// Zorah Fung, CSE 142
// This program computes two people's body mass index (BMI) and
// compares them.
import java.util.*;  // to use the Scanner

public class BMICalculator {
   public static void main(String[] args) {
      // Note: Our goal is to make main a summary of our program
      intro();
      
      Scanner console = new Scanner(System.in);
      
      double bmi1 = calculateBMI(console);
      double bmi2 = calculateBMI(console);
      
      printResults(bmi1, bmi2);

   }
   
   // Prints out the introduction
   public static void intro() {
      // Note: We make this a method so that main is a concise summary.
      // The details (text) of the intro are not important enough to keep
      // in main
      System.out.println("This program reads in data for two people and");
      System.out.println("computes their body mass index (BMI)");
      System.out.println();
   }
   
   // Prompts the user for their weight and height and returns the BMI
   // based on these weight and height
   public static double calculateBMI(Scanner console) {
      // Note: This method both reduces redundancy -- we do this for two people --
      // and adds structure to our program -- calculating the BMI is a single, important
      // task in our program
      System.out.println("Enter next person's information:");
      System.out.print("height (in inches)? ");
      double height = console.nextDouble();
      System.out.print("weight (in pounds)? ");
      double weight = console.nextDouble();
      
      double bmi = bmiFor(height, weight);
      return bmi;
   }
   
   // Returns the BMI for the given height and weight
   public static double bmiFor(double height, double weight) {
      return weight / (height * height) * 703;
   }
   
   // Prints the weight class for the given BMI
   public static void printStatus(double bmi) {
      // Note: This method both reduces redundancy -- we do this for two people --
      // and adds structure to our program -- determining the weight class is a single,
      // important task in our program
      if (bmi < 18.5) {
         System.out.println("underweight");
      } else if (bmi < 25) {
         System.out.println("normal");
      } else if (bmi < 30) {
         System.out.println("overweight");
      } else {
         System.out.println("obese");
      }
   }
   
   // Prints the weight class pf and difference between the two given BMIs.
   public static void printResults(double bmi1, double bmi2) {
      System.out.println("Person 1 BMI " + bmi1);
      printStatus(bmi1);
      System.out.println("Person 2 BMI " + bmi2);
      printStatus(bmi2);
      System.out.println("Difference = " + Math.abs(bmi1 - bmi2));
   }
}