using System;
using System.Collections.Generic;
 
namespace ProgrammingLanguagesDictionary
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create a dictionary of programming languages and their descriptions
            Dictionary<string, string> languageDict = new Dictionary<string, string>();
 
            // Add programming languages with descriptions
            languageDict.Add("Python", "High-level, interpreted language great for data science and web development");
            languageDict.Add("JavaScript", "Essential language for web development, runs in browsers and servers");
            languageDict.Add("Java", "Object-oriented language known for 'write once, run anywhere' philosophy");
            languageDict.Add("C#", "Microsoft's object-oriented language for .NET framework development");
            languageDict.Add("C++", "Powerful system programming language, extension of C language");
            languageDict.Add("Ruby", "Dynamic, object-oriented language focused on simplicity and productivity");
            languageDict.Add("Go", "Google's language designed for modern distributed systems");
 
            Console.WriteLine("Programming Languages Dictionary:");
            Console.WriteLine("=================================");
 
            // Check if specific keys exist
            Console.WriteLine("\nChecking if languages exist in dictionary:");
            Console.WriteLine("Contains Python: " + languageDict.ContainsKey("Python"));
            Console.WriteLine("Contains PHP: " + languageDict.ContainsKey("PHP"));
 
            // Display all programming languages and their descriptions
            Console.WriteLine("\nComplete Programming Languages Dictionary:");
            foreach (KeyValuePair<string, string> pair in languageDict)
            {
                Console.WriteLine("Language: " + pair.Key.PadRight(12) + " Description: " + pair.Value);
            }
 
            // Display just the keys (language names)
            Console.WriteLine("\nJust the programming language names:");
            Dictionary<string, string>.KeyCollection keys = languageDict.Keys;
            foreach (string key in keys)
            {
                Console.WriteLine("Language: " + key);
            }
 
            // Display just the values (descriptions)
            Console.WriteLine("\nJust the descriptions:");
            Dictionary<string, string>.ValueCollection values = languageDict.Values;
            foreach (string value in values)
            {
                Console.WriteLine("Description: " + value);
            }
 
            Console.WriteLine("\nTotal number of programming languages in dictionary: " + languageDict.Count);
        }
    }
}

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