Use C++: In the main function use the given multiset to display an unsorted list of people by making half of the list user-input and display the remaining of the list in an unsorted manner. Display an unsorted list of people.

#include

#include

#include

#include

using namespace std;

class person {

private:

string lastName;

string firstName;

long phoneNumber;

public:

// default constructor

person() :lastName("blank"), firstName("blank"), phoneNumber(0L)

{ }

// 3-argument constructor

person(string lana, string fina, long pho) :

lastName(lana), firstName(fina), phoneNumber(pho)

{ }

friend bool operator<(const person&, const person&);

friend bool operator==(const person&, const person&);

void display() const // display person's data

{

cout << endl << lastName << ",\t" << firstName

<< "\t\tPhone: " << phoneNumber;

}

long get_phone() const // return phone number

{

return phoneNumber;

}

}; // end class person

// overloaded < for person class

bool operator<(const person& p1, const person& p2)

{

if (p1.lastName == p2.lastName)

return (p1.firstName < p2.firstName) ? true : false;

return (p1.lastName < p2.lastName) ? true : false;

}

// overloaded == for person class

bool operator==(const person& p1, const person& p2)

{

return (p1.lastName == p2.lastName &&

p1.firstName == p2.firstName) ? true : false;

}

// function object to compare persons using pointers

class comparePersons

{

public:

bool operator() (const person* ptrP1, const person* ptrP2) const

{

return *ptrP1 < *ptrP2;

}

};

// function object to display a person, using a pointer

class displayPerson

{

public:

void operator() (const person* ptrP) const

{

ptrP->display();

}

};

int main()

{

// make persons

person* ptrP1 = new person("KuangThu", "Bruce", 4157300);

person* ptrP2 = new person("Deauville", "William", 8435150);

person* ptrP3 = new person("Wellington", "John", 9207404);

person* ptrP4 = new person("Bartoski", "Peter", 6946473);

person* ptrP5 = new person("Fredericks", "Roger", 7049982);

person* ptrP6 = new person("McDonald", "Stacey", 7764987);

person* ptrP7 = new person("KuangThu", "Bruce", 4157300);

person* ptrP8 = new person("Deauville", "William", 8435150);

// Creating multiset

multiset multiPtrsPers;

multiPtrsPers.insert(ptrP1);

multiPtrsPers.insert(ptrP2);

multiPtrsPers.insert(ptrP3);

multiPtrsPers.insert(ptrP4);

multiPtrsPers.insert(ptrP5);

multiPtrsPers.insert(ptrP6);

multiPtrsPers.insert(ptrP7);

multiPtrsPers.insert(ptrP8);

// Display an unsorted list

cout << " Unsorted: ";

cout << " Sorted: ";

for_each(multiPtrsPers.begin(),multiPtrsPers.end(), displayPerson()); //display person

cout << endl;

system("pause");

return 0;

} // end main()