Question

Hello, I'm learning how to code in C++ and am still getting used to using functions outside of int main(). Please help

Sample Run

Employee Management System

Command Menu
list - Display all employees
view - View an employee
add - Add an employee
del - Delete an employee
exit - Exit program

Command: list
1. John Rink, [email protected], 415-123-4567
2. Mike Anderson, [email protected], 415-111-2222

Command: view
Number (1 - 2): 3
Invalid number. Try again!

Command: view
Number (1 - 2): 2
Name: Mike Anderson, [email protected], 415-111-2222

Command: add
Name: Andy Patel
Email: [email protected]
Phone: [phone]
Andy Patel was added.

Command: del
Number (1 - 3): 5
This employee is not found. Try again!

Command: del
Number (1 - 3): 1
John Rink was deleted.

Command: list
1. Mike Anderson, [email protected], 415-111-2222
2. Andy Patel, [email protected], 415-222-3333

Command: exit

Thank you for using my app!

Specifications

• In your program, use this text file: employees.txt that stores the starting data for the program.
• Define a structure to store the data for each employee.
• When you start the program, it should read the employees from the tab-delimited text file and store them in a vector of Employee objects.
• When reading data from the text file, you can read all text up to the next tab by adding a tab character ('\t') as the third argument of the getline() function.
• When you add or delete an employee, the change should be saved to the text file immediately. That way, no changes are lost, even if the program crashes later.
• Your program should define the following functions:
  • void display_title();
  • void display_menu();
  • void read_file(vector<Employee> &employees);
  • void display(vector<Employee> &employees);
  • void view(int num, const vector<Employee> &employees);
  • void add(Employee employee, vector<Employee> &employees);
  • void delete(int num, vector<Employee> &employees);
• Your program should display error messages if the user enters invalid data.
• Your program should display the current number of employees in the vector for the user to enter the data properly.

Answer 1

Screenshot of program code:-

Screenshot of output:-

Program code to copy:-

#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

// Define a structure to store the data for each employee
struct Employee
{
   string name;
   string email;
   string phone;
};

//Functions prototype
void display_title();
void display_menu();
void read_file(vector<Employee> &employees);
void display(vector<Employee> &employees);
void view(int num, const vector<Employee> &employees);
void add(Employee employee, vector<Employee> &employees);
void del(int num, vector<Employee> &employees);

int main()
{
   // Decalre vector of Employee
   vector <Employee> employees;
   // Declare structure type variable
   Employee employee;
  
   // Calling function to display title
   display_title();
   // Calling function to display menu
   display_menu();
   // Calling function to read employee data from file
   read_file(employees);
  
   string command;
   int num, size;
   do
   {
       // Prompt and read command from user
       cout << "Command: ";
       cin >> command;
      
       if(command == "list")
           // Calling function to display all employee records
           display(employees);
       else if(command == "view")
           {
               // get the vector size
               size = employees.size();
               if(size == 0)
                   cout << "No employee record exist in the list" << endl;
               else
                   // prompt & read employee record number to be read from vector
                   cout << "Number (1 - " << size << "): ";
                   cin >> num;
                  
                   if(num>size)
                       cout << "Invalid number. Try again!" << endl;
                   else
                       // Calling function to view the record
                       view(num, employees);
           }  
       else if(command == "add")
           {
               cin.ignore();
               //Prompt & read employee data from user
               cout << "Name: "; getline(cin,employee.name);
               cout <<   "Email: "; getline(cin,employee.email);
               cout << "Phone: "; getline(cin,employee.phone);
               // calling function to add employee record into vector
               add(employee, employees);
           }
              
       else
       if(command == "del")
       {
           // get the vector size
           size = employees.size();
               if(size == 0)
                   cout << "No employee record exist in the list" << endl;
               else
                   // prompt & read employee record number to be deleted from vector
                   cout << "Number (1 - " << size << "): ";
                   cin >> num;
                   if(num>size)
                       cout << "This employee is not found. Try again!" << endl;
                   else
                       // calling function to delete employee record from vector
                       del(num, employees);
       }
   }while(command!="exit");
  
   cout << "Thank you for using my app!" << endl;
  
   return 0;
}

// Function to display title
void display_title()
{
   cout << "Employee Management System" << endl;
}

// Function to display menu
void display_menu()
{
   cout << "Command Menu" << endl;
   cout << "list - Display all employees" << endl;
   cout << "view - View an employee" << endl;
   cout << "add - Add an employee" << endl;
   cout << "del - Delete an employee" << endl;
   cout << "exit - Exit program" << endl;
}

// Function to read read employee record from file and
// store it into vector
void read_file(vector<Employee> &employees)
{
   ifstream fin;
   fin.open("employees.txt");
  
   Employee emp;
   while(!fin.eof())
   {
       getline(fin,emp.name,'\t');
       getline(fin,emp.email,'\t');
       getline(fin,emp.phone,'\n');
       employees.push_back(emp);
   }
}

// Function to display records of all employees in vector
void display(vector<Employee> &employees)
{
   //get the number of elements in vector
   int n = employees.size();
   struct Employee employee;
  
   for(int i=0; i<n; i++)
   {
       employee = employees[i];
       cout << employee.name << ", "
           << employee.email << ", "
           << employee.phone
           << endl;
   }  
}

// Function to read a specific employee record from vector
void view(int num, const vector<Employee> &employees)
{
   struct Employee employee;

   employee = employees[num-1];
   cout << employee.name << ", "
       << employee.email << ", "
       << employee.phone
       << endl;
}

// Function to add new employee record into vector
void add(Employee employee, vector<Employee> &employees)
{
   employees.push_back(employee);
   cout << employee.name << " was added." << endl;
}

// Function to delete specific employee record from file
void del(int num, vector<Employee> &employees)
{
   Employee employee = employees[num-1];
   employees.erase(employees.begin()+num-1);
   cout << employee.name << " was deleted." << endl;
}

Before executing above program you need to create a text file named "employees.txt" and store it into your current working folder. The data in text file is seperated by tab space.