Reading data from file into queue in c++ - c++

Question

I am having trouble figuring out how to get my input data into my queue... I am so close to getting this to work right.
I know I am just confused about how things are working. I have used example code and my instructions to come up with a working program that appears to be working correctly (other than not actually putting my input file data into the queue). I bypassed the function I was trying to make for this. In addition to this, I was trying to write a function to remove an employee from the queue (which I think does work), but I am not sure I was able to get it right...
I have not taken a programming class for over 10 years and really would love to get any help in understanding what I am doing and getting that darn data into the queue.
Below is my main driver file. I will provide my header file code if needed. Thanks in advance for any help you can provide on this.
//Program Assignment #3
//Creates Queue as a Linked Structure
#include<iostream>
#include<string>
#include<fstream>
#include"Employee.h"
#include"LinkedQ.h"
using namespace std;
struct Node
{
LinkedQ nodeQ;
Employee EmpNumber;
Employee LastName;
Employee FirstName;
Employee ServiceYears;
};
void loadFile(LinkedQ &);
void addEmp(LinkedQ &);
void delEmp(LinkedQ &);
int main()
{
LinkedQ empList;
int choice;
int numIn, yearsIn;
string LastName;
string FirstName;
LinkedQ empIn;
ifstream input;
input.open("Employee.txt");
while (input)
{
input >> numIn >> LastName >> FirstName >> yearsIn;
if (input)
{
cout << "this is where we load data from the file into the queue\n";
system("pause");
//empIn.Enqueue(numIn, LastName, FirstName, yearsIn);
//empList.addEmp(empIn);
}
}
input.close();
do
{
//display menu
system("cls");
cout << "\t\tMenu: \n"
<< "\t1. Add Employee\n"
<< "\t2. Remove Employee\n"
<< "\t3. Count of Employees\n"
<< "\t4. Quit\n\n";
cout << "Enter your choice and press return: ";
cin >> choice;
switch (choice)
{
case 1:
addEmp(empList); // call to function to add an employee to the queue
break;
case 2:
delEmp(empList); // call to fucntion to remove an employee from the queue
break;
case 3:
cout << endl << "Count of Employees: "
<< empList.GetLength() << endl; // See how many employees are in the queue
system("pause");
break;
case 4:
cout << "End of Program"; // End Program
break;
default:
cout << "Not a valid choice!" << endl;
cout << "Choose Again."; // Handling incorrect inputs
system("pause");
break;
}
} while (choice != 4); // If choice is not 4, continue running program
return 0;
}
//***********************************
//Loads the file (having trouble figuring out how to implement this part)
//***********************************
void loadFile(Employee &empList)
{
int numIn, yearsIn;
string LastName;
string FirstName;
LinkedQ empIn;
ifstream input;
input.open("Employee.txt");
while (input)
{
input >> numIn >> LastName >> FirstName >> yearsIn;
if (input)
{
cout << "this is where we load data from the file into the queue";
//empIn.setFields(numIn, LastName, FirstName, yearsIn);
//empList.addEmp(empIn);
}
}
input.close();
}
//***************************************
//add an employee
//***************************************
void addEmp(LinkedQ &empList)
{
Employee newEmp;
newEmp.user();
empList.Enqueue(newEmp);
}
//****************************************
//remove a employee
//****************************************
void delEmp(LinkedQ &empList)
{
Employee EmpToRemove;
int empNum;
// bool successful;
cout << "Please enter EMPLOYEE NUMBER of employee to remove:";
cin >> empNum;
EmpToRemove.setEmpNumber(empNum);
empList.Dequeue(EmpToRemove);
//successful = empList.Dequeue(EmpToRemove);
//if (successful == true)
//{
cout << "Removed" << endl << endl;
system("pause");
//}
//else
//{
// cout << "Emp Not found" << endl << endl;
//}
}
Here is the LinkedQ implementation file:
//LinkedQ class
#include "LinkedQ.h"
#include <cstddef>
#include <new>
struct NodeType
{
Employee info;
NodeType* next;
};
LinkedQ::LinkedQ(void)
{
newNode = nullptr;
front = NULL;
rear = NULL;
length = 0;
}
void LinkedQ::MakeEmpty()
{
NodeType* tempPtr;
while (front != NULL)
{
tempPtr = front;
front = front->next;
delete tempPtr;
}
rear = NULL;
}
LinkedQ::~LinkedQ(void)
{
MakeEmpty();
}
bool LinkedQ::IsFull() const
{
NodeType* location;
try
{
location = new NodeType;
delete location;
return false;
}
catch (std::bad_alloc exception)
{
return true;
}
}
bool LinkedQ::IsEmpty() const
{
return (front == NULL);
}
void LinkedQ::Enqueue(Employee newItem)
{
if (IsFull())
cout << "Queue is Full";
// throw FullQueue();
else
{
NodeType* newNode;
newNode = new NodeType;
newNode->info = newItem;
newNode->next = NULL;
if (rear == NULL)
{
front = newNode;
}
else
{
rear->next = newNode;
}
rear = newNode;
length++;
}
}
void LinkedQ::Dequeue(Employee& item)
{
if (IsEmpty())
{
//throw EmptyQueue();
cout << "Queue is empty";
}
else
{
NodeType* tempPtr;
tempPtr = front;
item = front->info;
front = front->next;
if (front == NULL)
{
rear = NULL;
}
delete tempPtr;
length--;
}
}
int LinkedQ::GetLength() const
{
return length;
}
And here is the Employee implementation file:
//employee Class
#include"Employee.h"
//Constructor
Employee::Employee()
{
EmpNum = 0;
}
//setters
void Employee::setEmpNumber(int eNum)
{
EmpNum = eNum;
}
void Employee::setEmpName(string LName)
{
LastName = LName;
}
void Employee::setEmpFirstName(string FName)
{
FirstName = FName;
}
void Employee::setYearsService(int years)
{
YearsService = years;
}
void Employee::setFields(int num, string LN, string FN, int years)
{
EmpNum = num;
LastName = LN;
FirstName = FN;
YearsService = years;
}
void Employee::user()
{
string inputString;
int intNumber;
cout << "Employee Number ";
cin >> intNumber;
while (intNumber <= 0)
{
cout << "Employee Number ";
cin >> intNumber;
}
EmpNum = intNumber;
cout << "Last Name: ";
cin >> inputString;
LastName = inputString;
cout << "First Name: ";
cin >> inputString;
FirstName = inputString;
cout << "Years of Service: ";
cin >> intNumber;
while (intNumber < 0)
{
cout << "Years of Service ";
cin >> intNumber;
}
cout << endl;
YearsService = intNumber;
}
//getters
const int Employee::getEmpNumber()
{
return EmpNum;
}
const string Employee::getLastName()
{
return LastName;
}
const string Employee::getFirstName()
{
return FirstName;
}
const int Employee::getYearsService()
{
return YearsService;
}
//overloads
bool Employee::operator == (const Employee &right)
{
bool status;
if ( EmpNum == right.EmpNum)
status = true;
else
status = false;
return status;
}
bool Employee::operator != (const Employee &right)
{
bool status;
if (EmpNum != right.EmpNum)
status = true;
else
status = false;
return status;
}

Answer 1

I think the parameter of loadFile should be of type LinkedQ, which, if I understand it correctly, is the queue class/struct, and the empIn variable should be of type Employee.
Edit:
The method you call on the empList object should be Enqueue, instead of addEmp.