Im trying to complie the code but it isnt compling

Im trying to compile the code but it isnt compiling, it gives error in calculation section ans also how to use same variables used in main function to be used in calculation finction and other functions:

TXT.FILE // data read from here
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Hours Pay rate empID first name last name
40.0 10.00 A1234 Jane Adams
50.0 10.00 L8765 Mary Lincoln
25.5 10.85 W7654 Martha Washington
52.0 15.75 A9876 John Adams
45.0 25.00 W1235 George Washington
40.25 55.00 L9087 Abraham Lincoln
30.0 9.75 T9876 William Tell
42.5 12.50 M7654 Missy Muffett
30.0 10.00 P8765 Peter Piper


heres my code
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#include <iostream>
#include <cstdio>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
const int SZ = 55;
void tellUser();
int readData( string [], string [], string [], double [], double []);
int bubbleSort();
int outputScr();
int regular();
int overtime();
int grossPay();
int main()
{
      string firstname[SZ], lastname[SZ];
      string empids[SZ];
      double hours[SZ];
      double rates[SZ];
      ofstream outputFile;
      bool swapmade = false;
      bool screenonly = false;
      char yesno;
      int  i, numemp, lastpos;   
      numemp = readData(firstname, lastname, empids, hours, rates);
      for (i = 0; i < numemp; i++)
      {
          cout << firstname[i] << lastname[i] << empids[i] <<  hours[i]
               << rates[i] << endl; 
      }
      bubbleSort();
      regular();
      overtime();
      grossPay();
      outputScr();
      return 0;
}  //end main
/* rellUser(0
 * tells about the program to the user
 */
void tellUser()
{
   cout <<"\nThis program reads a file called employees.txt,\n";
   cout <<"and it calculates the regular pay, overtime pay\n";
   cout <<"and grosspay and total for grosspay for each employee and\n";
   cout <<"sorts the from last name.\n";
   cout <<"output is written to the screen. \n\n"; //tell user what program does
}
/**************************************************
 * readData
 * firstname , lastname, empID, hours, rate of pay
 */
int readData(string firstn[], string lastn[], string empID[], double hrs[], double rate[])
{ 
     int numemp;
     ifstream inputFile;
     int i = 0;
     tellUser();  
     // open file and read inputs from employees.txt
     inputFile.open("employees.txt");
     if (inputFile.fail())
     {
        cout << "Error opening file employees.txt \n\n";
        cout << "end of program\n\n";
     }
     else
     {
        while ((inputFile >> hrs[i]) && (i < SZ))
        {
           inputFile >> rate[i];
           inputFile >> empID[i];
           inputFile >> firstn[i];
           inputFile >> lastn[i];
           i++;
        } //end while
        cout << "There were " << i << " employess\n\n";
        numemp = i;
        inputFile.close();
        //************* close input file ****************//
        cout << "input file closed\n\n";
    }
}
/* bubbleSort()
 * sorts employees with theor last name snd displays in 
 * screen and txt file
 */
int bubbleSort()
{
       string firstn[SZ], lastn[SZ];
       string empID[SZ];
       double hrs[SZ];
       double rate[SZ];
       int  i, numemp, lastpos;
       bool screenonly = false;
       ofstream outputFile;
       bool swapmade = false;
       cout << "sorting golfer\n";
       lastpos = numemp;
       do
       {
         lastpos--;
         swapmade = false;
         for ( i = 0; i < lastpos; i++)
         {
            swap(firstn[i], firstn[i+1]);
            swap(lastn[i], lastn[i+1]);
            swap(empID[i], empID[i+1]);
            swap(hrs[i], hrs[i+1]);
            swap(rate[i], rate[i+1]);
            swapmade - true;
         }
       } while(swapmade);
}
/* regular()
 * calculates employees regular pay
 */
int regular()
{
   double hours[i];
   double rate;
   if(hours <= 40)
      grossPay = hours * rate;
}
/* overtime()
 * calculates employees overtime pay
 */
int  overtime()
{
  double hours, rate;
 // const int emp_hrs = 40;
 // const double emp_over = 1.5;
  if (hours >= 40) 
     overtime = (hours - 40) * rate * 1.5;
}
/* grossPay()
 * calculates employees regular + overtime pay
 */
int  grossPay()
{
  double  hours, rate; 
  if (hours <= 40)
     grossPay = (hours * rate);
  else
     grossPay = ((hours - 40) * rate * 1.5);
}
/* outputScr()
 * displays the employee payroll function to the screen and txt file
 */
int outputScr()
{  
      string firstn[SZ], lastn[SZ];
      string empID[SZ];
      double hrs[SZ];
      double rate[SZ];
      int  i, numemp, lastpos;
      bool screenonly = false;
      ofstream outputFile; 
      cout << "Payroll being written to file payroll.txt\n"; //output function
      outputFile.open("payroll.txt"); // output file
      if (outputFile.fail())
      {
           screenonly = true;
           cout <<" output file did not open\n";
           cout <<" output file will only be sent to the screen\n";
      }
      cout <<"First   Last   Employee   Hours    Rate   Regular  Overtime   Gross\n";
      cout <<"Name    Name   Number     Worked  of Pay    Pay     Pay        Pay\n";
      cout <<"===================================================================\n";
                
      for ( i=0; i < numemp; i++)
      {
          cout<< setw(7) <<  firstn[i] << setw(13) << lastn[i];
          cout<< setw(12) << empID[i] << " " << setw(10) << hrs[i] << " ";
          cout<< setw(11) << rate[i] << " " << setw(11) << regular <<  " ";
          cout<< setw(11) << overtime << " " << setw(11) << grossPay << " \n";
          if (!screenonly)
          {
              outputFile << setw(7) << left << firstn[i] << " ";
              outputFile << setw(7) << left << lastn[i] << " ";
              outputFile << setw(4) << fixed << right << empID << " "; 
              outputFile << setw(4) << fixed << right << hrs[i] << " ";
              outputFile << setw(4) << fixed << right << rate[i] << " \n";
          }
      }
      if (!screenonly)
      { 
         outputFile.close(); cout << "Output file closed\n\n";}
} 
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