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

int main () {
  streampos begin,end;
  string filename;
  cout << "Enter filename: ";
  cin >> filename;
  ifstream file(filename.c_str());
  if (!file.is_open()) {
    cout << "Unable to open " << filename;
    return -1;    
  }
  begin = file.tellg();
  file.seekg (0, ios::end);
  end = file.tellg();
  file.close();
  cout << "file size is: " << (end-begin) << " bytes.\n";
}