What is a java BMI calculator?

I'll go through your code from top to bottom for a better understanding of the java BMI calculator:

//import scanner

import java.util.Scanner;

The comment "import scanner" is not necessary, since it only repeats what the code below already does.

//import Maths class

import java.lang.Math;

This import can be removed completely, since all classes from java.lang are imported implicitly.

public class ComputeBMI {

    public static void main(String[] args) {

        // TODO Auto-generated method stub

This "TODO" comment is something you have to remove. It makes your code look sloppy, as if you didn't proofread it yourself before showing it to other people.

        //create scanner

        Scanner input = new Scanner(System.in);

As a beginner, you may need these kinds of comments, but as soon as you have written this type of code five times, you should get rid of these comments.

        //declare variables

        double weight;

        int feet;

        int inches;

In Java, it is good practice to declare variables as late as possible, that is when they are first used.

        //prompt user

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

        weight = input.nextFloat();

This line should declare the weight variable: double weight = input.nextDouble();. I changed the method call to nextDouble so that it matches the type of the height variable.

        System.out.print("Enter feet: ");

        feet = input.nextInt();
        System.out.print("Enter inches: ");
        inches = input.nextInt();
        //convert measurements
        double weightInKilos = weight * 0.453592;
        double heightInMeters = (((feet * 12) + inches) * .0254);
        double bmi = weightInKilos / Math.pow(heightInMeters, 2.0);
//      double bmi = weightInKilos / (heightInMeters * heightInMeters);

You chose excellent names for your variables. When dealing with different measurement units, each variable should mention the unit, which you did here.

        //display output

        System.out.println("Your BMI is: " + bmi);
        //interpret BMI
        if (bmi < 18>= 18.5 && bmi < 25>

else if (bmi >= 25 && bmi < 30>= 30) {
            System.out.print("Obese");
        }
//      Do I need this last else if there?
//      else {
//          System.out.print("");
//      }

No, you don't need the last else if. You can just write } else { System.out.println("Obese"); }.


Note the println instead of print. When printing something, you usually print it in lines. Each line should be terminated properly, which you do with println. The ln in println stands for line break.


        input.close();


    }


}


Altogether, a very nice piece of work. The many comments tell the reader that you are a beginner, but don't worry, in a few weeks you can remove them and still understand the program equally well.