Practice Exercises Java - Learn to program performing exercises with Java

Practice Exercises Java

Learn to program performing exercises with Java

12 Lessons Java with the Solutions - 228 Exercises Java with the solutions
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File inverter - Practice Exercises Java

Lesson 8:

File management

Exercise 8.18:

File inverter


Create a program to "invert" a file: create a file with the same name ending in ".inv" and containing the same bytes as the original file but in reverse order (the first byte will be the last, the second will be the penultimate, and so on, until the last byte of the original file, which should appear in the first position of the resulting file).

You must deliver only the ".cs" file, which should contain a comment with your name.

Hint: To know the length of a binary file (BinaryReader), you can use "myFile.BaseStream.Length" and you can jump to a different position with "myFile.BaseStream.Seek(4, SeekOrigin.Current);"

The starting positions we can use are: SeekOrigin.Begin, SeekOrigin.Current- o SeekOrigin.End

Source Code:

public class Main
	public static void main(String[] args)
		BinaryReader inFile = new BinaryReader(File.Open("hola.txt", FileMode.Open));

		BinaryWriter outFile = new BinaryWriter(File.Open("hola.txt.inv", FileMode.Create));

		long filesize = inFile.BaseStream.getLength();

		for (long i = filesize - 1; i >= 0; i--)
			inFile.BaseStream.Seek(i, SeekOrigin.Begin);
			byte b = inFile.ReadByte();
Exercisey 8.18

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