Related questions with answers

Write a Circle class that has the following member variables: - radius: a double - pi: a double initialized with the value 3.14159 The class should have the following member functions: - Default Constructor. A default constructor that sets radius to 0.0. - Constructor. Accepts the radius of the circle as an argument. - setRadius. A mutator function for the radius variable. - getRadius. An accessor function for the radius variable. - getArea. Returns the area of the circle, which is calculated as area = pi * radius * radius - getDiameter. Returns the diameter of the circle, which is calculated as diameter = radius * 2 - getCircumference. Returns the circumference of the circle, which is calculated as - circumference = 2 * pi * radius Write a program that demonstrates the Circle class by asking the user for the circle’s radius, creating a Circle object, and then reporting the circle’s area, diameter, and circumference.

Write a function that searches a numeric array for a specified value. The function should return the subscript of the element containing the value if it is found in the array. If the value is not found, the function should throw an exception.

Write the declaration for class B. The class’s members should be - m, an integer. This variable should not be accessible to code outside the class or to member functions in any class derived from class B. - n, an integer. This variable should not be accessible to code outside the class, but should be accessible to member functions in any class derived from class B. - setM, getM, setN, and getN. These are the set and get functions for the member variables m and n. These functions should be accessible to code outside the class. - calc, a public virtual member function that returns the value of m times n. Next write the declaration for class D, which is derived from class B. The class’s members should be - q, a float. This variable should not be accessible to code outside the class but should be accessible to member functions in any class derived from class D. - r, a float. This variable should not be accessible to code outside the class, but should be accessible to member functions in any class derived from class D - setQ, getQ, setR, and getR. These are the set and get functions for the member variables q and r. These functions should be accessible to code outside the class. - calc, a public member function that overrides the base class calc function. This function should return the value of q times r.

Question

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

Solutions

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Solution A

Solution B

Answered 3 months ago

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class Circle{
private:
    double radius;
    
public:
    //function to get radius
    //it is declared const because it
    //will not change the calling object
    //in any manner
    double getRadius() const{
        return radius;
    }
    
    //function to set radius
    //accepts an argument of type double
    //and sets it to the radius member
    void setRadius(double r){
        radius = r;
    }
    
    //function to get area
    //declared const for the same reasons
    //as above
    double getArea() const{
        return 3.14159 * radius * radius;
    }
};