Question

C++ Coding ****** Please read prompt carefully and include screenshots fro verification.

Start with a Person class, and create a multiset to hold pointers to person objects. Define the multiset with the comparePersons function object, so it will be sorted automatically by names of person. Define a half-dozen persons, put them in the multiset, and display its contents. Several of the persons should have the same name, to verify that multiset stores multiple object with the same key. Also allow the user to search a person object by the last name and the first name.

Answer 1

Code :

#include <iostream>
#include <algorithm>
#include <string>
#include <set>
using namespace std;

class person
{
private:
string lastName;
string firstName;
long phoneNumber;
public:
// default constructor
person() :lastName("blank"), firstName("blank"), phoneNumber(0L)
{ }
// 3-arg 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<person*, comparePersons> 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);

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

/* sort(multiPtrsPers.begin(), multiPtrsPers.end(), comparePersons());//compare persons

for_each(multiPtrsPers.begin(), multiPtrsPers.end(), displayPerson());//display persons
cout << endl;
*/
system("pause");
return 0;
} // end main()