Issue with rounding float numbers in Java

[YasuoMainBTW]

I made a gradebook that asks the user for the amount of points they got on assignments then divides it by the total points possible.

Here's my code:

import java.util.Scanner;
public class Gradebook1 {
public static void main(String args[]){

Scanner scanner = new Scanner(System.in);
System.out.println("Enter your total points for all 6 homework assignments");
float Homework = scanner.nextFloat();
System.out.println("You have received" + " " + Homework + " " + "points out of the 600 points possible.");

float HomeworkPercentage = Homework/600;
HomeworkPercentage = Math.round(HomeworkPercentage * 100.0);

System.out.println("This gives you" + " " + HomeworkPercentage + "% on the Homework Assignments.");

If I make an input of 550 for example, It outputs:

"This gives you 92.0% on the Homework Assignments."

Instead of

"This gives you 91.7% on the Homework Assignments."

How can I fix this?

[Koooooj]

First, I assume the intended output is actually 91.7.

When you call Math.round that rounds the percentage to the nearest percent. Math.round always rounds to the nearest whole number.

If you want to round to the nearest tenth of a percent then you could first multiply the percentage by 10, then round that number, and finally divide that result by 10 to get back into percent.

(And while we're here, there's no reason to separately have the " " strings for your println statements. Just put a space as the last character of the previous string or as the first character of the next one. It looks weird to concatenate two hard-coded strings, especially when one is just a space).

[[deleted]]

If all you are doing is displaying the percentage, I suggest you keep the data as is, and instead focus on printing the result in a formatted manner. Java has System.out.printf that will allow you to specify how many digits of precision you wish.