Loan calculator rounding error

Question

All variables are integers but it rounds the answer and does not match the output for the test. I do not understand why. With input of 100000 result for test is off by 1

https://code.sololearn.com/c0W9nDJExjMT/?ref=app

Answer 1

For this I used Math and rounded my answer after multiplying the remaining amount by 9/10... I hope this helps

https://code.sololearn.com/cDlJfxcG3v15/?ref=app

Answer 2

Use math.ceil() as recommended by challenge.
https://www.sololearn.com/discuss/2608182/?ref=app
https://www.sololearn.com/discuss/2605192/?ref=app

Answer 3

https://code.sololearn.com/cp6GXE4Rc84v/?ref=app

The reason why you get 54145 is because of Integer division. It ignores decimals (rounding down). Ultimately when you do a minus, you get an extra 1.

1: 100000 - 100000/10 = 90000
2: 90000 - 90000/10 = 81000
3: 81000 - 81000/10 = 72900
4: 72900 - 72900/10 = 65610
5: 65610 - 65610/10 = 59049
6: 59049 - 59049/10
= 59049 - 5904 (missing precision)
= 54145 (extra 1, expected 54144)

To bypass, you can do "amount = amount * 90 / 100".

Do not hard-code -1 or +1.

One good example will be 0. After 6 months, it will still be 0. By hard-coding -1, it results in -1 which is wrong.

Answer 4

I used the formula, it turned out pretty good

https://code.sololearn.com/ctEcLcYseT8O/?ref=app

Answer 5

import java.util.Scanner;

public class Program
{
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int amount = scanner.nextInt();
int loan;
//your code goes here
for(int i=1;i<=3;i++)
{
loan =amount/10;
amount-=loan;
}
System.out.println(amount);
}
}