<div dir="ltr" text-align="left">How to calculate file size in c++</div>

The solution is not portable, it works only with Visual Studio c++.

#include <sys\types.h>
#include <sys\stat.h>
__int64 FileSize64( const char * szFileName ) 
{ 
  struct __stat64 fileStat; 
  int err = _stat64( szFileName, &fileStat ); 
  if (0 != err) return 0; 
  return fileStat.st_size; 
}

The advantage of using this function here is that there is no need to open a file prior to calculating it's size. But it rather seems unlikely :)