Chapter 7.9, Problem 7.18CP

Explanation of Solution

Class Object:

• Objects are the instance of class, which contains the value to the variables declared in class and the member function work on these class objects.
• Class objects are passed as parameter or argument to the functions by reference or by value.
• With the use of class object, a public member function is accessed by the dot operator.

Example:

Consider an example of class object is as follows:

//include the required header files

#include <iostream>

using namespace std;

/*Class declaration*/

class First

{

/*Access Specifier*/

private:

/*Declare the variable "a1" as "int"*/

int a1;

/*Access Specifier*/

public:

/*Function definition for set()*/

void set(int value)

{

/*Assign the "value" to "a1"*/

a1 = value;

}

/*Function definition for "sum()"*/

First sum(First p, First q)

{

/* Create an object*/

First a1;

/*Add the two values*/

a1.set(p.a1 + q...