infinite loop somewhere

/*

 project5.cpp

 Andre Fecteau

 CSC135-101

 December 1, 2013

 This program will take in the name of the file and then process the information inside of the file

 */

#include <iostream>

#include <string>

#include <iomanip>

#include <fstream>

#include <cstdlib>

using namespace std;

/*
 // Declarations

 // Initalizations

 // Input

 // Process

 // Output

 // Prolouge
 */
void instruct(){
    cout <<"| ------------------------------------------------------------------------- |" << endl;
    cout <<"| ------ Welcome to the employee pay and tax calculator ------------------- |" << endl;
    cout <<"| ------------------------------------------------------------------------- |" << endl;
    cout <<"This program will take the input of your filename that contains the:" << endl;
    cout <<"Employee Name, then rate, then hours worked for Mon. to Friday on seperate" << endl;
    cout <<"Lines respectively. Then do the math for the Net pay. Out this information" << endl;
    cout <<"It will then do this until there is no more data left then quit." << endl;
    cout << endl;
}
double name_hourly(ifstream &in){
    string their_name = " ";
    double hourly = 0.0;
    getline (in, their_name);
    in >> hourly;
    return 0;
}
double hours_totaled(ifstream &in){
    double monday = 0.0;
    double tuesday = 0.0;
    double wednesday = 0.0;
    double thursday = 0.0;
    double friday = 0.0;
    double total = 0.0;

    in >> monday;
    in >> tuesday;
    in >> wednesday;
    in >> thursday;
    in >> friday;
    total = monday + tuesday + wednesday + thursday + friday;

return total;
}
double doWork(double hours, double &hourly){
    double pay_amount_gross = 0.0;
    double pay_amount_net = 0.0;
    double kept_precentage = 0.0;
    double pay_kept = 0.0;

    pay_amount_gross = hours*hourly;
    if(pay_amount_gross < 500){kept_precentage = 23.7;}
    if(pay_amount_net >= 500){kept_precentage = 33.9;}
    pay_kept = kept_precentage / pay_amount_gross * 100;
    pay_amount_net = pay_amount_gross - pay_kept;
    return 0;
}
void outInfo(double &pay_amount_gross, string &their_name, double &hourly, double hours, double &pay_amount_net, double &pay_kept){
    cout <<"| ------------------------------------------------------------------------- |" << endl;
    cout <<"| ----------------------- Calculation Totals ------------------------------ |" << endl;
    cout <<"| ------------------------------------------------------------------------- |" << endl;
    cout <<" Employee Name: " << their_name << endl;
    cout <<"     Gross Pay: $" << setprecision(2)<< fixed << pay_amount_gross << endl;
    cout <<"   Amount Kept: $"<< setprecision(2)<< fixed << pay_kept << endl;
    cout <<"       Net Pay: $"<< setprecision(2)<< fixed << pay_amount_net << endl;
}
string file(double &pay_amount_gross, string &their_name, double &hourly, double hours, double &pay_amount_net, double &pay_kept){
ifstream in;
        while (true)
            {
                string infilename;
                cout << "Please Enter the name of the file to be opened: ";
                getline( cin, infilename);
                in.open( infilename.c_str() );
                if(in)break;
            }
        if(in)
            {
            while(!in.eof())
                {
                    name_hourly(in);
                    hours_totaled(in);
                    doWork(hours, hourly);
                    outInfo(pay_amount_gross, their_name, hourly, hours, pay_amount_net, pay_kept);
                }
            }
return 0;
}
int main(){
    double pay_amount_gross;
    string their_name;
    double hourly;
    double hours;
    double pay_amount_net;
    double pay_kept;

 instruct();
 file(pay_amount_gross, their_name, hourly, hours, pay_amount_net, pay_kept);
return 0;
}