Member Avatar for mp9036 
/**
A programme which converts weight from pounds to kilograms and the height from inches to centimeters, 
then it calculates body mass index. 

@author 
*/

import java.util.Scanner;

public class BodyMassIndex

{
    public static void main(String[] args)
    {
        Scanner BMI = new Scanner(System.in);
        System.out.println(BMI.nextLine());

        double p, k, c, i, bmi;





        Scanner scan = new Scanner (System.in);

        System.out.print("How much do you weigh in pounds? ");
        p = scan.nextDouble();

        System.out.print("How much is your height in inches? ");
        i = scan.nextDouble();

        k = p / 2.2;                                                //calculates kilogrammes from pounds

        c = 2.54 * i;                                               //calculates centimeters from inches

        bmi = k / Math.pow(c/100,2);                                //calculates body mass index from the fomula given. 

        System.out.println("A person with weight "+p+" pounds and height "+i+" inches has Body Mass Index of:"+bmi+"") ;
    }


}

this is the code i wrote...

but the question asks me to evaluate the BMI as an integer...

if I try to name BMI as int, it gives me an error about precision...
anyone know how to solve this problem???

/**
A programme which converts weight from pounds to kilograms and the height from inches to centimeters, 
then it calculates body mass index. 

@author Dong Hyun Kim 0955303
*/

import java.util.Scanner;

public class BodyMassIndex

{
	public static void main(String[] args)
	{
		Scanner BMI = new Scanner(System.in);
		System.out.println(BMI.nextLine());
		
		double p, k, c, i, bmi;
		


		
		
		Scanner scan = new Scanner (System.in);
		
		System.out.print("How much do you weigh in pounds? ");
		p = scan.nextDouble();
		
		System.out.print("How much is your height in inches? ");
		i = scan.nextDouble();
		
		k = p / 2.2;												//calculates kilogrammes from pounds
		
		c = 2.54 * i;												//calculates centimeters from inches
		
		bmi = k / Math.pow(c/100,2);								//calculates body mass index from the fomula given. 
		
		System.out.println("A person with weight "+p+" pounds and height "+i+" inches has Body Mass Index of:"+bmi+"") ;
	}
	
		
}
Edited by Dani because: Formatting fixed
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  • Latest Post Latest Post by stultuske
Member Avatar for stultuske

it's because your other variables are doubles.
this basically means they accept decimal values, but an int doesn't.
so, in 0,03 * 1,25 = ...
you would get: 0 as result, because of just that, your precision levels are different, it's like converting a .png image to a .jpg, less colors possible, ...
just read it as a Double (not double) and use the intValue() method to get the value you're looking for.

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