Exercise 2.20

//Exercise 2.20
//This program accepts a radius of a circle and prints the diameter, circumference, and area
#include <iostream>
using namespace std;


int main(){
    int radius{};
    cout << "Please input the radius of your circle: " << endl;
    cin >> radius;
    cout << "Diameter is " << radius * 2 << endl;
    cout << "Circumference is " << 2 * 3.14159 * radius << endl;
    cout << "Area is " << 3.14159 * radius * radius << endl;

}