C# Sharp Exercises: Read last n number of lines from a file
C# Sharp File Handling: Exercise-14 with Solution
Write a program in C# Sharp to create and read last n number of lines of a file.
Sample Solution:-
C# Sharp Code:
using System;
using System.IO;
class filexercise14
{
static void Main()
{
string fileName = @"mytest.txt";
string[] ArrLines ;
int n,i,l,m=1;
Console.Write("\n\n Read last n number of lines from a file :\n");
Console.Write("-----------------------------------------------\n");
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.Write(" Input number of lines to write in the file :");
n= Convert.ToInt32(Console.ReadLine());
ArrLines=new string[n];
Console.Write(" Input {0} strings below :\n",n);
for(i=0;i<n;i++)
{
Console.Write(" Input line {0} : ",i+1);
ArrLines[i] = Console.ReadLine();
}
System.IO.File.WriteAllLines(fileName, ArrLines);
Console.Write("\n Input last how many numbers of lines you want to display :");
l = Convert.ToInt32(Console.ReadLine());
m=l;
if(l>=1 && l<=n)
{
Console.Write("\n The content of the last {0} lines of the file {1} is : \n",l,fileName);
if (File.Exists(fileName))
{
for(i=n-l;i<n;i++)
{
string[] lines = File.ReadAllLines(fileName);
Console.Write(" The last no {0} line is : {1} \n",m,lines[i]);
m--;
}
}
}
else
{
Console.WriteLine(" Please input the correct line no.");
}
Console.WriteLine();
}
}
Sample Output:
Read last n number of lines from a file : ----------------------------------------------- Input number of lines to write in the file :4 Input 4 strings below : Input line 1 : 1st line Input line 2 : 2nd line Input line 3 : 3rd line Input line 4 : 4th line Input last how many numbers of lines you want to display :2 The content of the last 2 lines of the file mytest.txt is : The last no 2 line is : 3rd line The last no 1 line is : 4th line
Flowchart :
C# Sharp Code Editor:
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