FileSize.cpp

#include <iostream>
#include <sys/stat.h>

int main (int /*argc*/, char* argv[])
{
  struct stat fileInfo;
  if (stat (argv[1], &fileInfo) == 0) {
     std::cout << "The file's size is: " << fileInfo.st_size <<
       " bytes" << std::endl;
  } else {
    std::cout << "Unable to stat file (maybe it doesn't exist?)" <<
      std::endl;
  }
}