// This program computes 2 persons' body mass index (BMI).
// This larger example uses more parameters and returns.

import java.util.*;   // for Scanner

public class BMI2 {
    public static void main(String[] args) {
        giveIntro();
        
        Scanner console = new Scanner(System.in);
        double bmi1 = processPerson(console);
        double bmi2 = processPerson(console);

        System.out.println("Person #1 body mass index = " + bmi1);
        System.out.println("Person #2 body mass index = " + bmi2);
        System.out.println("difference = " + (bmi1 - bmi2));
    }
    
    public static void giveIntro() {
        System.out.println("This program reads in data for two people");
        System.out.println("and computes their body mass index (BMI)");
        System.out.println("and weight status.");
        System.out.println();
    }

    // prompts for one person's statistics, returning the BMI
    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();
        System.out.println();
        
        double bmi = getBMI(height, weight);
        return bmi;
    }

    // this method contains the body mass index formula for converting the
    // given height (in inches) and weight (in pounds) into a BMI
    public static double getBMI(double height, double weight) {
        double bmi = weight / (height * height) * 703;
        return bmi;
    }
}