters";

            // Otherwise, return the characters with the highest frequency
            return string.Join(", ", groups.TakeWhile(el => el.Count() == max_occurs).Select(el => el.Key));
        }
    }
}

Sample Output:

Original strings: aaaaaa
Highest Frequency Character(s) in the said String: a

Original strings: Century of the said year
Highest Frequency Character(s) in the said String:  

Original strings: CPP Exercises
Highest Frequency Character(s) in the said String: s, e, P

Flowchart :

C# Sharp Code Editor:

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