C++ ifstream Get file size

#include <fstream>
#include <iostream>
using namespace std;
#include <process.h>              //for exit()
int main(int argc, char* argv[] )
{
   if( argc != 2 )
      { cerr << "\nFormat: filename\n"; exit(-1); }
   ifstream infile;               //create file for input
   infile.open( argv[1] );        //open file
   if( !infile )                  //check for errors
      { cerr << "\nCan't open " << argv[1]; exit(-1); }
   infile.seekg(0, ios::end);     //go to end of file
   // report byte number
   cout << "Size of " << argv[1] << " is " << infile.tellg();
   cout << endl;//from   w ww  . ja v  a  2  s . c  o m
   return 0;
}