I\'m getting Linker errors when trying to run my code and can\'t find the source

Question

I'm getting Linker errors when trying to run my code and can't find the source of the errors.

Main.cpp:

#pragma once
#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
#include <cstdlib>
#include "Header.h"
using namespace std;

int main()
{

   ofstream outClientFile("employees.txt", ios::out);

  
   if (!outClientFile) // overloaded ! operator
   {
       cerr << "File could not be opened" << endl;
       exit(EXIT_FAILURE);
   }

   cout << "Enter the Employee ID, Number of hours worked and Pay rate." << endl
       << "Enter end-of-file to end input. ? ";

   int employeeid;
   float hoursworked;
   float payrate;

                  
   while (cin >> employeeid >> hoursworked >> payrate)
   {
       outClientFile << employeeid << ' ' << hoursworked << ' ' << payrate << endl;
       cout << "? ";
   }

   {

       ifstream inEmployeeFile("employees.txt", ios::in);

  
       if (!inEmployeeFile)
       {
           cerr << "File could not be opened" << endl;
           exit(EXIT_FAILURE);
       }

       int employeeid;
       float hoursworked;
       float payrate;

       cout << left << setw(10) << "Employee ID" << setw(13)
           << "Hours Worked" << "Pay Rate" << endl << fixed << showpoint;

       // display each record in file
       while (inEmployeeFile >> employeeid >> hoursworked >> payrate)
           outputLine(employeeid, hoursworked, payrate);
   }

  
   void outputLine(int employeeid, float hoursworked, float payrate);
   {
       cout << left << setw(10) << employeeid << setw(13) << hoursworked
           << setw(7) << setprecision(2) << right << payrate << endl;
   }

}

Explanation / Answer

Using below program with no errors

#pragma once
#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
#include <cstdlib>
using namespace std;
void outputLine(int employeeid, float hoursworked, float payrate)
{
cout << left << setw(10) << employeeid << setw(13) << hoursworked
<< setw(7) << setprecision(2) << right << payrate << endl;
}   
int main()
{

ofstream outClientFile("employees.txt", ios::out);
  
if (!outClientFile) // overloaded ! operator
{
cerr << "File could not be opened" << endl;
exit(EXIT_FAILURE);
}
cout << "Enter the Employee ID, Number of hours worked and Pay rate." << endl
<< "Enter end-of-file to end input. ? ";
int employeeid;
float hoursworked;
float payrate;
  
while (cin >> employeeid >> hoursworked >> payrate)
{
outClientFile << employeeid << ' ' << hoursworked << ' ' << payrate << endl;
cout << "? ";
}
{

ifstream inEmployeeFile("employees.txt", ios::in);
  
if (!inEmployeeFile)
{
cerr << "File could not be opened" << endl;
exit(EXIT_FAILURE);
}
int employeeid;
float hoursworked;
float payrate;
cout << left << setw(10) << "Employee ID" << setw(13)
<< "Hours Worked" << "Pay Rate" << endl << fixed << showpoint;
// display each record in file
while (inEmployeeFile >> employeeid >> hoursworked >> payrate)
outputLine(employeeid, hoursworked, payrate);
}
  
return 0;

}

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