double calculateCircumference(double radius) {return 2 M_PI radius;}
double calculateArea(double radius) {return M_PI * pow(radius, 2);}
int main() {double radius;std::cout << "Enter the radius of the circle: ";std::cin >> radius;
}
double calculateCircumference(double radius) {
return 2 M_PI radius;
}
double calculateArea(double radius) {
return M_PI * pow(radius, 2);
}
int main() {
double circumference = calculateCircumference(radius);double radius;
std::cout << "Enter the radius of the circle: ";
std::cin >> radius;
double area = calculateArea(radius);
std::cout << "Circumference of the circle: " << circumference << std::endl;
std::cout << "Area of the circle: " << area << std::endl;
return 0;
}