// FILE: payroll.cc
// WRITES EACH EMPLOYEE NAME AND GROSS SALARY TO AN
//    OUTPUT FILE AND COMPUTES TOTAL PAYROLL AMOUNT

#include <fstream.h>       // required for file streams
#include <stdlib.h>        // for definition of EXIT_FAILURE

#include "prcsemp1.cc"    // process employee

// ASSOCIATE PROGRAM IDENTIFIERS WITH EXTERNAL FILE NAMES
#define in_file "Emp_File.dat" // employee file
#define out_file "Salary.dat"  // payroll file

int main()
{
   // Functions used ...
   // PROCESS ALL EMPLOYEES AND COMPUTE TOTAL
   void process_emp
     (ifstream&,           // IN: employee data stream
      ofstream&,           // OUT: payroll data stream
      float&);             // OUT: total company payroll

   // Local data ...
   ifstream eds;           // input: employee data stream
   ofstream pds;           // output: payroll data stream
   float total_payroll;    // output: total payroll

   // Prepare files.
   eds.open (in_file);
   if (eds.fail())
   {
      cerr << "*** ERROR: Cannot open " << in_file 
           << " for input." << endl;
      return EXIT_FAILURE;
   }

   pds.open(out_file);
   if (pds.fail ())
   {
      cerr << "*** ERROR: Cannot open " << out_file 
           << " for output." << endl;
      eds.close ();
      return EXIT_FAILURE;
   }

   // Set precision and flags for floating point output.
   cout.precision (2);
   cout.setf (ios::fixed | ios::showpoint);

   // Process all employees and compute total payroll.
   process_emp (eds, pds, total_payroll);

   // Display result.
   cout << "Total payroll is $" << total_payroll << endl;

   // Close files.
   eds.close ();
   pds.close ();
   return 0;
}