using System;
using System.IO;

class MainClass {
    static void Main() {
        FileInfo file = new FileInfo("data.txt");

        Console.WriteLine(file.Attributes.ToString());

        if (file.Attributes == FileAttributes.ReadOnly) {
            Console.WriteLine("File is read-only (faulty test).");
        }

        if ((file.Attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly) {
            Console.WriteLine("File is read-only (correct test).");
        }
    }
}

           
          

   
 
using System;
public class MainClass {
    public static void Main() {
        byte[] utf8Bytes = System.Text.Encoding.UTF8.GetBytes("0123456789");
        byte[] utf16Bytes = System.Text.Encoding.Unicode.GetBytes("0123456789");
        byte[] utf32Bytes = System.Text.Encoding.UTF32.GetBytes("0123456789");

        string original1 = System.Text.Encoding.UTF8.GetString(utf8Bytes);
        string original2 = System.Text.Encoding.Unicode.GetString(utf16Bytes);
        string original3 = System.Text.Encoding.UTF32.GetString(utf32Bytes);

        Console.WriteLine(original1);
        Console.WriteLine(original2);
        Console.WriteLine(original3);
    }
}

    

   
 
using System;

public class MainClass {
    public static void Main() {
        byte[] utf8Bytes = System.Text.Encoding.UTF8.GetBytes("0123456789");
        byte[] utf16Bytes = System.Text.Encoding.Unicode.GetBytes("0123456789");
        byte[] utf32Bytes = System.Text.Encoding.UTF32.GetBytes("0123456789");

        Console.WriteLine(utf8Bytes.Length);
        Console.WriteLine(utf16Bytes.Length);
        Console.WriteLine(utf32Bytes.Length);
    }
}

    

   
 
using System;
using System.Text;

class StringEncodingApp {
    static void Main(string[] args) {
        byte[] bb = new byte[] { 0, 72, 0, 101, 0, 108, 0, 108, 0, 111 };
        string t = Encoding.BigEndianUnicode.GetString(bb);
        Console.WriteLine(t);
    }
}

    

   
 
using System;
using System.Text;

class StringEncodingApp {
    static void Main(string[] args) {
        byte[] ba = new byte[] { 72, 101, 108, 108, 111 };
        string s = Encoding.ASCII.GetString(ba);
        Console.WriteLine(s);
    }
}

    

   
 
using System;
using System.IO;
using System.Text;

class MainClass
{
    public static void Main()
    {
        using (StreamWriter output = new StreamWriter("output.txt"))
        {
            string srcString = "Area = u03A0r^2";
            output.WriteLine("Source Text : " + srcString);

            byte[] utf16String = Encoding.Unicode.GetBytes(srcString);
            output.WriteLine("UTF-16 Bytes: {0}",BitConverter.ToString(utf16String)); 

            byte[] utf8String = Encoding.UTF8.GetBytes(srcString);
            byte[] asciiString = Encoding.ASCII.GetBytes(srcString);

            output.WriteLine("UTF-8 Bytes: {0}",
            BitConverter.ToString(utf8String));
            output.WriteLine("ASCII Bytes: {0}",
            BitConverter.ToString(asciiString));

            output.WriteLine("UTF-8 Text : {0}",Encoding.UTF8.GetString(utf8String));
            output.WriteLine("ASCII Text : {0}",Encoding.ASCII.GetString(asciiString));
        }

    }
}

    

   

using System;
using System.IO;
using System.Text;

class Test
{
    public static void Main() 
    {        
        using (StreamWriter output = new StreamWriter("practice.txt")) 
        {
            // Create and write a string containing the symbol for Pi.
            string srcString = "Area = u03A0r^2";

            // Convert the UTF-16 encoded source string to UTF-8 and ASCII.
            byte[] utf8String = Encoding.UTF8.GetBytes(srcString);
            byte[] asciiString = Encoding.ASCII.GetBytes(srcString);
            
            // Write the UTF-8 and ASCII encoded byte arrays. 
            output.WriteLine("UTF-8  Bytes: {0}", BitConverter.ToString(utf8String));
            output.WriteLine("ASCII  Bytes: {0}", BitConverter.ToString(asciiString));
            
            
            // Convert UTF-8 and ASCII encoded bytes back to UTF-16 encoded  
            // string and write.
            output.WriteLine("UTF-8  Text : {0}", Encoding.UTF8.GetString(utf8String));
            output.WriteLine("ASCII  Text : {0}", Encoding.ASCII.GetString(asciiString));

            Console.WriteLine(Encoding.UTF8.GetString(utf8String));
            Console.WriteLine(Encoding.ASCII.GetString(asciiString));
        }
    }
}