Question

Write a complete C++ program in one file here that asks the user to enter a radius for a circle then calculates and prints its' area. The area should be calculated using the formula area = 3.14 * radius * radius. You must have a class called Circle that stores the radius as a double value and can calculate its' own area via a method called calcArea that takes no parameters and returns the area

Answer 1

#include <iostream>

using namespace std;

class Circle{

public:

double radius;

Circle(double r) {

radius = r;

}

double calcArea() {

return 3.14 * radius * radius;

}

};

int main()

{

double radius;

cout<<"Enter the radius: ";

cin >> radius;

Circle ob = Circle(radius);

cout << ob.calcArea() << endl;

return 0;

}

Step-by-step explanation:

Create a class called Circle that has one variable, radius

Create a constructor that takes one parameter, radius

Create a method called calcArea that calculates and returns the area of a circle using given formula

In the main:

Ask the user for the radius

Create an object for Circle with given radius

Call calcArea method to calculate the area, and print the result