Question

You are asked to write a simple C++ phonebook application program. Here are the requirements for the application.

• read the contact information from a given input file (phonebook.txt) into a dynamically created array of Contact objects. Each line of the input line includes name and phone information of a contact. Assume that each name has a single part
• Allow to perform operations on array of data such as search for a person, create a new contact or delete an existing contact

A sample run:

***MY PHONEBOOK APPLICATION***

Please choose an operation:

A(Add) | S (Search) | D(Delete) |L(List) |Q(Quit): A

Enter name: MARY SMITH

Enter phone: 5062396

A(Add) | S (Search) | D(Delete) |L(List) |Q(Quit): S

Enter name: MARY SMITH

Phone Number: 5062396

A(Add) | S (Search) | D(Delete) |L(List) |Q(Quit): L

BARBARA BROWN 4059171

ELIZABETH JONES 2736877

LINDA WILLIAMS 3532665

PATRICIA JOHNSON 973437

…

A(Add) | S (Search) | D(Delete) |L(List) |Q(Quit): D

Enter name: LINDA WILLIAMS

A(Add) | S (Search) | D(Delete) |L(List) |Q(Quit): L

BARBARA BROWN 4059171

ELIZABETH JONES 2736877

PATRICIA JOHNSON 973437

…

A(Add) | S (Search) | D(Delete) |L(List) |Q(Quit): Q

Answer 1

code of header file "Contact.h"

using namespace std;

int pos = 0;
int capacity = 100;

class contact{
  public:
    string fName;
    string sname;
    string phone;
 static void listContacts(contact *vec){
  for(int i=0;i<pos;i++){
    cout<<vec[i].fName<<" "<<vec[i].sname<<" "<<vec[i].phone<<endl;
  }
}
static contact * addContact(contact *vec){
  contact c;
  cout<<"Enter name: ";
  cin>>c.fName>>c.sname;
  cout<<"Enter phone: ";
  cin>>c.phone;
  if(pos<capacity){
      vec[pos] = c;
      pos++;
    }
    else{
      capacity+=20;
      contact *temp = new contact[capacity];
      for(int i=0;i<pos;i++)
        temp[i] = vec[i];
      vec = temp;
      vec[pos] = c;
      pos++;
    }
  return vec;
}
static contact * searchContact(contact * vec){
  string f_name,s_name;
  cout<<"Enter name ";
  cin>>f_name>>s_name;
  for(int i=0;i<pos;i++){
    if(vec[i].fName==f_name && vec[i].sname==s_name){
      cout<<"Phone Number: "<<vec[i].phone<<endl;
      return vec;
    }
  }
  cout<<"Contact not found!"<<endl;
  return vec;
}
static contact * deleteContact(contact *vec){
  string f_name,s_name;
  cout<<"Enter name ";
  cin>>f_name>>s_name;
  for(int i=0;i<pos;i++){
    if(vec[i].fName==f_name && vec[i].sname==s_name){
      for(int j=i+1;j<pos;j++){
        vec[j-1] = vec[j];
      }
      pos--;
      return vec;
    }
}
  return vec;
}
};

Code for the implementation file containing main():

#include <iostream>
#include <vector>
#include <sstream>
#include <bits/stdc++.h>
#include "Contact.h"

using namespace std;
int main(){
  contact *vec = new contact[capacity];
  ifstream fin;
  fin.open("phonebook.txt");
  string line;
  while(fin){
    getline(fin,line);
    istringstream ss(line);
    contact record;
    ss>>record.fName>>record.sname>>record.phone;
    if(pos<capacity){
      vec[pos] = record;
      pos++;
    }
    else{
      capacity+=20;
      contact *temp = new contact[capacity];
      for(int i=0;i<pos;i++)
        temp[i] = vec[i];
      vec = temp;
      vec[pos] = record;
      pos++;
    }
  }
  pos--;
  char choice;
  do{
    cout<<"Please choose an operation:"<<endl;
    cout<<"A(Add)|S(Search)|D(Delete)|L(List)|Q(Quit):";
    cin>>choice;
    switch(choice){
      case 'A': vec = contact::addContact(vec);
            break;
      case 'S': contact::searchContact(vec);
            break;
      case 'D': vec = contact::deleteContact(vec);
            break;
      case 'L': contact::listContacts(vec);
    }
  }while(choice!='Q');
  fin.close();
  ofstream fout;
  fout.open("phonebook.txt");
  for(int i=0;i<pos;i++){
    fout<<vec[i].fName<<" "<<vec[i].sname<<" "<<vec[i].phone<<endl;
  }
  
}

output is as following: