Chapter 2 Question 2.14, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

(Health application: computing BMI) Body Mass Index (BMI) is a measure of health on weight. It can be calculated by taking your weight in kilograms and dividing by the square of your height in meters. Write a program that prompts the user to enter a weight in pounds and height in inches and displays the BMI. Note that one pound is 0.45359237 kilograms and one inch is 0.0254 meters.

Solution

import java.util.Scanner;

public class Exercise_02_14 {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        final double KILOGRAMS_PER_POUND = 0.45359237;

        final double METERS_PER_INCH = 0.0254;

        // Prompt the user to enter a weight in pounds

        System.out.print("Enter weight in pounds: ");

        double weight = input.nextDouble();

        // Prompt the user to enter height in inches

        System.out.print("Enter height in inches: ");

        double height = input.nextDouble();

        // Convert weight to kilograms

        weight = weight * KILOGRAMS_PER_POUND;

        // Convert height to meters

        height = height * METERS_PER_INCH;

        // Compute BMI

        double bodyMassIndex = weight / Math.pow(height, 2);

        // Display result

        System.out.println("BMI is " + bodyMassIndex);

    }

}