#define in cpp

#include <iostream>

#define PI 3.14159
#define SQUARE(x) (x*x)

int main() {
    double radius = 5.0;
    double area = PI * SQUARE(radius);

    std::cout << "Radius: " << radius << std::endl;
    std::cout << "Area: " << area << std::endl;

    return 0;
}