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I have a decent chunk of code down, I just need to change the program to take in

ID: 3812773 • Letter: I

Question

I have a decent chunk of code down, I just need to change the program to take input from a separate file rather than from the user. Can someone help me out here?

My prompt is as follows:


Write an address book program that will accomplish the following:

Read name and address data from the user either from the keyboard or from a file.

While reading the names and addresses, put the names into an appropriate data structure.

After reading names and addresses, allow user to search for names and change the names or addresses in the container data structure.

Allow user to write out the container data structure to a comma delimited file, this file is different from the input file.

The input file will have the following form, 1 line for the name the next line for the address:

name

address

name

address

Use features of c++ that you have learned so far, such as classes, and dynamic data structures. You may not use the STL data structures. Your program will also be evaluated regarding readability and structure (functions, and methods).



#include<iostream>

using namespace std;
/*
* Node Declaration
*/

struct node {
string name;
string address;
struct node *next;
} *start;

/*
* Class Declaration
*/
class LinkedList {
public:
node *create_node(string, string);

void insert_begin();

void delete_pos();

void search();

void update();

void display();

LinkedList() {
start = NULL;
}
};

/*
* Main :contains menu
*/
int main() {
int choice, nodes, element, position, i;
LinkedList sl;
start = NULL;
while (1) {
cout << endl << "---------------------------------" << endl;
cout << endl << " PHONE BOOK " << endl;
cout << endl << "---------------------------------" << endl;
cout << "1.Add Contact" << endl;
cout << "2.Delete Contact" << endl;
cout << "3.Update Contact " << endl;
cout << "4.Search Contact" << endl;
cout << "5.Display Contact" << endl;
cout << "6.Exit " << endl;
cout << "Enter your choice : ";
cin >> choice;
switch (choice) {
case 1:
cout << "Adding a Contact: " << endl;
sl.insert_begin();
cout << endl;
break;
case 2:
cout << "Delete a Contact: " << endl;
sl.delete_pos();
cout << endl;
break;
case 3:
cout << "Update Node Value:" << endl;
sl.update();
cout << endl;
break;
case 4:
cout << "Search Contact: " << endl;
sl.search();
cout << endl;
break;
case 5:
cout << "Display All Contact" << endl;
sl.display();
break;
case 6:
cout << "Exiting..." << endl;
exit(1);
default:
cout << "Wrong choice" << endl;
}
}
}

/*
* Creating Node
*/
node *LinkedList::create_node(string name, string address) {
struct node *temp, *s;
temp = new(struct node);
if (temp == NULL) {
cout << "Memory not allocated " << endl;
return 0;
} else {
temp->name = name;
temp->address = address;
temp->next = NULL;
return temp;
}
}

/*
* Inserting element in beginning
*/
void LinkedList::insert_begin() {
string name;
string address;
cin.ignore(1, ' ');
cout << "Enter the name: ";
getline(cin, name);
cout << "Enter the Address: ";
getline(cin, address);
struct node *temp, *p;
temp = create_node(name, address);
if (start == NULL) {
start = temp;
start->next = NULL;
} else {
p = start;
start = temp;
start->next = p;
}
cout << "Contact added successfully" << endl;
}


/*
* Delete element at a given position
*/
void LinkedList::delete_pos() {

cin.ignore(1, ' ');
int pos, i, counter = 0;
string name;
if (start == NULL) {
cout << "Contact list is empty" << endl;
return;
}
cout << "Enter the name to be deleted: ";
getline(cin, name);
struct node *s, *ptr;
s = start;
if (s->name == name) {
start = s->next;
} else {
while (s != NULL) {
if (s->name == name) {
break;
}
ptr = s;
s = s->next;
}
ptr->next = s;
free(s);
cout << "Contact Deleted" << endl;
}
}

/*
* Update a given Node
*/
void LinkedList::update() {
cin.ignore(1, ' ');
string name;
string address;
string newName;
int pos, i;
if (start == NULL) {
cout << "List is empty" << endl;
return;
}

cout << "Enter the contact name be updated: ";
getline(cin, name);
cout << "Enter the New name: ";
getline(cin, newName);
cout << "Enter the Address: ";
getline(cin, address);
struct node *s, *ptr;
s = start;
if (s->name == name) {
if (!name.empty()) {
s->name = newName;
}
if (!address.empty()) {
s->address = address;

}
cout << "Contact Updated Successfully" << endl;
}
else {
while (s != NULL) {
if (s->name == name) {
if (!name.empty()) {
s->name = newName;
}
if (!address.empty()) {
s->address = address;

}
cout << "Contact Updated Successfully" << endl;
break;
}
s = s->next;

}
}
}

/*
* Searching an element
*/
void LinkedList::search() {
cin.ignore(1, ' ');
string name;
int pos = 0;
bool flag = false;
if (start == NULL) {
cout << "List is empty" << endl;
return;
}
cout << "Enter the Name to be searched: ";
getline(cin, name);
struct node *s;
s = start;
while (s != NULL) {
pos++;
if (s->name == name) {
flag = true;
cout << "Name: " << name << " is found at position " << pos << endl;
cout << "Address:" << s->address << endl;
}
s = s->next;
}
if (!flag)
cout << "Element " << name << " not found in the list" << endl;

}


/*
* Display Elements of a link list
*/
void LinkedList::display() {
struct node *temp;
if (start == NULL) {
cout << "The List is Empty" << endl;
return;
}
temp = start;
cout << "Elements of list are: " << endl;
while (temp != NULL) {
cout << temp->name << ",";
cout << temp->address << endl;
temp = temp->next;
}
cout << endl;
}

Explanation / Answer

Here is the modified code for you:

#include<iostream>
#include<fstream>
using namespace std;
/*
* Node Declaration
*/
struct node {
string name;
string address;
struct node *next;
} *start;
/*
* Class Declaration
*/
class LinkedList {
public:
node *create_node(string, string);
void insert_begin();
void delete_pos();
void search();
void update();
void display();
void readFile();
LinkedList() {
start = NULL;
}
};
/*
* Main :contains menu
*/
int main() {
int choice, nodes, element, position, i;
LinkedList sl;
start = NULL;
sl.readFile();
while (1) {
cout << endl << "---------------------------------" << endl;
cout << endl << " PHONE BOOK " << endl;
cout << endl << "---------------------------------" << endl;
cout << "1.Add Contact" << endl;
cout << "2.Delete Contact" << endl;
cout << "3.Update Contact " << endl;
cout << "4.Search Contact" << endl;
cout << "5.Display Contact" << endl;
cout << "6.Exit " << endl;
cout << "Enter your choice : ";
cin >> choice;
switch (choice) {
case 1:
cout << "Adding a Contact: " << endl;
sl.insert_begin();
cout << endl;
break;
case 2:
cout << "Delete a Contact: " << endl;
sl.delete_pos();
cout << endl;
break;
case 3:
cout << "Update Node Value:" << endl;
sl.update();
cout << endl;
break;
case 4:
cout << "Search Contact: " << endl;
sl.search();
cout << endl;
break;
case 5:
cout << "Display All Contact" << endl;
sl.display();
break;
case 6:
cout << "Exiting..." << endl;
exit(1);
default:
cout << "Wrong choice" << endl;
}
}
}

void LinkedList::readFile() {
   /** Takes input from a file titled AddressBook.txt.*/
   ifstream fin;
   fin.open("AddressBook.txt");
   if(!fin.is_open())
       cout << "Unable to open file. No addresses read." << endl;
   else {
   string name;
   string address;
   while(!fin.eof())  
   {
      getline(fin, name);
      getline(fin, address);
      struct node *temp = create_node(name, address);
      struct node *p;
      if (start == NULL) {
          start = temp;
          start->next = NULL;
      }
      else {
          p = start;
          start = temp;
          start->next = p;
      }
   }
   }
/** Done reading input.*/
}
/*
* Creating Node
*/
node *LinkedList::create_node(string name, string address) {
struct node *temp, *s;
temp = new(struct node);
if (temp == NULL) {
cout << "Memory not allocated " << endl;
return 0;
} else {
temp->name = name;
temp->address = address;
temp->next = NULL;
return temp;
}
}
/*
* Inserting element in beginning
*/
void LinkedList::insert_begin() {
string name;
string address;
cin.ignore(1, ' ');
cout << "Enter the name: ";
getline(cin, name);
cout << "Enter the Address: ";
getline(cin, address);
struct node *temp, *p;
temp = create_node(name, address);
if (start == NULL) {
start = temp;
start->next = NULL;
} else {
p = start;
start = temp;
start->next = p;
}
cout << "Contact added successfully" << endl;
}

/*
* Delete element at a given position
*/
void LinkedList::delete_pos() {
cin.ignore(1, ' ');
int pos, i, counter = 0;
string name;
if (start == NULL) {
cout << "Contact list is empty" << endl;
return;
}
cout << "Enter the name to be deleted: ";
getline(cin, name);
struct node *s, *ptr;
s = start;
if (s->name == name) {
start = s->next;
} else {
while (s != NULL) {
if (s->name == name) {
break;
}
ptr = s;
s = s->next;
}
ptr->next = s;
free(s);
cout << "Contact Deleted" << endl;
}
}
/*
* Update a given Node
*/
void LinkedList::update() {
cin.ignore(1, ' ');
string name;
string address;
string newName;
int pos, i;
if (start == NULL) {
cout << "List is empty" << endl;
return;
}
cout << "Enter the contact name be updated: ";
getline(cin, name);
cout << "Enter the New name: ";
getline(cin, newName);
cout << "Enter the Address: ";
getline(cin, address);
struct node *s, *ptr;
s = start;
if (s->name == name) {
if (!name.empty()) {
s->name = newName;
}
if (!address.empty()) {
s->address = address;
}
cout << "Contact Updated Successfully" << endl;
}
else {
while (s != NULL) {
if (s->name == name) {
if (!name.empty()) {
s->name = newName;
}
if (!address.empty()) {
s->address = address;
}
cout << "Contact Updated Successfully" << endl;
break;
}
s = s->next;
}
}
}
/*
* Searching an element
*/
void LinkedList::search() {
cin.ignore(1, ' ');
string name;
int pos = 0;
bool flag = false;
if (start == NULL) {
cout << "List is empty" << endl;
return;
}
cout << "Enter the Name to be searched: ";
getline(cin, name);
struct node *s;
s = start;
while (s != NULL) {
pos++;
if (s->name == name) {
flag = true;
cout << "Name: " << name << " is found at position " << pos << endl;
cout << "Address:" << s->address << endl;
}
s = s->next;
}
if (!flag)
cout << "Element " << name << " not found in the list" << endl;
}

/*
* Display Elements of a link list
*/
void LinkedList::display() {
struct node *temp;
if (start == NULL) {
cout << "The List is Empty" << endl;
return;
}
temp = start;
cout << "Elements of list are: " << endl;
while (temp != NULL) {
cout << temp->name << ",";
cout << temp->address << endl;
temp = temp->next;
}
cout << endl;
}

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