example2_directives_declarations.cpp

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#include <iostream>

namespace Physics {
    const double G = 9.81;  // Acceleration due to gravity
    
    double calculateFallingDistance(double time) {
        return 0.5 * G * time * time;
    }
}

using namespace Physics;
using std::cout;
using std::endl;

int main() {
    double time = 3.0;  // seconds
    cout << "Distance fallen in " << time << " seconds: "
         << calculateFallingDistance(time) << " meters" << endl;
    return 0;
}