listing02.02.ComputeAreaWithConsoleInput.cpp

#include <iostream>
using namespace std;

int main() {
   
    //Step 1 : Read user input
    double radius;
    cout << "Enter a radius : ";
    cin >> radius;

    // Step 2: Compute area
    double area = radius * radius * 3.14159;

    // Step 3 : Display area
    cout << "The area is " << area << endl;

    return 0;
}