Create two classes. The first, named Sale, holds data for a sales transaction. Its private data members include the day of the month, amount of the sale, and the salesperson's ID number. The second class, named Salesperson, holds data for a salesperson, and its private data members include each salesperson's ID number and last name. Each class includes a constructor to which you can pass the field values. Create a friend function named display () that is a friend of both classes and displays the date of sale, the amount, and the salesperson ID and name. Write a short main () demonstration program to test your classes and friend function. Sample Run

Sale #103 on 12/25/2016 for $559.95 sold by #103 Woods

Sale #106 on 11/15/2016 for $359.95 sold by #106 Hansen

A C+ + program was used in creating two classes. the code is stated below.

Explanation:

Solution

The C+ + program is executed below:

#include

using namespace std;

//declare class (will be define later)

class Salesperson;

//class Sale

class Sale

{

//private members of class

private:

string day;

double amtOfSale;

int salesPersonId;

//public methods

public:

//constructor that takes day, amount of sale and salesPersonId as parameters

Sale (string date, double sale, int id)

{

//set the private members to the initial values passed

day=date;

amtOfSale=sale;

salesPersonId=id;

}

//declare a friend function that takes objects of the two classes as parameters

friend void display (Sale, Salesperson);

};

//define class Salesperson

class Salesperson

{

//private members of the class

private:

int salesPersonId;

string lastName;

//public methods

public:

//constructor that takes name and id as parameters

Salesperson (int id, string name)

{

//set the members of the class with the parameters passed

salesPersonId=id;

lastName=name;

}

//declare a friend function that takes objects of the two classes as parameters

friend void display (Sale, Salesperson);

};

//define the friend funtion

void display (Sale saleObj, Salesperson personObj)

{

//display the sales info using the objects of the two classes

cout<<"/nSale #"<
}

int main ()

{

//create object for Sale class and pass default values

Sale sObj1 ("12/25/2016",559.95,103);

//create object for Salesperson class and pass default values

Salesperson pObj1 (103,"Woods");

//create another object for Sale class and pass default values

Sale sObj2 ("11/15/2016",359.95,106);

//create another object for Salesperson class and pass default values

Salesperson pObj2 (106,"Hansen");

//using the friend function dislay the sales info

display (sObj1, pObj1);

display (sObj2, pObj2);

return 0;

}