Calculates Body Mass Index and weight category from height and weight.
Body Mass Index (BMI) is a screening number calculated from height and weight that indicates whether a person is in a healthy weight range for their height.
BMI = weight (kg) / height (m)² Categories: < 18.5 Underweight | 18.5–24.9 Normal | 25–29.9 Overweight | ≥ 30 Obese
Weight 78 kg, height 1.75 m. BMI = 78 / (1.75²) = 78 / 3.0625 ≈ 25.5 → Overweight category.
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