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string-processing-system [CALDERON] #37

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caee6b3
Main file for the program
jannysins Mar 1, 2026
0e676d7
String processing logic of the program
jannysins Mar 1, 2026
2dcb34a
Display functionality of the program
jannysins Mar 1, 2026
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14 changes: 14 additions & 0 deletions StringProcessingApp/Program.cs
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Original file line number Diff line number Diff line change
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using StringProcessingApp.Views;

namespace StringProcessingApp
{
class Program
{
static void Main(string[] args)
{
// Only creates and runs the view
StringView view = new StringView();
view.Run();
}
}
}
68 changes: 68 additions & 0 deletions StringProcessingApp/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()
{
return _currentText;
}

public void ConvertToUppercase()
{
_currentText = _currentText.ToUpper();
}

public void ConvertToLowercase()
{
_currentText = _currentText.ToLower();
}

public int CountCharacters()
{
return _currentText.Length;
}

public bool CheckIfContains(string word)
{
return _currentText.Contains(word);
}

public void ReplaceWord(string oldWord, string newWord)
{
_currentText = _currentText.Replace(oldWord, newWord);
}

public void ExtractSubstring(int startIndex, int length)
{
if (startIndex >= 0 && startIndex + length <= _currentText.Length)
{
_currentText = _currentText.Substring(startIndex, length);
}
else
{
Console.WriteLine("\n[Error] Invalid start index or length for the current text.");
}
}

public void TrimSpaces()
{
_currentText = _currentText.Trim();
}

public void ResetToOriginal()
{
_currentText = _originalText;
}
}
}
110 changes: 110 additions & 0 deletions StringProcessingApp/StringView.cs
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using System;
using StringProcessingApp.Services;

namespace StringProcessingApp.Views
{
public class StringView
{
private readonly StringService _stringService;

public StringView()
{
_stringService = new StringService();
}

public void Run()
{
bool isRunning = true;

while (isRunning)
{
Console.WriteLine("\n=============================");
Console.WriteLine(" String Processing System");
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.WriteLine("=============================");
Console.Write("Choose an option (1-11): ");

string choice = Console.ReadLine();

switch (choice)
{
case "1":
Console.Write("\nEnter new text: ");
string input = Console.ReadLine();
_stringService.SetText(input);
Console.WriteLine("Text saved successfully.");
break;
case "2":
Console.WriteLine($"\nCurrent Text: '{_stringService.GetCurrentText()}'");
break;
case "3":
_stringService.ConvertToUppercase();
Console.WriteLine("\Text converted to UPPERCASE.");
break;
case "4":
_stringService.ConvertToLowercase();
Console.WriteLine("\nText converted to lowercase.");
break;
case "5":
Console.WriteLine($"\nTotal characters: {_stringService.CountCharacters()}");
break;
case "6":
Console.Write("\nEnter word to search for: ");
string searchWord = Console.ReadLine();
bool exists = _stringService.CheckIfContains(searchWord);
Console.WriteLine(exists ? "The text CONTAINS the word." : "The text DOES NOT contain the word.");
break;
case "7":
Console.Write("\nEnter word to replace: ");
string oldWord = Console.ReadLine();
Console.Write("Enter the new word: ");
string newWord = Console.ReadLine();
_stringService.ReplaceWord(oldWord, newWord);
Console.WriteLine("\nWord replacement executed.");
break;
case "8":
try
{
Console.Write("\nEnter start index: ");
int start = int.Parse(Console.ReadLine());
Console.Write("Enter length to extract: ");
int length = int.Parse(Console.ReadLine());
_stringService.ExtractSubstring(start, length);
Console.WriteLine("Substring extraction executed.");
}
catch (FormatException)
{
Console.WriteLine("\n[Error] Please enter valid numeric values for index and length.");
}
break;
case "9":
_stringService.TrimSpaces();
Console.WriteLine("\nLeading and trailing spaces trimmed.");
break;
case "10":
_stringService.ResetToOriginal();
Console.WriteLine("\nText reset to its original state.");
break;
case "11":
isRunning = false;
Console.WriteLine("\nExiting the String Processing System. Goodbye!");
break;
default:
Console.WriteLine("\n[Error] Invalid option. Please select a number between 1 and 11.");
break;
}
}
}
}
}