// Helene Martin, CSE 142
// Computes two people's body mass index and 
// displays their weight status.

// Chapter 4 case study!

import java.util.*;  // for Scanner

public class BMICalculator2 {
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		printIntroduction();
		
		double bmi1 = getBMI(s);
		double bmi2 = getBMI(s);		

		printResults(bmi1, 1);
		printResults(bmi2, 2);
		
		System.out.println("Difference: " + Math.abs(bmi1 - bmi2));
	}
	
	// explains the program
	public static void printIntroduction() {
		System.out.println("This program reads in data for two people and");
		System.out.println("computes their body mass index (BMI)");
		System.out.println();	
	}
	
	// calculates bmi based on weight and height
	public static double bmiFor(double weight, double height) {
		return 703 * (weight / Math.pow(height, 2));
	}
	
	// gets a person's weight and height, returns their bmi
	public static double getBMI(Scanner s) {
		System.out.println("Enter next person's information");
		System.out.print("height (in inches): ");
		double height = s.nextDouble();
		System.out.print("weight (in pounds): ");		
		double weight = s.nextDouble();
	
		double bmi = bmiFor(weight, height);
		return bmi;
	}	
	
	// prints person's bmi to the console	
	public static void printResults(double bmi, int person) {
		System.out.println("Person " + person + " BMI = " + bmi);
		String result = weightClass(bmi);	
		System.out.println(result);
	}
	
	// converts bmi to a weight class
	public static String weightClass(double bmi) {
		if(bmi < 18.5) {
			return "underweight";
		} else if(bmi < 25) {
			return "normal";
		} else if(bmi < 30) {
			return "overweight";
		} else {
			return "obese";
		}
	}	
}