fn main() {
    let weight = 70.0_f32;
    let height = 1.75_f32;
    let bmi = medicallib_rust::calculate_bmi(weight, height).expect("valid inputs");
    let class = medicallib_rust::classify_bmi(bmi);
    println!("BMI: {:.2} kg/m^2 — {:?}", bmi, class);
}