fn bmi(weight: u32, height: f32) -> &'static str {
  let bmi: f64 = (weight as f64) / (height as f64).powf(2.0);
  let result: &'static str =
      if bmi <= 18.5 { "Underweight" } else
      if bmi <= 25.0 { "Normal" } else
      if bmi <= 30.0 { "Overweight" } else
      if bmi > 30.0 { "Obese" } else
      { "default" };

  return result
}

#[test]
fn basic_unit_test() {
  assert_eq!(bmi(80, 1.80), "Normal");
}