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 getArea that returns the area of the circle. The area is calculated as 3.14159 * radius * radius

Short Answer

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Question: Create a class named "Circle" with a private member variable called "radius", and add set() and get() functions to access the radius variable, and a getArea() function to calculate and return the area of the circle using the formula 3.14159 * radius * radius.

Step by step solution

Create the Circle class declaration

First, we need to create the declaration of the Circle class: ``` class Circle { // Declarations here }; ```

Add the private member variable 'radius'

Inside the Circle class declaration, declare a private member variable named 'radius' of type double: ``` class Circle { private: double radius; }; ```

Add set() and get() functions for radius

Now, let's add the set() and get() functions to access the radius variable. These functions should be declared as public members of the class: ``` class Circle { private: double radius; public: void setRadius(double r) { radius = r; } double getRadius() const { return radius; } }; ```

Add getArea() function to calculate the area

Finally, we'll add the getArea() function to the Circle class that calculates the area of the circle and returns it. The area will be calculated using the formula: 3.14159 * radius * radius. ``` class Circle { private: double radius; public: void setRadius(double r) { radius = r; } double getRadius() const { return radius; } double getArea() const { return 3.14159 * radius * radius; } }; ``` Now, we have a complete Circle class with a private member variable 'radius', and functions to set, get the radius, and calculate the area of the circle using the given formula.

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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 getArea that returns the area of the circle. The area is calculated as 3.14159 * radius * radius

Short Answer

Step by step solution

Create the Circle class declaration

Add the private member variable 'radius'

Add set() and get() functions for radius

Add getArea() function to calculate the area

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