Arraylist Duplicate A Text File - C# Programming Exercise

In this exercise, you need to create a program that reads from a text file and stores it to another text file by reversing the order of the lines. This exercise will allow you to practice text file manipulation in C# and work with efficient data reading and writing. For this exercise, you will be provided with an input text file with the following format:
yesterday Real Madrid
won against
Barcelona FC

After processing the file, you will need to create an output file with the same content but with the lines in reverse order, so the output file will have the following format:
Barcelona FC
won against
yesterday Real Madrid

This exercise is useful for understanding how to read and write files in C#, as well as how to work with basic string and file manipulation operations in the system.

Exercise

Arraylist Duplicate A Text File

Objective

Create a program that reads from a text file and stores it to another text file by reversing the order of lines.

For example, an input text file like:

yesterday Real Madrid
won against
Barcelona FC

will be stored in an output text file like:

Barcelona FC
won against
yesterday Real Madrid

Write Your C# Exercise

C# Exercise Example

Example Code Copied

// Importing necessary namespaces for file I/O and ArrayList
using System; // For basic functionalities like Console
using System.Collections; // For using the ArrayList class
using System.IO; // For file input and output

class Program
{
    static void Main(string[] args)
    {
        // File paths for input and output text files
        string inputFile = "input.txt";  // Path to the input file
        string outputFile = "output.txt"; // Path to the output file

        // Check if the input file exists before proceeding
        if (File.Exists(inputFile))
        {
            // Create an ArrayList to store the lines from the input file
            ArrayList lines = new ArrayList();

            // Reading all lines from the input file and adding them to the ArrayList
            string[] fileLines = File.ReadAllLines(inputFile);
            foreach (string line in fileLines)
            {
                lines.Add(line); // Adding each line to the ArrayList
            }

            // Reversing the order of lines in the ArrayList
            lines.Reverse();

            // Writing the reversed lines to the output file
            File.WriteAllLines(outputFile, (string[])lines.ToArray(typeof(string)));

            Console.WriteLine("The lines have been reversed and written to the output file.");
        }
        else
        {
            // If the input file does not exist, display an error message
            Console.WriteLine("Input file does not exist.");
        }
    }
}

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// Importing necessary namespaces for file I/O and ArrayList
using System; // For basic functionalities like Console
using System.Collections; // For using the ArrayList class
using System.IO; // For file input and output

class Program
{
    static void Main(string[] args)
    {
        // File paths for input and output text files
        string inputFile = "input.txt";  // Path to the input file
        string outputFile = "output.txt"; // Path to the output file

// Check if the input file exists before proceeding
        if (File.Exists(inputFile))
        {
            // Create an ArrayList to store the lines from the input file
            ArrayList lines = new ArrayList();

// Reading all lines from the input file and adding them to the ArrayList
            string[] fileLines = File.ReadAllLines(inputFile);
            foreach (string line in fileLines)
            {
                lines.Add(line); // Adding each line to the ArrayList
            }

// Reversing the order of lines in the ArrayList
            lines.Reverse();

// Writing the reversed lines to the output file
            File.WriteAllLines(outputFile, (string[])lines.ToArray(typeof(string)));

Console.WriteLine("The lines have been reversed and written to the output file.");
        }
        else
        {
            // If the input file does not exist, display an error message
            Console.WriteLine("Input file does not exist.");
        }
    }
}

Arraylist Duplicate A Text File - C# Programming Exercise

Category

Dynamic Memory Management

Exercise