Tell the current position : file pointer « File Stream « C++ Tutorial

1. C++ Tutorial
2. File Stream
3. file pointer

#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
int main(int argc, char *argv[]){
   if(argc!=4){
      cout << "Usage: change <filename> <byte> <character>" << endl;
      exit(1);
   }
   fstream out(argv[1], ios::in | ios::out | ios::binary);
   if(!out)
   {
      cout << "Cannot open file!";
      exit(1);
   }
   out.seekp(atoi(argv[2]), ios::beg);
   out.put(*argv[3]);
   cout << "Current position is: " << out.tellp() << endl;
   out.close();
}