Inverted file

Create a program in C# that inverts all the bytes of a binary file. You can use the FileStream object to read and write binary files.

You must create a new file with the same name but with the extension .inv.

Input

Output

Solution

using System.IO;
class InvertedFile
{
    public static void Main(string[] args)
    {
        string inputFileName = "app.exe";
        string outputFileName = "app.inv";

        using (FileStream file = File.OpenRead(inputFileName))
        {
            long size = file.Length;
            byte[] data = new byte[size];

            file.Read(data, 0, (int)size);

            using (FileStream outFile = File.Create(outputFileName))
            {
                for (long i = size - 1; i >= 0; i--)
                {
                    outFile.WriteByte(data[i]);
                }
            }
        }
    }
}