C++ Virtual Void - c++

Okay, so I have a parent class called employee and 3 subclass called manager,researcher and engineer. I made a vector and want to list them. this is the how I process the making.
vector <Employee*,Manager*> EmployeeDB;
Employee *temp;
temp = new Manager(first, last, salary, meetings, vacations);
EmployeeDB.push_back(temp);
I have no problem in making the vector, my concern is listing the info. all 3 subclasses have firstname, lastname and salary but they're difference is that they have different data members which is unique, example the Manager has the int value vacation and the Engineer has the int value experience so on and so forth.
Employee.h:
#include <iostream>
#include <string>
using namespace std;
#ifndef EMPLOYEE_h
#define EMPLOYEE_h
class Employee
{
public:
Employee();
Employee(string firstname, string lastname, int salary);
string getFname();
string getLname();
int getSalary();
virtual void getInfo();
private:
string mFirstName;
string mLastName;
int mSalary;
};
#endif
Employee.cpp:
#include "Employee.h"
#include <iostream>
#include <string>
using namespace std;
Employee::Employee()
{
mFirstName = "";
mLastName = "";
mSalary = 0;
}
Employee::Employee(string firstname, string lastname, int salary)
{
mFirstName = firstname;
mLastName = lastname;
mSalary = salary;
}
string Employee::getFname()
{
return mFirstName;
}
string Employee::getLname()
{
return mLastName;
}
int Employee::getSalary()
{
return mSalary;
}
void Employee::getInfo()
{
cout << "Employee First Name: " << mFirstName << endl;
cout << "Employee Last Name: " << mLastName << endl;
cout << "Employee Salary: " << mSalary << endl;
}
Main:
#include <vector>
#include <iostream>
#include <string>
#include "Employee.h"
#include "Engineer.h"
#include "Manager.h"
#include "Researcher.h"
using namespace std;
vector <Employee*> EmployeeDB;
Employee *temp;
void add()
{
int emp, salary, vacations, meetings, exp, c;
string first, last, type, school, topic;
bool skills;
do
{
system("cls");
cout << "===========================================" << endl;
cout << " Add Employee " << endl;
cout << "===========================================" << endl;
cout << "[1] Manager." << endl;
cout << "[2] Engineer." << endl;
cout << "[3] Researcher." << endl;
cout << "Input choice: ";
cin >> emp;
system("cls");
} while (emp <= 0 || emp > 3);
cout << "===========================================" << endl;
cout << " Employee Info " << endl;
cout << "===========================================" << endl;
cout << "Employee First name: ";
cin >> first;
cout << "Employee Last name: ";
cin >> last;
cout << "Employee Salary: ";
cin >> salary;
switch (emp)
{
case 1:
cout << "Employee numbers of meetings: ";
cin >> meetings;
cout << "Employee numbers of vacations: ";
cin >> vacations;
temp = new Manager(first, last, salary, meetings,vacations);
EmployeeDB.push_back(temp);
delete temp;
break;
case 2:
cout << endl;
cout << "[1]YES [2]NO" << endl;
cout << "Employee C++ Skills: ";
cin >> c;
if (c == 1)
{
skills = true;
}
else
{
skills = false;
}
cout << "Employee Years of exp: ";
cin >> exp;
cout << "(e.g., Mechanical, Electric, Software.)" << endl;
cout << "Employee Engineer type: ";
cin >> type;
temp = new Engineer(first, last, salary, skills, exp, type);
EmployeeDB.push_back(temp);
delete temp;
break;
case 3:
cout << "Employee School where he/she got his/her PhD: ";
cin >> school;
cout << "Employee Thesis Topic: ";
cin >> topic;
temp = new Researcher(first, last, salary, school, topic);
EmployeeDB.push_back(temp);
delete temp;
break;
}
}
void del()
{
}
void view()
{
for (int x = 0; x < (EmployeeDB.size()); x++)
{
cout << EmployeeDB[x]->getInfo();
}
}
void startup()
{
cout << "===========================================" << endl;
cout << " Employee Database " << endl;
cout << "===========================================" << endl;
cout << "[1] Add Employee." << endl;
cout << "[2] Delete Employee." << endl;
cout << "[3] List Employees." << endl;
cout << "[4] Exit." << endl;
cout << "Please Enter Your Choice: ";
}
int main(int argc, char** argv)
{
bool flag = true;
int choice;
do {
do
{
system("cls");
system("pause>nul");
startup();
cin >> choice;
} while (choice < 0 || choice >4);
switch (choice)
{
case 1:
add();
break;
case 2:
del();
break;
case 3:
view();
break;
case 4:
flag = false;
system("EXIT");
break;
}
} while (flag == true);
return 0;
system("pause>nul");
}
I am getting error on the view() function.
It says no operator<< matches these operands
binary '<<': no operator found which takes a right hand operand of type void etc etc.

The problem is that the getInfo has return type void and you are trying to put that return value into cout.
It's important to understand that the code std::cout << val actually calls the function operator<<(ostream& out, const objectType& val) where objectType is the type of 'val'.
In your case the type is void, and there is simply no implementation of operator<< that takes void as a type. hence the error "no operator found which takes a right hand operand of type void...".
In order to fix your issue you have a few options:
Change view() to be
for (...)
{
EmployeeDB[x]->getInfo();
}
Change getInfo() to return a string the info as you'd like:
std::string getInfo()
{
std::string info;
info =...
return info;
}
Create an operator<< for Employee and change view to call it:
view()
{
for (...)
{
std::cout << EmployeeDB[x];
}
}

Related

Program Ends unexpectedly after the function is called

I have to write a program for bank.The classes if you will say I will provide but the problem is here,
My Problem is that in my main program I first call a function called BankProgram(); But there are other statements in the function after the function is being called The below code isnt executed at all
cout << "Enter y for opening menu again and n for exiting\t";
cin >> option;
while (option != 'y' || option != 'n')
{
cout << "Enter right value Please! only y or n: ";
char option1;
cin >> option1;
if (option1 == 'y' || option1 == 'n')
{
break;
}
}
if (option == 'y')
{
goto label;
}
else if (option == 'n')
{
cout << "The program is ending now! ";
}
Although I want to display the menu again for the user to do anything in the bank but the program terminates and exits I dont know why.I think there is a problem with object lifetime but I think that must not be the problem
Any help is appreciated.
This is the AddAccount Class
#pragma once
#include<iostream>
#include<string>
#include <vector>
using namespace std;
class Accounts
{
vector<int> Account_ID;
vector<string> AccountType;
vector<int> Customer_ID;
vector<int> Account_Balance;
public:
Accounts();
void WithDraw(int);
void Deposit(int,string,int,int);//Also can be named as add Account
void Balance();
void DeleteAccount(int);
int getAccountsNumber();
};
//Definning classes methods
Accounts::Accounts()
{
//no need to initialize vectors.They work perfect without initializing.C++ has done work for it
}
void Accounts::Deposit(int AID,string AT,int CID,int AB)
{
this->Account_ID.push_back(AID);
this->AccountType.push_back(AT);
this->Customer_ID.push_back(CID);
this->Account_Balance.push_back(AB);
}
void Accounts::WithDraw(int index)
{
cout << "\nThe Account ID of " << (index + 1) << " person is equal to: "
<< this->Account_ID[index] << endl;
cout << "\nThe Account Type of " << (index + 1) << " person is equal to: "
<< this->AccountType[index] << endl;
cout << "\nThe Customer ID of " << (index + 1) << " person is equal to: "
<< this->Customer_ID[index] << endl;
cout << "\nThe Account Balance of " << (index + 1) << " person is equal to: "
<< this->Account_Balance[index] << endl;
}
void Accounts::DeleteAccount(int index)
{
Account_ID.erase(Account_ID.begin()+index);
AccountType.erase(AccountType.begin()+index);
Customer_ID.erase(Customer_ID.begin()+index);
Account_Balance.erase(Account_Balance.begin()+index);
//Displaying that the account is successfully removed from the bank
cout << "\nThe Account ID of " << (index + 1) << " was successfully removed from the bank";
cout << "\nThe Account Type of " << (index + 1) <<" was successfully removed from the bank";
cout << "\nThe Customer ID of " << (index + 1) << " was successfully removed from the bank";
cout << "\nThe Account Balance of " << (index + 1) << " was successfully removed from the bank";
}
//It will display all the balance in the bank
void Accounts::Balance()
{
//The static int is not changed on the iteration where ever used in the loop or where ever
static int sum = 0;//To store the sum of all balance
for (unsigned int i = 0; i < Account_Balance.size(); i++)
{
sum = sum + Account_Balance[i];
}
cout << "The total balance in the bank is equal to : " << sum;
}
int Accounts::getAccountsNumber()
{
return Account_ID.size();
}
This is the Customer Class
#pragma once
#include<string>
using namespace std;
#include"Accounts.h"
#include"Manager.h"
class Customer
{
vector<string> Name;
vector<int> ID;
public:
Customer();
void AddCustomer(string,int);
void PrintAllCustomersData();
void DeleteCustomer(int);
void Print_CustomerDetails(int);
string getCustomerName(int);
};
void Customer::AddCustomer(string n, int id)
{
this->Name.push_back(n);
this->ID.push_back(id);
cout << "\nThe customer " << n << "with Id: " << id << " was successfully added in the Bank.";
}
void Customer::PrintAllCustomersData()
{
for (unsigned int i = 0; i < ID.size(); i++)
{
cout << "\nThe ID of " << (i + 1) << "Customer is : " << ID[i] << " and NAME is : " << Name[i];
}
}
void Customer::DeleteCustomer(int index)
{
Name.erase(Name.begin() + index);
ID.erase(ID.begin() + index);
cout << "\nThe customer with Name : " << Name[index] << " and ID: " << ID[index] << " was successfully deleted\n";
}
void Customer::Print_CustomerDetails(int index)
{
cout << "The Customer Name is : " << Name[index] << endl;
cout << "The Id of Customer is : " << ID[index] << endl;
}
string Customer::getCustomerName(int index)
{
return (Name[index]);
}
This is the Manager Class
#pragma once
#include<iostream>
#include<string>
using namespace std;
class Manager
{
string Name;
string Branch;
int ID;
public:
void Print_ManagerDetails();
friend ostream& operator<<(ostream&, const Manager& M);
friend istream& operator>>(istream&, Manager& M);
};
void Manager::Print_ManagerDetails()
{
cout << "\nThe ID of Manager is : " << ID << endl;
cout << "\nThe Name of Manager is : " << Name << endl;
cout << "\nThe Branch of Manager is : " << Branch << endl;
}
istream& operator>>(istream& input, Manager& M) {
input >> M.ID >> M.Name>>M.Branch;
return input;
}
ostream& operator<<(ostream& output, const Manager& M) {
output << "\nThe ID of Manager is : " << M.ID<<endl;
output << "\nThe Name of Manager is : " << M.Name << "\nThe Branch of Manager is : " << M.Branch<<endl;
return output;
}
This is the Bank Class
#pragma once
#include"Customer.h"
#include"Accounts.h"
class Bank
{
Customer* customers_ptr;
Accounts* Accounts_ptr;
Manager manager;
public:
Bank();
void AddAccount(int,string,int,int);
void DeleteAccount(int);
void AddCustomer(string,int);
void DeleteCustomer(int);
int GetNoOfAccounts();
string GetCustomer_Name(int);
};
Bank::Bank()
{
cout << "\nThe program is in the bank class\n";
}
void Bank::AddAccount(int AID, string AT, int CID, int AB)
{
Accounts_ptr->Deposit(AID, AT, CID, AB);
}
void Bank::DeleteAccount(int index)
{
Accounts_ptr->DeleteAccount(index);
}
void Bank::AddCustomer(string name, int ID)
{
customers_ptr->AddCustomer(name, ID);
}
void Bank::DeleteCustomer(int index)
{
customers_ptr->DeleteCustomer(index);
}
int Bank::GetNoOfAccounts()
{
int num=Accounts_ptr->getAccountsNumber();
return num;
}
string Bank::GetCustomer_Name(int index)
{
string name = customers_ptr->getCustomerName(index);
return name;
}
This is the main program
#include<iostream>
#include<string>
#include<conio.h>
#include<algorithm>
#include"Bank.h"
#include"Customer.h"
#include"Manager.h"
#include"Accounts.h"
using namespace std;
void BankProgram();
void BankProgram()
{
Bank b1;
Accounts A1;
Manager m1;
char options;
cout << "\n\nEnter what you want to do \n1 for entering the managers data,\n2 for showing the managers data "
<< "\n3 for adding a customer in the bank\n4 for adding an account in the bank \n5 for deleting the customer\n"
<< "\n5 for deleting the account\n6 for getting customer name\n7 for getting No. of accounts"
<< "\n8 for seeing all the balance in the bank\nPress 'e' for exit";
cin >> options;
switch (options)
{
case '1':
{
//The manager class data
cout << "\nEnter the name,ID,Branch Of Manager: ";
cin >> m1;
break;
}
case '2':
{
cout << "\nThe data of Manager is :" << m1;
break;
}
case '3':
{
string Cname;
int CID;
cout << "\nEnter the name of customer: ";
cin >> Cname;
cout << "\nEnter the Customer ID: ";
cin >> CID;
b1.AddCustomer(Cname, CID);
break;
}
case '4':
{
int AID;
int CID;
int AB;
string AT;
cout << "\nEnter the name of Account ID: ";
cin >> AID;
cout << "\nEnter the name of Customer ID: ";
cin >> CID;
cout << "\nEnter the name of Account BALANCE: ";
cin >> AB;
cout << "\nEnter the name of Account Type: ";
cin >> AT;
b1.AddAccount(AID, AT, CID, AB);
break;
}
case '5':
{
int index;
cout << "\nEnter the customer which you want to delete: ";
cin >> index;
b1.DeleteCustomer(index);
break;
}
case '6':
{
int index;
cout << "\nEnter the account which you want to delete: ";
cin >> index;
b1.DeleteAccount(index);
break;
}
case '7':
{
int cn;
cout << "\nEnter the customer ID which you want to get name: ";
cin >> cn;
b1.GetCustomer_Name(cn);
break;
}
case '8':
{
b1.GetNoOfAccounts();
break;
}
case '9':
{
A1.Balance();
break;
}
case 'e':
{
cout << "The program is ending now: ";
break;
}
default:
{
cout << "\n\nEnter right value please: \n";
}
}
}
int main()
{
// BankProgram();
bool flag = true;
char option;
label:
BankProgram();
cout << "Enter y for opening menu again and n for exiting\t";
cin >> option;
while (option != 'y' || option != 'n')
{
cout << "Enter right value Please! only y or n: ";
char option1;
cin >> option1;
if (option1 == 'y' || option1 == 'n')
{
break;
}
}
if (option == 'y')
{
goto label;
}
else if (option == 'n')
{
cout << "The program is ending now! ";
}
}
Well it turns out to be very simple
Bank::Bank()
{
cout << "\nThe program is in the bank class\n";
}
void Bank::AddAccount(int AID, string AT, int CID, int AB)
{
Accounts_ptr->Deposit(AID, AT, CID, AB);
}
Accounts_ptr is an uninitialised pointer, using it results in a program crash. You must give Accounts_ptr a value in the Bank constructor.
You have the same issue with customers_ptr.

How can I access elements of a vecotor in C++

Actually, I am rookie, and I started to learning this language a few months age. Now, I confronted with an insoluble issue. I devised a program to get information of numerous employee's specification and store it in a vector. In order to acquire better performance, I designed a class named "Employee", and defined a function to give some options to user, like adding new employee, promotion a specific employee's salary and so on.
I defined my matching criterion through operators, but there is an error in program, and that is when I want to display, the output is completely weird. it looks like a some kind of Chinese letter :-)
here is my code:
Thanks
My major problem is when it comes displaying employee's specification
#include <iostream>
#include <string>
#include <vector>
#include <memory>
#include <sstream>
using namespace std;
class Employee
{
public:
Employee(string FirstName, string LastName, int age , double Salary, bool Status ) ://constructor
fName(FirstName), lName(LastName), EmpAge(age), EmpSalary(Salary), RecruitmentStatus(Status) {};
void setSalary(const double&);
void SetRecruitmentStatus(const bool&);
void Promote(const double&);
//====================================//
operator const char* ()
{
ostringstream formattedOutput;
formattedOutput << this->fName.c_str() << " " << (this->lName.c_str()) << " | " << this->EmpAge << " | " << this->EmpSalary << ((RecruitmentStatus) ? "Working" : "Fired");
string output = formattedOutput.str();
return output.c_str();
}
bool operator == (const Employee& anotherEmployee)const
{
return (this->lName == anotherEmployee.lName);
}
bool operator < (const Employee& anotherEmployee)const
{
return (this->EmpSalary < anotherEmployee.EmpSalary);
}
private:
string fName, lName;
int EmpAge;
double EmpSalary;
bool RecruitmentStatus;
};
void Employee::setSalary(const double& income)
{
this->EmpSalary += income;
}
void Employee::SetRecruitmentStatus(const bool& Status)
{
this->RecruitmentStatus = Status;
}
void Employee::Promote(const double& Promotion)
{
this->EmpSalary += Promotion;
}
template <typename T>
void displayElements(T& input)
{
for (auto iterator = input.begin();
iterator != input.end(); iterator++)
{
cout << *iterator << endl;
}
}
void selection(int&);
Employee getNewEmp(void);
int main()
{
vector<Employee> Records;
int ID;
do
{
selection(ID);
switch (ID)
{
case 1:
{
Records.push_back(getNewEmp());
break;
}
case 2:
{
cout << "please enter last name of the employee you want to change his/her recruitment'status: ";
string lastName; cin >> lastName; cout << endl;
auto memberLocation = find(Records.begin(), Records.end(), lastName.c_str());
break;
}
case 3:
{
cout << "please enter last name of the employee you want to promote his/her recruitment'salary: ";
string lastName; cin >> lastName; cout << endl;
auto memberLocation = find(Records.begin(), Records.end(), lastName.c_str());
break;
}
default:
{
if (ID !=4)
{
cout << "Wrong selection!\nThe program will be closed after a few seconds\n";
exit(1);
}
}
}
} while (ID != 4);
displayElements(Records);
cout << "Thanks for using this program\n";
return 0;
}
void selection(int& input)
{
system("cls");
cout << "please Choose one of these option:\n"
"1. add a new employee\n"
"2. changing an employee status\n"
"3. Promote an employee's salary\n"
"4. exit : ";
cin >> input;
}
Employee getNewEmp(void)
{
system("cls");
string firstName, lastName;
cout << "first name:"; cin >> firstName; cout << endl;
cout << "last name:"; cin >> lastName; cout << endl;
int age;
cout << "Age: "; cin >> age; cout << endl;
double salary;
cout << "Offered Salary: "; cin >> salary; cout << endl;
bool Status;
cout << "Is he/she working(1) or got fired(0) : "; cin >> Status; cout << endl;
return Employee(firstName, lastName, age, salary, Status);
}

overriden method first c++

I am reading a book about c++ programming and there is an exercice that should be solved with virtual:
//Main.cpp
#include "stdafx.h"
#include "Employee.h"
#include "Manager.h"
#include <vector>
#include <iostream>
#include <stdlib.h>
using namespace std;
//Generates the choice of which type of employee we are working on.
int generate_type_choice() {
cout << "1.Manager" << endl;
cout << "2.Enginner" << endl;
cout << "3.Researcher" << endl;
int choice=0;
cin >> choice;
return choice;
}
void addEmployee(vector<Employee*>* v) {
int choice = generate_type_choice();
cout << "first name: ";
string Fname;
cin.ignore();
getline(cin, Fname);
string Lname;
cout << "Last Name: ";
getline(cin, Lname);
cout << "Salary: ";
float s;
cin >> s;
switch (choice) {
case 1: {
cout << "Number of Meetings per week: ";
int m,vac;
cin >> m;
cout << "Number of vacation days per year: ";
cin >> vac;
Employee* e = new Manager(Fname, Lname, s, m, vac);
(*v).push_back(e);
break;
}
}
(*v).push_back(new Employee(Fname, Lname, s));
}
void printVector(vector<Employee*> v) {
for each (Employee* e in v)
{
(*e).printData();
}
}
int main()
{
vector<Employee*> v;
int choice = 0;
cout << "1.Add Employee" << endl;
cin >> choice;
switch (choice) {
case 1: {
addEmployee(&v);
}
}
printVector(v);
system("pause");
return 0;
}
//Employee.cpp
#include "stdafx.h"
#include "Employee.h"
#include <string>
#include <iostream>
using namespace std;
Employee::Employee()
{
Fname = "NoName";
Lname = "NoName";
salary = 0;
}
Employee::Employee(string f, string l, float s) {
Fname = f;
Lname = l;
salary = s;
}
void Employee::printData() {
cout << "First Name: " << Fname << endl;
cout << "Last Name: " << Lname << endl;
cout << "salary: " << salary << endl;
}
//Manage.cpp
#include "stdafx.h"
#include "Manager.h"
#include <string>
#include <iostream>
using namespace std;
Manager::Manager()
{
NumMeetings=0;
NumVacations=0;
}
void Manager::printData() {
cout << "Number of meetings per week: " << NumMeetings << endl;
cout << "Number of vacation days per year: " << NumVacations << endl;
}
what i want here is to call the employee::printData and after that call Manager::printData
...
(Employee is the parent Class of Manager)
i didn't put Getters and Setters to reduce the code and it is not a finished code so switch doesn't have only one case
You can use the :: to call the superclass' operator:
void Manager::printData() {
Employee::printData();
cout << "Number of meetings per week: " << NumMeetings << endl;
cout << "Number of vacation days per year: " << NumVacations << endl;
}
You can call the base function from the derived function.
void Manager::printData() {
cout << "Number of meetings per week: " << NumMeetings << endl;
cout << "Number of vacation days per year: " << NumVacations << endl;
Employee::printData();
}
Will print the Manager part and then Employee::printData(); will call printData just using the Employee part of the object to print out the rest.

vector.erase - it deletes my last element always

First time here, an amateur programmer, I have quite a bit of issue. I want to make a virtual model shop. I can add new items, check the inventory, all in a vector but when I want to delete a specific item (by producer&name&scale) it always deletes the last element.
#include <iostream>
#include <string>
#include <fstream>
#include <vector>
using namespace std;
class model
{
private:
int price;
string scale, name, producer;
public:
vector<model> vectorr;
model();
virtual ~model();
int getprice();
string getscale();
string getname();
string getproducer();
void setprice(int);
void setscale(string);
void setname(string);
void setproducer(string);
friend ostream &operator>>(ostream &stream, model &mt);
model &operator=(model &mt);
};
That's the header.
#include <iostream>
#include "header1.h"
#include <string>
#include <conio.h>
#include <vector>
using namespace std;
int main()
{
vector<machete> vectorr;
machete c;
machete t;
cout << "Welcome to the shop , what do you want to do?" << endl;
cout << "Chose your destiny : 1. Add 2.Get 3.Remove 4.Sort 0.Quit" << endl;
int menu, temp2;
string temp;
cin >> menu;
while (menu != 0) {
switch (menu) {
case 0 : cout << "Bye bye";
_getch();
exit(1);
break;
case 1 : cout << "Enter a producer" << endl;
cin >> temp;
c.setproducer(temp);
cout << "Enter a name" << endl;
cin >> temp;
c.setname(temp);
cout << "Enter a scale" << endl;
cin >> temp;
c.setscale(temp);
cout << "Enter a price" << endl;
cin >> temp2;
c.setprice(temp2);
vectorr.push_back(c);
cout << "You have succesfully added a model !" << endl;
break;
case 2 : cout << "Producer | Name | Scale | Price" << endl;
for (std::vector<model>::iterator it = vectorr.begin(); it != vectorr.end(); ++it) {
cout >> *it;
}
cout << endl;
break;
case 3 : cout << "What do you want to remove?" << endl;
cout << "Enter the producer" << endl;
string producer;
cin >> producer;
cout << "Enter the name" << endl;
string name;
cin >> name;
cout << "Enter the scale" << endl;
string scale;
cin >> scale;
for (unsigned i = 0; i < vectorr.size(); ++i) {
t.setname(vectorr[i].getnume());
t.setproducer(vectorr[i].getproducator());
t.setscale(vectorr[i].getscara());
if (t.getname() == name && t.getproducer() == producer && t.getscle() == scale) {
vectorr.erase(vectorr.begin() + i);
cout << "You have succesfully erased the " << name << " model" << endl;
break;
}
}
break;
}
cout << "Chose your destiny : 1. Add 2.Get 3.Remove 4.Sort 0.Quit" << endl;
cin >> menu;
}
return 0;
}
That's the main. case 3 is the problem deleting thingamajack. It always deletes the last element in my vector. The if(name=name and so on) works properly, tested it three times to be sure that wasn't the problem. It appears whatever I write vectorr.erase just won't work the way I want it to.
Sorry for the messy code, I might have done something wrong before the case 3, ignore case 4 the sort, not implemented yet, any help is appreciated, thanks!
In case 2, you've written
std::vector<model>::iterator it = vectorr.begin()
whereas you defined
vector<machete> vectorr;
I think you've confused between machete and model.

Address Book using Inheritance and Operator Overloading or Exception handling

I have to make an address book using C++ and should include classes and inherited classes. The main class contains name and address and the inherited Teacher class contains teacher Phone number and CNIC and Employee class contains Phone and CNIC and the Student class contains student ID and Phone. I made a program in C++ but that would always over write the previous data. I am stuck here. I would need a skull program or simple algorithms to guide me ahead.
This is my code.
// new.cpp : Defines the entry point for the console application.
// Address Book.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include<iostream>
#include<string>
#include <conio.h>
#include <fstream>
#include <sstream>
#include <iomanip>
using namespace std;
class Main
{
private:
string Name;
string Address;
char test;
public:
virtual void getdata()
{
ofstream outfile("TEMP.txt");
cout <<"Enter Name: " ;
cin>>test;
getline(cin, Name); //cin >> Name;
cout << endl;
cout << "Enter Address: ";
getline(cin, Address);// cin >> Address;
outfile << Name
<< endl
<< Address;
}
virtual void setdata()
{
cout << "\n\nName: " << test+Name;
cout << "\nAddress: " << Address;
}
virtual void remove()
{
}
};
//----------------------------------------------------------
class Teacher : public Main
{
private:
int T_Number;
string T_CNIC;
public:
void getdata()
{
ofstream outfile("Teacher.txt");
Main::getdata();
cout << "Enter CNIC: ";
getline(cin,T_CNIC);//cin >> T_CNIC;
cout << "Enter Contact Number: " << endl;
cin >> T_Number;
outfile << T_CNIC
<< endl
<< T_Number;
cout << "Data entered" << endl;
}
void setdata()
{
Main::setdata();
cout << "\nTeacher CNIC: " << T_CNIC;
cout << "\nTeacher Contact Number: " << T_Number;
}
};
//------------------------------------------------------------
class Student : public Main
{
private:
int S_Number;
int S_ID;
public:
void getdata()
{
ofstream outfile("Student.txt");
Main::getdata();
cout << "Enter ID: ";
cin >> S_ID;
cout << "Enter Contact Number: ";
cin >> S_Number;
outfile << S_ID
<< endl
<< S_Number;
cout << "Data entered" << endl;
}
void setdata()
{
Main::setdata();
cout << "\nStudent Unique ID: " << S_ID;
cout << "\nStudent Contact Number: " << S_Number;
}
};
class Employee : public Main
{
private:
int E_Number;
string E_CNIC;
public:
void getdata()
{
ofstream outfile("Employee.txt");
Main::getdata();
cout << "Enter Employee CNIC: ";
getline(cin,E_CNIC);//cin >> E_CNIC;
cout << "Enter Contact Number: ";
cin >> E_Number;
outfile << E_CNIC
<< endl
<< E_Number;
cout << "Data entered" << endl;
;}
void setdata()
{
Main::setdata();
cout << "\nEmployee Unique ID: " << E_CNIC;
cout << "\nEmployee Contact Number: " << E_Number;
}
};
//-----------------------------------------------------------------------------------------
int _tmain(int argc, _TCHAR* argv[])
{
Main* myarr[100];
int var = 0;
int choice;
char input;
start:
printf("===============MAIN MENU===============");
printf("\n[1]Insert\n[2]Search\n[3]Delete\n[4]Exit\n");
printf("=======================================");
printf("\n\nEnter Your Choice: ");
cin >> choice;
switch(choice)
{
case 1:
cout << "\nEnter data for Student or Teacher or Employee (s/t/e)? ";
cin >> input;
do
{
if( input=='t' )
myarr[var] = new Teacher;
else if (input == 'e')
myarr[var] = new Employee;
else
myarr[var] = new Student;
myarr[var++]->getdata();
cout << " Enter another (y/n)? ";
cin >> input;
if(input == 'n')
{
goto start;
}
}
while( input =='y');
for(int j=0; j<var; j++)
myarr[j]->setdata();
cout << endl;
break;
case 2:
return 0;
break;
case 3:
return 0;
break;
case 4:
cout << "Are you sure you want to quit? " << endl;
getch();
break;
default:
cout << "Choose from 1 - 4 ONLY!!" << endl;
goto start;
break;
}
return 0;
}
Then I would try declared it protected, and instead of calling main::getdata(), you directly write data into the file. see if that works.