Question

Question 6 Consider a case of single inheritance where Landline phone is a base class and Mobile phone is the derived class. Both the classes are as follow: (a) Landline: It has subscriber name and number as data members. The member functions are to provide the features of calling on a subscriber's number and receiving a call Void call (int sub_number) Void receivel (b) Mobile: Apart from inheriting the features of a Landline phone, it provides following additional features: (i) Maintaining a phonebook to save the name and phone number of friends and relatives. For this, a data member of type array of strings has to be added. (ii) Calling to a subscriber with its name. Void call (string sub_name): This function first searches the name of the subscriber to be called in the phonebook to find the corresponding phone number and then, invokes the function "void call (int sub_number" by passing the searched phone number as argument. (ii) Maintaining a list of last 20 dialled numbers. For this, a data member of type array of 20 integers has to be added. An entry will be made to this array each time whenever call) function will be invoked. In case of 21th entry to the array, the earliest entry will be replaced with the latest entry iv) Calling on a number from the list of dialled numbers. This function first displays the list of dialled numbers and provides an option to choose a phone number from the list to which a call has to be made. Finally, it invokes call) function and passes the chosen phone number as an argument Finally, write the main program to show the features of each class

write it in c++

Answer 1

#include<iostream>
#include<string>
#include<vector>
#include<stdio.h>
#include<string.h>
using namespace std;
class Landline{
private:
   string subscriber_name;
   long long int subscriber_number;
public:
   Landline();
   Landline(string,long long int);
   void call(long long int);
   void receive();
};
Landline::Landline(){
   subscriber_name="null";
   subscriber_number=1234567890;
}
Landline::Landline(string subscriber_name_in,long long int subscriber_number_in){
   subscriber_name=subscriber_name_in;
   subscriber_number=subscriber_number_in;
}
void Landline::call(long long int number_in){
   cout<<"Calling to number: "<<number_in<<" ..."<<endl;
}
void Landline::receive(){
   cout<<"Receiving call ...."<<endl;
}

class Mobile : public Landline{
private:
   string subscriber_name;
   long long int subscriber_number;
   vector< pair<string,long long int> > Phonebook;
   long long int dailed_numbers[20];
   int dailed_count;
public:
   void call_by_name();
   long long int getNumberForName(string);
   void init_Phonebook(vector< pair<string,long long int> >);
   void update_dailed_numbers();
   void call_from_dailed_numbers();
   Mobile();
   Mobile(string,long long int);
};
Mobile::Mobile(){
   subscriber_name="MobileUserName";
   subscriber_number=1234567890;
   dailed_count=0;
}
Mobile::Mobile(string Mob_sub_name,long long int mob_sub_number){
   subscriber_name=Mob_sub_name;
   subscriber_number=mob_sub_number;
   dailed_count=0;
}
void Mobile::call_by_name(){
   cout<<"Printing PhoneBook contacts ...."<<endl;
for (int i=0; i<Phonebook.size(); i++)
{
// "first" and "second" are used to access
// 1st and 2nd element of pair respectively
cout << Phonebook[i].first << " "
<< Phonebook[i].second << endl;
}
string name_in;
cout<<"\nEnter Name from above list to call : ";
cin>>name_in;
long long int number_in=0;
for (int i=0; i<Phonebook.size(); i++)
{
if(Phonebook[i].first==name_in)
   number_in=Phonebook[i].second;
}
if(number_in!=0)
   Landline:call(number_in);
else
       cout<<"name is not there in phonebook !"<<endl;  
}
long long int Mobile::getNumberForName(string name_in){
   long long int num=0;
   return num;
}
void Mobile::init_Phonebook(vector< pair<string,long long int> > vec_in){
   Phonebook=vec_in;
}
void Mobile::update_dailed_numbers(){
  
}
void Mobile::call_from_dailed_numbers(){
   long long int number_new_in;
   int index_in;
   if(dailed_count==0){
       cout<<"there are no dailed numbers.."<<endl;
       cout<<"Enter number you want to call: ";
       cin>>number_new_in;
   }
   else{
       cout<<" list of Dailed numbers : "<<endl;
       int i=0;
       for(i=0;i<dailed_count;i++){
           cout<<i+1<<") "<<dailed_numbers[i]<<endl;
       }
       cout<<"Enter your choice : ";
       cin>>index_in;
       //Landline:call(dailed_numbers[index_in-1]);
       number_new_in=dailed_numbers[index_in-1];
   }
   Landline:call(number_new_in);
   if(dailed_count<20){
       dailed_numbers[dailed_count]=number_new_in;
       dailed_count++;
   }
   else if(dailed_count=20){
       dailed_numbers[0]=dailed_numbers[index_in-1];
   }
}
int main(){
   //creating a vector for storing names and numbers
   vector< pair<string,long long int> > Phonebook_vector;
// initialising 1st and 2nd element of
// pairs with array values
string names[] = {"name1","name2","name3","name4","name5","name6","name7","name8","name9","name10","name11","name12" ,"name13" ,"name14", "name15","name16", "name17","name18","name19","name20"};
long long int numbers[] = {9999999991,9999999992,9999999993,9999999994,9999999995, 9999999996,9999999997,9999999998,9999999999,9999999910,9999999911,9999999912,9999999913,9999999914,9999999915,9999999916,9999999917,9999999918,9999999919,9999999920};
  
//calculating number of elements;
   int n = sizeof(names)/sizeof(names[0]);
  
// Entering values in vector of pairs(inserting)
for (int i=0; i<n; i++)
Phonebook_vector.push_back( make_pair(names[i],numbers[i]) );
  
   Mobile MobileObject("IronMan",1234567890);
   MobileObject.init_Phonebook(Phonebook_vector);
  
   //calling call_by_name functionality which first displays phonebook and take a string name to be called then calling call function
   MobileObject.call_by_name();
  
   //calling call_from_dailed_numbers functionality
   MobileObject.call_from_dailed_numbers();
  
   //calling again to check dailed_numbers updated or not
   MobileObject.call_from_dailed_numbers();
  
   return 0;
}