Question

JAVA CODE BEGINNER , Please use comments to explain, please

Repeat the calorie-counting program described in Programming Project 8 from Chapter 2. This time ask the user to input the string “M” if the user is a man and “W” if the user is a woman. Use only the male formula to calculate calories if “M” is entered and use only the female formula to calculate calories if “W” is entered. Output the number of chocolate bars to consume as before.

and this project 8:

The Harris-Benedict equation estimates the number of calories your body needs to maintain your weight if you do no exercise. This is called your basal metabolic rate, or BMR.

The calories needed for a woman to maintain her weight is:

BMR = 655 + (4.3 × weight in pounds) + (4.7 × height in inches) − (4.7× age in years)

The calories needed for a man to maintain his weight is:

BMR = 66 + (6.3 × weight in pounds) + (12.9 × height in inches) − (6.8 × age in years)

A typical chocolate bar will contain around 230 calories. Write a program that allows the user to input his or her weight in pounds, height in inches, and age in years. The program should then output the number of chocolate bars that should be consumed to maintain one’s weight for both a woman and a man of the input weight, height, and age.

Answer 1

Java Code :

import java.util.Scanner;           // for using Scanner class
public class Solution
{
    public static void main(String args[])
    {
        Scanner obj = new Scanner(System.in);           // Creating Scanner class object
      
       System.out.print("\nInput the String : ");           // Asking for the input of the String
        String s = obj.next();               // taking input of String
      
       System.out.println();
      
       double BMR = 0.0;           // it will store the value of BMR
        if(s.equals("W"))           // if the input String is "W", then we'll go with Woman
        {
            System.out.print("\nEnter the weight in pounds for woman : ");           // Asking for the input of weight in pounds for woman
            double weight = obj.nextDouble();               // taking input of weight in pounds for woman
            System.out.print("\nEnter the height in inches for woman : ");           // Asking for the input of height in inches for woman
            int height = obj.nextInt();               // taking input of height in inches for woman
            System.out.print("\nEnter the age in years for woman : ");           // Asking for the input of age in years for woman
            int age = obj.nextInt();               // taking input of age in years for woman
          
            BMR = 655 + (4.3 * weight) + (4.7 * height) - (4.7 * age);           // Calculating BMR for woman
        }
        else if(s.equals("M"))           // if the input String is "M", then we'll go with Man
        {
            System.out.print("\nEnter the weight in pounds for man : ");           // Asking for the input of weight in pounds for man
            double weight = obj.nextDouble();               // taking input of weight in pounds for man
            System.out.print("\nEnter the height in inches for man : ");           // Asking for the input of height in inches for man
            int height = obj.nextInt();               // taking input of height in inches for man
            System.out.print("\nEnter the age in years for man : ");           // Asking for the input of age in years for man
            int age = obj.nextInt();               // taking input of age in years for man
          
            BMR = 66 + (6.3 * weight) + (12.9 * height) - (6.8 * age);           // Calculating BMR for man
        }
      
        double choc = BMR / 230.0;               // Calculating number of chocolate bars required
        int chocolates = Math.round((float)choc);       // Rounding off the double value of number of chocolate bars required for getting exact number of chocolates
      
        System.out.print("\n\nThe number of chocolate bars that should be consumed : " + chocolates + "\n\n" );           // printing number of chocolate bars
    }
}

Java Code Output :