Reverse a file : fstream « File Stream « C++ Tutorial

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C++ Tutorial » File Stream » fstream

12.8.2.Reverse a file

#include <iostream>

#include <fstream>

#include <cstdlib>

using namespace std;



int main(int argc, char *argv[])

{



  fstream inout("test.txt", ios::in | ios::out | ios::binary);



  if(!inout) {

    cout << "Cannot open input file.\n";

    return 1;

  }



  long e, i, j;

  char c1, c2;

  e = 5;



  for(i=0, j=e; i<j; i++, j--) {

    inout.seekg(i, ios::beg);

    inout.get(c1);

    inout.seekg(j, ios::beg);

    inout.get(c2);



    inout.seekp(i, ios::beg);

    inout.put(c2);

    inout.seekp(j, ios::beg);

    inout.put(c1);

  }



  inout.close();

  return 0;

}

12.8.fstream
	12.8.1.	Open a file for output then write to that file
	12.8.2.	Reverse a file
	12.8.3.	Use fstream to read and write a file.
	12.8.4.	change a file by offset

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