Odd rounding has me confused in the second Java practice problem

Question

I'm not sure if I missed something in the modules about rounding, but this has really got me stumped. In the challenge for module 2, I set up a simple loop for the loan calculator, but my result is always off by 1. Sometimes it's above, and apparently sometimes it isn't.
What I *think* is happening is that they're using rounded numbers, because I can see in their example problem that one of the numbers is rounded. But I don't think I was ever shown how to do that? It's not mentioned anywhere that I should round. I tried it a couple ways with the help of a friend, but those didn't fix all of the test cases, only some (I dont have pro so I cant tell what was wrong)

Can anyone nudge me in the right direction here? Is there something I missed that I could review? I'll see if I can post my current code in the comments or something

Answer 1

If you observe the sample, then it says need to round up the amount.
so Use
int paid = Math.ceil(owed/10.0);

Answer 2

Jayakrishna🇮🇳 I copied all of the text from the challenge's page into a reply here, there is absolutely nothing about needing to round up, except for the month 6 example where they don't point it out and don't explain how they did it. As a note, I'm on mobile, but I think I checked on desktop too and it was the same.

At this point in the course, they've only explained basic variable types, basic operator types, and flow control. I definitely haven't seen Math.ceil() before, so I was pretty lost. Thank you very much, I'll give that a try!

Answer 3

Uh oh, now it's complaining about lossy conversion between doubles and ints, but they also have not shown me how to convert between types. I wonder if this challenge ended up out of order somehow? I shouldn't have to be googling so much to complete these lol
Hmm...

Answer 4

//I know this is kind of janky, I just want to understand what the rounding issue is

import java.util.Scanner;

public class Program
{
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int amount = scanner.nextInt();
//your code goes here

int owed = amount;

for (int month = 0; month < 6; month++)
{
int paid = owed / 10;
owed -= paid;
}

System.out.println(owed);

}
}

Answer 5

"You take a loan from a friend and need to calculate how much you will owe him after 6 months.
You are going to pay him back 10% of the remaining loan amount each month.
Create a program that takes the loan amount as input, calculates and outputs the remaining amount after 6 months.

Sample Input:
20000

Sample Output:
10628

Here is the monthly payment schedule:
Month 1
Payment: 10% of 20000 = 2000
Remaining amount: 18000
Month 2
Payment: 10% of 18000 = 1800
Remaining amount: 16200
Month 3:
Payment: 10% of 16200 = 1620
Remaining amount: 14580
Month 4:
Payment: 10% of 14580 = 1458
Remaining amount: 13122
Month 5:
Payment: 10% of 13122 = 1313
Remaining amount: 11809
Month 6:
Payment: 10% of 11809 = 1181
Remaining amount: 10628

Use a loop to calculate the payment and remaining amounts for each month.
Also, use integers for amounts."