Q.

Write function bmi that calculates body mass index (bmi = weight/height2).
if bmi <= 18.5 return "Underweight"
if bmi <= 25.0 return "Normal"
if bmi <= 30.0 return "Overweight"
if bmi > 30 return "Obese"

A)

const char *bmi (int weight, double height) {
  double bmi = weight / (height * height);
  if (bmi <= 18.5)
    return "Underweight";
  else if (bmi <= 25.0)
    return "Normal";
  else if (bmi <= 30.0)
    return "Overweight";
  else
    return "Obese";
}