string-processing-system [RANES]

Program.cs

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+using StringProcessingApp.Views;
+
+namespace StringProcessingApp
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            StringView view = new StringView();
+            view.Run();
+        }
+    }
+}

StringService.cs

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+using System;
+
+namespace StringProcessingApp.Services
+{
+    public class StringService
+    {
+        private string _originalText = string.Empty;
+        private string _currentText = string.Empty;
+
+        public void SetText(string text)
+        {
+            _originalText = text;
+            _currentText = text;
+        }
+
+        public string GetCurrentText() => _currentText;
+
+        public void ToUpper() => _currentText = _currentText.ToUpper();
+
+        public void ToLower() => _currentText = _currentText.ToLower();
+
+        public int GetLength() => _currentText.Length;
+
+        public bool ContainsWord(string word) => _currentText.Contains(word, StringComparison.OrdinalIgnoreCase);
+
+        public void ReplaceWord(string oldWord, string newWord) => 
+            _currentText = _currentText.Replace(oldWord, newWord);
+
+        public string ExtractSubstring(int startIndex, int length)
+        {
+            if (startIndex < 0 || startIndex + length > _currentText.Length)
+                return "Error: Out of range.";
+
+            return _currentText.Substring(startIndex, length);
+        }
+
+        public void TrimSpaces() => _currentText = _currentText.Trim();
+
+        public void Reset() => _currentText = _originalText;
+    }
+}

StringView.cs

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+using System;
+using StringProcessingApp.Services;
+
+namespace StringProcessingApp.Views
+{
+    public class StringView
+    {
+        private readonly StringService _service = new StringService();
+
+        public void Run()
+        {
+            string choice = "";
+            while (choice != "11")
+            {
+                DisplayMenu();
+                choice = Console.ReadLine();
+                ProcessChoice(choice);
+                if (choice != "11") 
+                {
+                    Console.WriteLine("\nPress any key to continue...");
+                    Console.ReadKey();
+                }
+            }
+        }
+
+        private void DisplayMenu()
+        {
+            Console.Clear();
+            Console.WriteLine("=== String Processing System ===");
+            Console.WriteLine($"Current Text: \"{_service.GetCurrentText()}\"");
+            Console.WriteLine("--------------------------------");
+            Console.WriteLine("1. Enter Text");
+            Console.WriteLine("2. View Current Text");
+            Console.WriteLine("3. Convert to UPPERCASE");
+            Console.WriteLine("4. Convert to lowercase");
+            Console.WriteLine("5. Count Characters");
+            Console.WriteLine("6. Check if Contains Word");
+            Console.WriteLine("7. Replace Word");
+            Console.WriteLine("8. Extract Substring");
+            Console.WriteLine("9. Trim Spaces");
+            Console.WriteLine("10. Reset Text");
+            Console.WriteLine("11. Exit");
+            Console.Write("\nSelect an option: ");
+        }
+
+        private void ProcessChoice(string choice)
+        {
+            switch (choice)
+            {
+                case "1":
+                    Console.Write("Enter new text: ");
+                    _service.SetText(Console.ReadLine());
+                    break;
+                case "2":
+                    Console.WriteLine($"Current Text: {_service.GetCurrentText()}");
+                    break;
+                case "3":
+                    _service.ToUpper();
+                    Console.WriteLine("Converted to UPPERCASE.");
+                    break;
+                case "4":
+                    _service.ToLower();
+                    Console.WriteLine("Converted to lowercase.");
+                    break;
+                case "5":
+                    Console.WriteLine($"Length: {_service.GetLength()} characters.");
+                    break;
+                case "6":
+                    Console.Write("Enter word to find: ");
+                    string word = Console.ReadLine();
+                    bool found = _service.ContainsWord(word);
+                    Console.WriteLine(found ? "Word found!" : "Word not found.");
+                    break;
+                case "7":
+                    Console.Write("Word to replace: ");
+                    string oldW = Console.ReadLine();
+                    Console.Write("Replacement word: ");
+                    string newW = Console.ReadLine();
+                    _service.ReplaceWord(oldW, newW);
+                    break;
+                case "8":
+                    Console.Write("Start Index: ");
+                    int start = int.Parse(Console.ReadLine());
+                    Console.Write("Length: ");
+                    int len = int.Parse(Console.ReadLine());
+                    Console.WriteLine($"Result: {_service.ExtractSubstring(start, len)}");
+                    break;
+                case "9":
+                    _service.TrimSpaces();
+                    Console.WriteLine("Spaces trimmed.");
+                    break;
+                case "10":
+                    _service.Reset();
+                    Console.WriteLine("Text reset to original.");
+                    break;
+            }
+        }
+    }
+}