C++ Program of Manipulation of file pointers in File Handling

By | 05.01.2017

Manipulation of file pointers


Write a C++ Program of Manipulation of file pointers in File Handling. Here’s simple Program of Manipulation of file pointers in File Handling in C++ Programming Language.


Below is the source code for C++ Program of Manipulation of file pointers in File Handling which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/*  C++ Program of Manipulation of file pointers in File Handling  */

#include<iostream>
#include<fstream>
using namespace std;

int main()
{
   fstream fp;
   char buf[100];
   int pos;

   // open a file in write mode with 'ate' flag
   fp.open("C:\\Users\\acer\\Documents\\file4.txt", ios :: out | ios :: ate);
   cout << "\nWriting to a file ... " << endl;
   fp << "This is a one line" << endl; // write a line to a file
   fp << "This is a another line\n" << endl; // write another file

   pos = fp.tellp();
   cout << "\nCurrent position of put pointer : " << pos << endl;

   // move the pointer 10 bytes backward from current position
   fp.seekp(-10, ios :: cur);
   fp << endl << "Writing at a random location  ";

   // move the pointer 7 bytes forward from beginning of the file
   fp.seekp(7, ios :: beg);
   fp << " Hello World  ";
   fp.close(); // file write complete
   cout << "\nWriting Complete .... " << endl;

   // open a file in read mode with 'ate' flag
   fp.open("C:\\Users\\acer\\Documents\\file4.txt", ios :: in | ios :: ate);
   cout << "\nReading from the file ... \n" << endl;

   fp.seekg(0); // move the get pointer to the beginning of the file
   // read all contents till the end of file

   while (!fp.eof())
    {
      fp.getline(buf, 100);
      cout << buf << endl;
   }

   pos = fp.tellg();
   cout << "\nCurrent Position of get pointer : " << pos << endl;

   return 0;
}

OUTPUT : :


/*  C++ Program of Manipulation of file pointers in File Handling  */


Writing to a file ...

Current position of put pointer : 46

Writing Complete ....

Reading from the file ...

This is Hello World  his is a anothe
Writing at a random location

Current Position of get pointer : -1

Process returned 0

Above is the source code for C++ Program of Manipulation of file pointers in File Handling which is successfully compiled and run on Windows System.The Output of the program is shown above .

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