// Helene Martin, CSE 142
// This program computes two people's body mass indexes and 
// displays their weight status.
// NOTE: this is the Chapter 4 case study

import java.util.*;  // for Scanner

public class BMICalculator {
	public static void main(String[] args) {
		printIntroduction();
		
		Scanner console = new Scanner(System.in);		
		
		double bmi = getBMI(console);
		double bmi2 = getBMI(console);
		
		printResults(bmi, bmi2);
	}
	
	// introduces 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();	
	}
	
	// prompts for a person's weight and height
	// returns that person's body mass index
	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(height, weight);
		System.out.println();
		return bmi;	
	}
	
	// calculates body mass index based on weight (lbs) and height (in)
	public static double bmiFor(double weight, double height) {
		return 703 * (weight / Math.pow(height, 2));
	}
	
	// prints each person's bmi and weight class
	public static void printResults(double bmi, double bmi2) {
		System.out.println("Person 1 BMI = " + bmi);
		printWeightClass(bmi);
		
		System.out.println("Person 2 BMI = " + bmi2);
		printWeightClass(bmi2);	
	}
	
	// prints a weight class based off a given bmi
	public static void printWeightClass(double bmi) {
		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");
		}	
	}
}