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Wed, 22 July 2015 19:14

Eclipse User

I could use some help on this please!

Fat Gram calculator

Design a program that asks for the number of fat grams and calories in a food item. Validate the input as follows:

- Make sure the number of fat grams and calories are not less than 0.
- According to nutritional formulats, the number of calories cannot exceed fat grams * 9. Make sure the number of calories entered is not greater than fat grams * 9.

Once correct data has been entered, the program should calculate and display the percentage of calories that come from fat. Use the following formula: Percentage of calories from fat = (Fat grams * 9) / calories.

Some nutritionists classify a food as "low fat" if less than 30 percent of its calories come from fat. If the results of this formula are less than 0.3, the program should display a message indicating the food is low in fat.

Seems I am having issues with the while statement or I have this all wrong. I would truly appreciate some suggestions, troubleshooting steps, and resolution to this problem. Please see file attached.

Attachment: PercentCalFat3.class
(Size: 1.84KB, Downloaded 113 times)

Re: Eclipse project help [message #1702531 is a reply to message #1702529]

Wed, 22 July 2015 19:19

Eclipse User

This forum is to help you get Eclipse running. You'll need your fellow students, javaranch.com, or stackoverflow.com for purely Java questions. And I'd suggest attaching source rather than a compiled class at that time.

Re: Eclipse project help [message #1702532 is a reply to message #1702529]

Wed, 22 July 2015 19:22

Eclipse User

import java.util.Scanner;

public class PercentCalFat3 {

public static void main(String[] args)
{
//Create scanner for keyboard input
Scanner keyboard = new Scanner(System.in);

//Local variables
String doAnother;

do
{
//Calculate and display item fat grams and calories
showPercentage();

//Do this again?
System.out.print("Do you have another item? (Enter y for yes): ");
doAnother = keyboard.next();
}while (doAnother.equals("y") || doAnother.equals("Y"));
}

//The Percentage module gets an items % of calories from fat
//from the user and diplsys its percentage.
public static void showPercentage()
{

//Create a Scanner object for keyboard input.
Scanner keyboard = new Scanner (System.in);

//Local Variables
double fatGrams, calories, percent;

//Ask user to enter amount of fat grams.
System.out.print("Enter the amount of fat grams: ");
fatGrams = keyboard.nextDouble();

//Validate fat grams
{while (fatGrams * 9 < 0)
{
System.out.println("fat grams cannot be less than 0");
System.out.print("Enter the correct amount of fatGrams: ");
fatGrams = keyboard.nextDouble();
}}
//Ask user to enter amount of calories.
System.out.print("Enter the amount of calories: ");
calories = keyboard.nextDouble();

//Validate calories
while (calories > 0 || calories < fatGrams * 9);
{
System.out.println("calories cannot be less than 0");
System.out.println("or greater than fat grams. ");
System.out.print("Enter the correct amount of calories: ");
calories = keyboard.nextDouble();

//Calculate the percentage of calories from fat.
percent = (fatGrams * 9) / calories;

//Display the percent.
System.out.println("The percent of calories is " + percent);
{
while (percent <.03);
//Display this food is low fat if
// less than 30 percent of calories
//come from fat.

System.out.println("This item is low fat");

{

}
}

}
}
}

Re: Eclipse project help [message #1702533 is a reply to message #1702531]

Wed, 22 July 2015 19:23

Eclipse User

thank you!

Re: Eclipse project help [message #1702785 is a reply to message #1702531]

Fri, 24 July 2015 10:34

Eclipse User

Nitin Dahyabhai wrote on Wed, 22 July 2015 23:19

This forum is to help you get Eclipse running. You'll need your fellow students, javaranch.com, or stackoverflow.com for purely Java questions.

You did read that, right?

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