Open file for i/o

[holtaf]

Hi guys! I have a problem writing code that must read and write into the same file. I don't know what I'm doing wrong. This is the sample code

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

int main() {
  fstream file( "file", ios::binary | ios::app | ios::in );
  file.put('a');
  file.close();

  return 0;
}

It must write 'a' character to the file but it isn't doing anything!
Any help will be greatly appreciated!!

-holtaf

[LB]

Change ios::in to ios::out and (optionally) use an ofstream if you will only be doing output operations.

[holtaf]

Thanks for the answer but I want to use the fie for reading and writing.And it seems I solved the problem .I changed the ios::app to ios::out