Chapter 13: Problem 43

Write a class declaration named Circle with a private member variable named radius. Write set and get functions to access the radius variable, and a function named get Area that returns the area of the circle. The area is calculated as 3.14159 * radius * radius

Short Answer

Expert verified

Answer: The main purpose of the Circle class is to model a circle with a specified radius. It provides set and get functions to access the radius value and a function named getArea to calculate the area of the circle. The area of the circle is calculated using the formula 3.14159 * radius * radius in the getArea function.

Step by step solution

Declare Circle class

Declare a new class named 'Circle' using the class keyword. class Circle { // class members will go here };

Define private member variable

Inside the Circle class, define the private member variable named 'radius' with the appropriate data type (double). private: double radius;

Write set and get functions

Inside the Circle class, write the public functions named 'setRadius' and 'getRadius'. The setRadius function should take a double argument and set the radius to the given value. The getRadius function should return the radius value. public: void setRadius(double r) { radius = r; } double getRadius() { return radius; }

Write getArea function

Inside the Circle class, write the public function named 'getArea'. The getArea function should calculate the area of the circle using the formula 3.14159 * radius * radius and return the result. public: double getArea() { return 3.14159 * radius * radius; } Here's the complete Circle class declaration, following the steps above: ```cpp class Circle { private: double radius; public: void setRadius(double r) { radius = r; } double getRadius() { return radius; } double getArea() { return 3.14159 * radius * radius; } }; ```

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Write a class declaration named Circle with a private member variable named radius. Write set and get functions to access the radius variable, and a function named get Area that returns the area of the circle. The area is calculated as 3.14159 * radius * radius

Short Answer

Step by step solution

Declare Circle class

Define private member variable

Write set and get functions

Write getArea function

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