C#: Create and read the last line of a file

Last update on December 20 2024 12:49:36 (UTC/GMT +8 hours)

Write a program in C# Sharp to create and read the last line of a file.

Sample Solution:-

C# Sharp Code:

using System; // Importing the System namespace for basic functionalities
using System.IO; // Importing the System.IO namespace for file operations

class filexercise12 // Declaring a class named filexercise12
{
    static void Main() // Declaring the Main method
    {
        string fileName = @"mytest.txt"; // Initializing a string variable with the file name
        string[] ArrLines; // Declaring an array to store lines of text
        int n, i; // Declaring variables for iteration and line count

        // Displaying a message to create and read the last line of a file
        Console.Write("\n\n Create and read the last line of a file  :\n");
        Console.Write("-----------------------------------------------\n");

        if (File.Exists(fileName)) // Checking if the file exists and deleting it if true
        {
            File.Delete(fileName); // Deleting the file if it exists
        }

        Console.Write(" Input number of lines to write in the file  :");
        n = Convert.ToInt32(Console.ReadLine()); // Reading user input for the number of lines
        ArrLines = new string[n]; // Initializing the array to store lines

        Console.Write(" Input {0} strings below :\n", n); // Prompting user to input lines
        for (i = 0; i < n; i++)
        {
            Console.Write(" Input line {0} : ", i + 1);
            ArrLines[i] = Console.ReadLine(); // Reading lines of text from user input
        }

        // Writing all lines to the file
        System.IO.File.WriteAllLines(fileName, ArrLines);

        // Displaying the content of the last line of the file
        Console.Write("\n The content of the last line of the file {0} is  :\n", fileName);
        if (File.Exists(fileName)) // Checking if the file exists
        {
            string[] lines = File.ReadAllLines(fileName); // Reading all lines from the file
            Console.WriteLine(" {0}", lines[n - 1]); // Writing the last line of the file to the console
        }
        Console.WriteLine();
    }
}

Sample Output:

 Create and read the last line of a file  :                                                                   
-----------------------------------------------                                                               
 Input number of lines to write in the file  :2                                                               
 Input 2 strings below :                                                                                      
 Input line 1 : this is 1st line                                                                              
 Input line 2 : this is 2nd line                                                                              
   
 The content of the last line of the file mytest.txt is  :                                                    
 this is 2nd line

Flowchart :

C# Sharp Code Editor:

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