change a file by offset : fstream « File Stream « C++ Tutorial

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C++ Tutorial » File Stream » fstream

12.8.4.change a file by offset

#include <iostream>

#include <fstream>

#include <cstdlib>

using namespace std;



int main(int argc, char *argv[])

{



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

  if(!out) {

    cout << "Cannot open file.";

    return 1;

  }



  out.seekp(12, ios::beg);



  out.put('a');

  out.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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