#include <stdbool.h>
#include <stdio.h>
#include <assert.h>

bool classify_person(void);
bool is_mass_valid(double mass);

/**
@brief Returns true if is a valid height for a human being
@details 
@code
   if ...
@endcode
@param height A real number in centimeters
@return True if height is suitable for a human being
*/
bool is_height_valid(double height);

/**
@param bmi Must be always positive
*/
const char* classify_body_mass_index(double bmi);

// procedure Main:
int main(void) {
  // While there is data then
  while (classify_person()) {
    // Classify person
  }
}

#include <stdint.h>

// procedure Classify person:
bool classify_person(void) {
  // Read mass in kilograms
  double mass = 0.0;
  // Read height in centimeters
  double height_in_cm = 0.0;
  if (scanf("%lg %lg", &mass, &height_in_cm) == 2) {
    // Print mass, height
    printf("%6.2lf %6.2lf ", mass, height_in_cm);
    // If is mass valid and is height in centimeters valid then
    if (is_mass_valid(mass) && is_height_valid(height_in_cm)) {
      // Create height in meters as height in centimeters / 100
      const double height_in_meters = height_in_cm / 100.0;
      // Create body mass index as mass / height in meters^2
      const double bmi = mass / (height_in_meters * height_in_meters);
      // Create nutrition state as the result of classifying the body mass index
      const char* const nutrition_state = classify_body_mass_index(bmi);
      // Print body mass index, nutrition state
      printf("%5.2lf %s\n", bmi, nutrition_state);
    } else {
      // Print "invalid data"
      printf("invalid data\n");
    }
    // Continue reading the next person
    return true;
  } else {
    // Stop, there is no more people
    return false;
  }
}

// function is mass valid:
bool is_mass_valid(double mass) {
  // Return mass > 0 and mass <= 1000
  return mass > 0 && mass <= 1000;
}

// function is height valid:
bool is_height_valid(double height) {
  // return height > 0 and height <= 300
  return height > 0 && height <= 300;
}

// function classify the body mass (bmi) index:
const char* classify_body_mass_index(double bmi) {
  // if bmi < 18.5 then
  if (bmi < 18.5) {
    return "underweight";
  }
  // if bmi < 25 then
  if (bmi < 25) {
    return "normal";
  }
  // if bmi < 30 then
  if (bmi < 30) {
    return "overweight";
  }
  return "obese";
}