C++ :: Adding Employee Names In Function Arranged Program

The program that I have written below is working. It calculates a number of payroll type variables and most recently the net pay average (All this is working 100%).

My problem is that I need to add first and last employee names to the program but every time I do this I end up ruining the working program. I've successfully added first and last names to similar programs in the past(ones that make use of an array and while loop) but never to a program that uses functions (I always have problems doing this).

My question is what codes do I use to add a first and last name variable and where do I put those codes within my program so it runs/displays correctly.

I think the coding must be similar to what I've used in the past charr and of course firstname[i] and lastname[i] lines.

Current Input File:
16454025.00
89324020.00
71044012.50
28164026.00
53874021.00
67804013.50
56414011.25

90006025.00
90015020.00
90025523.00

Ideal input file (would include names) Example.
1645 Bob Smith 40 25.00

Syntax:

#include <iostream>
#include <iomanip>
#include<fstream>
using namespace std;
//function prototypes
int readalldata(long int[], int[], float[], const int);
void findovertimehours(int[], int[], int);

[Code] .....