Read at end of file in C++ may use seekg

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Implement a program that displays the last 'n' lines of a file to console, where 'n' is input from user c++. Hints: - Don't read the whole file. - Don't use getline

What I have tried:

answer at the question by c++
file organization

Posted 29-Apr-21 1:37am

Member 15176306

Updated 29-Apr-21 1:49am

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Greg Utas · Answer 1 · 2021-04-29T01:49:00

Solution 3

C++

#include <fstream>  // defines ifstream

Documentation for what's available in ifstream, including seekg, is here[^]. That's my go-to site for looking up almost anything related to C++.

Posted 29-Apr-21 1:49am

Greg Utas

CPallini · Answer 2 · 2021-04-29T01:44:00

Solution 2

Make a rough estimate of the number of bytes you need and then read them.
After reading, process the data in order to verify you have got enough lines.
If you have indeed enough lines then print the required ones.
On the other hand, if you have not enough lines then revise your initial estimate and try again.

Posted 29-Apr-21 1:44am

CPallini

Comments

Member 15176306 29-Apr-21 8:58am

coding please

CPallini 29-Apr-21 8:59am

'Coding' is up to you.

Greg Utas 29-Apr-21 13:12pm

You need to do this yourself. This doesn't seem like a first assignment in C++, in which case you already have some experience.

Note that seekg allows you to go to the *end* of a file. From there, you should be able to back up over endlines and...

Member 15176306 · Answer 3 · 2021-04-29T01:39:00

Solution 1

#include<fstream>
using namespace std ;
int main()
{

}

Posted 29-Apr-21 1:39am

Member 15176306

Comments

Rick York 29-Apr-21 11:26am

This is your solution?