#include <iostream>
#include <fstream>
#include <iomanip>
#include <cstdlib>

bool getEmp(ifstream& empFile, string& lastName, string& firstName,
             double& salary, double& raise);
             
void writeEmp(ofstream& newFile, string& firstName, string&lastName, 
               double& updatedSalary);

void calcSalary(double salary, double raise, double updatedSalary);

using namespace std;

int main()
 {  
    cout << "Beginning employee salary updation.\n";            
    ifstream empFile ("Ch3_Ex8Data.txt");
    if (!empFile) {
    cerr << "The system was unable to open the file."; //error if file is in use.
    exit(100);  //if it is, terminate.
    }
    ofstream newFile ("Ch3_Ex8Output.dat")
    if (!newFile) {
    cerr << "They system was unable to open the file.";
    exit (102);
    }
    
 string firstName, lastName;
 double salary, raise, updatedSalary;
 
 while (getEmp  (empFile, lastName, firstName, salary, raise))
 {
       calcSalary (salary, raise, updatedSalary);
       writeEmp (newFile,  firstName, lastName, updatedSalary);
       } //end of while
       
 empfile.close();
 newfile.close();
 cout << "End of salary updation.\n";
return 0;

} //end of main


bool getEmp(ifstream&  empFile, string& lastName, string& firstName,
             double& salary, double& raise)
{           
            empFile >> lastName >> firstName >> salary >> raise;
            if (!empFile)
               return false;
            return true; 
} //end getEmp

void calcSalary(double salary, double raise, double updatedSalary)
{
     updatedSalary = (((raise*.01)+1)*salary)
     
     return;
} //end calcSalary

void writeEmp(ofstream& newFile, string& firstName, string&lastName, 
               double& updatedSalary)
{
               newfile << firstName;
               newfile.fill << (' ');
               newfile << lastName;
               newfile.fill (' ');
               newfile << updatedSalary;
               return;
} //end writeEmp