Empty file help

[Hedgehog Ninja]

I got my program to work but I want to add an if statement where if the file is empty to print out a message to tell the user that its empty. Here is a small part of my code.

 int main()
{
     County countyList[COUNTY_MAX];
     int index=0;
     ifstream input;
     string fname;
     //Intro
     cout << "Welcome to the Tennessee Sales Tax Report! \n";
     cout << "Enter input file name.\n";
     cin >> fname;
     //opening file of correct
     input.open(fname.c_str());
     
     if(input.fail())
     {
          cout << "Input file " << fname << " does not exist.\n";
	  exit(0);
     }
     while (input >> countyList[index].county)
     {
          input >> countyList[index].county;
          index++;
     }
     //Close input file
     input.close(); 
}

[haglerchristopher]

you should be able to accomplish this with fseek. Doing something like fseek(file, 0, SEEK_END); int size = ftell(file);

[Hedgehog Ninja]

what does this do? Int size = ftell(file);

[haglerchristopher]

http://www.cplusplus.com/reference/cstdio/ftell/. It gets the number of bytes from the beginning of the file.

it should be a long and not an int. This also has a potential of overflow. You can only get the size of files up to 2GB. This will not work for larger files. You will need to use the function fstat