// Allison Obourn, CSE 142
// This structured program computes two people's body mass index and 
// displays their weight status.

import java.util.*; 

public class BMICalculator {
	public static void main(String[] args) {
	
		intro();
		Scanner console = new Scanner(System.in);

		double bmi = processPerson(console);
		double bmi2 = processPerson(console);
		
		displayResults(bmi, bmi2);
	}
	
	// prints each person's bmi and weight class
	public static void displayResults(double bmi, double bmi2) {
		System.out.println("Person 1 BMI = " + bmi);
		printCategory(bmi);
		
		System.out.println("Person 2 BMI = " + bmi2);
		printCategory(bmi2);
	}
	
	// prints an introduction for the program.
	public static void intro() {
		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 and returns the bmi class based on a 
	// chart published by the Centers for Disease Control and Prevention
	public static void printCategory(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");
		}
	}
	
	// prompts for height and weight, calculates and returns 
	// body mass index
	public static double processPerson(Scanner console) {
		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 = bmi(height, weight);
		System.out.println();
		return bmi;
	}
	
	// calculates and returns body mass index based on weight and height
	public static double bmi(double height, double weight) {
		return weight / Math.pow(height, 2) * 703;
	}
}