Question

How do you use header files on a program?

I need to separate my program into header files/need to use header files for this program.Their needs to be 2-3 files one of which is the menu. thanks!

#include
#include
#include

using namespace std;

const int maxrecs = 5;

struct Teletype

{

string name;
string phoneNo;

Teletype *nextaddr;

};

void display(Teletype *);
void populate(Teletype *);
void modify(Teletype *head, string name);
void insertAtMid(Teletype *, string, string);
void deleteAtMid(Teletype *, string);
int find(Teletype *, string);
bool is_phone_no(string);

int main()

{

Teletype *list, *current;

string name;
string phoneNo;
int menu;

list = new Teletype; //new reserves space and returns the adress to the list

current = list;

for (int i = 0; i < maxrecs - 1; i++)
{
populate(current);
current->nextaddr = new Teletype;
current = current->nextaddr;
}

populate(current);
current->nextaddr = NULL;
cout << "The contents of the linked list is: " << endl;
display(list);

cout << "\nPlease select a number from the menu: " << endl;
cout << "(1)Insert new Structure on the linked list." << endl;
cout << "(2)Modify an existing structure in the Linked list." << endl;
cout << "(3)Delete an existing structure in the Linked list." << endl;
cout << "(4)Find an existing Structure from the Linked list." << endl;
cout << "(5)Exit the program." << endl;

cin >> menu;

switch (menu)
{
case 1: cout << "Enter Name and number" << endl;
cin >> name >> phoneNo;
insertAtMid(list, name, phoneNo);
cout << "The contents of the link list after inserting: " << endl;
display(list);
break;
case 2: cout << "\nName of the person you need to modify: ";
cin >> name;
modify(list, name);
display(list);
break;
case 3: cout << endl;
cout << "Enter Name " << endl;
cin >> name;
deleteAtMid(list, name);
cout << endl;
cout << "The contents of the linked list after deleting is: " << endl;
display(list);
break;
case 4: cout << endl<< endl;
cout << "Enter a name (last, first): ";
getline(cin, name); // getline because of the namespace
if (!find(list, name))
{
cout << "The name is not in the current phone list" << endl;
}
break;
case 5: break;
}

return 0;

}

void insertAtMid(Teletype *head, string name, string phone)
{
Teletype *tmp = new Teletype();
tmp->name = name;
tmp->phoneNo = phone;
tmp->nextaddr = head->nextaddr;
head->nextaddr = tmp;
}

void deleteAtMid(Teletype *head, string name)
{
while (head->nextaddr != NULL)
{
if (head->nextaddr->name == name)
{
Teletype *del = head->nextaddr;
head->nextaddr = head->nextaddr->nextaddr;
delete del;
}
head = head->nextaddr;
}
}

void display(Teletype *contents)
{
while (contents != NULL)
{
cout << endl
<< setw(30) << contents->name << setw(20) << contents->phoneNo;
contents = contents->nextaddr;
}
}

int find(Teletype *contents, string name)
{
int found = 0;
while (contents != NULL)
{
if (contents->name == name)
{
found = 1;
cout << setw(30) << contents->name << setw(20) << contents->phoneNo;
break;
}
else
{
contents = contents->nextaddr;
}
}
cout << endl;
return found;
}

void modify(Teletype *head, string name)
{
string phone;
while (head->nextaddr != NULL)
{
if (head->nextaddr->name == name)
{
cout << "Enter new name and phoneNumber: ";
cin >> name >> phone;
head->nextaddr->name = name;
head->nextaddr->phoneNo = phone;
return;
}
head = head->nextaddr;
}
cout << "No suchrecord found\n";
}

bool is_phone_no(string phoneNo)
{
for (auto it = phoneNo.begin(); it != phoneNo.end(); it++)
{
if (*it > '9' || *it < '0')
return false;
}
return true;
}

void populate(Teletype *record)
{
cout << "Enter a name: ";
getline(cin, record->name);
string phoneNo;
while (true)
{
cout << "Enter the phone number: ";
getline(cin, phoneNo);
try
{
if (!is_phone_no(phoneNo))
{
throw "Exception caught! Invalid phone number\n";
}
record->phoneNo = phoneNo;
break;
}
catch (const char *e)
{
cout << e;
}
}

return;
}

Answer 1

#######################################
        Teletype.cpp
#######################################
#include "Teletype.h"


void insertAtMid(Teletype *head, string name, string phone)
{
Teletype *tmp = new Teletype();
tmp->name = name;
tmp->phoneNo = phone;
tmp->nextaddr = head->nextaddr;
head->nextaddr = tmp;
}

void deleteAtMid(Teletype *head, string name)
{
while (head->nextaddr != NULL)
{
if (head->nextaddr->name == name)
{
Teletype *del = head->nextaddr;
head->nextaddr = head->nextaddr->nextaddr;
delete del;
}
head = head->nextaddr;
}
}

void display(Teletype *contents)
{
while (contents != NULL)
{
cout << endl
<< setw(30) << contents->name << setw(20) << contents->phoneNo;
contents = contents->nextaddr;
}
}

int find(Teletype *contents, string name)
{
int found = 0;
while (contents != NULL)
{
if (contents->name == name)
{
found = 1;
cout << setw(30) << contents->name << setw(20) << contents->phoneNo;
break;
}
else
{
contents = contents->nextaddr;
}
}
cout << endl;
return found;
}

void modify(Teletype *head, string name)
{
string phone;
while (head->nextaddr != NULL)
{
if (head->nextaddr->name == name)
{
cout << "Enter new name and phoneNumber: ";
cin >> name >> phone;
head->nextaddr->name = name;
head->nextaddr->phoneNo = phone;
return;
}
head = head->nextaddr;
}
cout << "No suchrecord found\n";
}

bool is_phone_no(string phoneNo)
{
for (auto it = phoneNo.begin(); it != phoneNo.end(); it++)
{
if (*it > '9' || *it < '0')
return false;
}
return true;
}

void populate(Teletype *record)
{
cout << "Enter a name: ";
getline(cin, record->name);
string phoneNo;
while (true)
{
cout << "Enter the phone number: ";
getline(cin, phoneNo);
try
{
if (!is_phone_no(phoneNo))
{
throw "Exception caught! Invalid phone number\n";
}
record->phoneNo = phoneNo;
break;
}
catch (const char *e)
{
cout << e;
}
}

return;
}





#######################################
          Teletype.h
#######################################
#include <iostream>
#include <cstdlib>
#include <iomanip>

using namespace std;

const int maxrecs = 5;

struct Teletype {

string name;
string phoneNo;

Teletype *nextaddr;

};

void display(Teletype *);
void populate(Teletype *);
void modify(Teletype *head, string name);
void insertAtMid(Teletype *, string, string);
void deleteAtMid(Teletype *, string);
int find(Teletype *, string);
bool is_phone_no(string);




#######################################
            main.cpp
#######################################
#include "Teletype.h"

int main()
{

        Teletype *list, *current;

        string name;
        string phoneNo;
        int menu;

        list = new Teletype; //new reserves space and returns the adress to the list

        current = list;

        for (int i = 0; i < maxrecs - 1; i++)
        {
                populate(current);
                current->nextaddr = new Teletype;
                current = current->nextaddr;
        }

        populate(current);
        current->nextaddr = NULL;
        cout << "The contents of the linked list is: " << endl;
        display(list);

        cout << "\nPlease select a number from the menu: " << endl;
        cout << "(1)Insert new Structure on the linked list." << endl;
        cout << "(2)Modify an existing structure in the Linked list." << endl;
        cout << "(3)Delete an existing structure in the Linked list." << endl;
        cout << "(4)Find an existing Structure from the Linked list." << endl;
        cout << "(5)Exit the program." << endl;

        cin >> menu;

        switch (menu)
        {
                case 1: cout << "Enter Name and number" << endl;
                cin >> name >> phoneNo;
                insertAtMid(list, name, phoneNo);
                cout << "The contents of the link list after inserting: " << endl;
                display(list);
                break;
                case 2: cout << "\nName of the person you need to modify: ";
                cin >> name;
                modify(list, name);
                display(list);
                break;
                case 3: cout << endl;
                cout << "Enter Name " << endl;
                cin >> name;
                deleteAtMid(list, name);
                cout << endl;
                cout << "The contents of the linked list after deleting is: " << endl;
                display(list);
                break;
                case 4: cout << endl<< endl;
                cout << "Enter a name (last, first): ";
                getline(cin, name); // getline because of the namespace
                if (!find(list, name))
                {
                cout << "The name is not in the current phone list" << endl;
                }
                break;
                case 5: break;
        }

        return 0;

}




Hi. Please find the answer above.. In case of any doubts, you may ask in comments. You may upvote the answer if you feel i did a good work!