// This program finds the body mass index (BMI) for two individuals.  This
// variation includes several methods other than method main.

import java.util.*;

public class BMI {
    public static void main(String[] args) {
        giveIntro();
        Scanner console = new Scanner(System.in);
        double bmi1 = getBMI(console);
        double bmi2 = getBMI(console);
        reportResults(bmi1, bmi2);
    }

    // introduces the program to the user
    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 getBMI(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 = BMIFor(height, weight);
        System.out.println();
        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 BMIFor(double height, double weight) {
        return weight / (height * height) * 703;
    }

    // reports the overall bmi values and weight status to the user
    public static void reportResults(double bmi1, double bmi2) {
        System.out.println("Person #1 body mass index = " + round1(bmi1));
        System.out.println(status(bmi1));
        System.out.println("Person #2 body mass index = " + round1(bmi2));
        System.out.println(status(bmi2));
    }

    // returns a string for the weight status for the given bmi value
    public static String status(double bmi) {
        if (bmi < 18.5) {
            return "underweight";
        } else if (bmi < 25) {
            return "normal";
        } else if (bmi < 30) {
            return "overweight";
        } else {  // (bmi >= 30)
            return "obese";
        }
    }

    // rounds n to 1 digits after the decimal point
    public static double round1(double n) {
        return Math.round(n * 10.0) / 10.0;
    }
}