Answer to Question #272342 in C++ for Imran

Question

Write a class LocalPhone that contains an attribute phone to store a local telephone

number. The class contains member functions to input and display phone number.

Write a child class NatPhone for national phone numbers that inherits LocPhone

class. It additionally contains an attribute to store city code. It also contains member

functions to input and show the city code. Write another class IntPhone for

international phone numbers that inherit NatPhone class. It additionally contains an

attribute to store country code. It also contains member functions to input and show

the country code. Test these classes from main() by creating objects of derived

classes and testing functions in a way that clear concept of multi-level Inheritance

Answer 1

#include<iostream>
#include<string>

using namespace std;

//function to check numbers of phone
bool IsPhone(string Phone)
{
	for(int i=0;i<Phone.size();i++)
	{
		if(!isdigit(Phone[i]))
		{
			cout<<"Incorrect phone!\n";
			return false;
		}
	}
	return true;	
}

class LocPhone
{
	string phone;
public:
	void InputPhone()
	{
		//Suppose, that local phone must have 6 digits
		do
		{
			cout<<"Please, enter a local telephone number with 6 digits: ";
			cin>>phone;	
		}while(phone.size()!=6||!IsPhone(phone));		
	}
	void DisplayPhone()
	{
		cout<<phone;
	}
};

class NatPhone:public LocPhone
{
	string cityCode;
public:
	void InputCityCode()
	{
		//Suppose, that national phone must have 4 digits
		do
		{
			cout<<"Please, enter a national city code with 4 digits: ";
			cin>>cityCode;	
		}while(cityCode.size()!=4||!IsPhone(cityCode));		
	}
	void DisplayCityCode()
	{
		cout<<cityCode;
	}
};

class IntPhone:public NatPhone
{
	string countCode;
public:
	void InputCountCode()
	{
		//Suppose, that international phone must have 3 digits
		do
		{
			cout<<"Please, enter an international country code with 3 digits: ";
			cin>>countCode;	
		}while(countCode.size()!=3||!IsPhone(countCode));		
	}
	void DisplayCountCode()
	{
		cout<<countCode;
	}
};

int main()
{
	LocPhone l;
	l.InputPhone();
	cout<<"Your local phone: ";
	l.DisplayPhone();
	cout<<endl;
	
	NatPhone n;
	n.InputPhone();
	n.InputCityCode();
	cout<<"Your national phone: ";
	n.DisplayCityCode();
	n.DisplayPhone();
	cout<<endl;
	
	IntPhone i;
	i.InputPhone();
	i.InputCityCode();
	i.InputCountCode();
	cout<<"Your international phone: ";
	i.DisplayCountCode();
	i.DisplayCityCode();
	i.DisplayPhone();	
}