One percent discount doesn't work. How do I round this issue down?

Question

Good day, I make a method with a discount on the number but the one percent discount does not work . Problem with rounding numbers ?

Waiting: price 65.

Reality: price 66.

CODE:

public class Main {
    public static void main(String[] args) {
        int discount = 1;
        int price = 66;
        price -= (int) (discount * (price / 100));
        System.out.println(price);
    }
}

Please tell me how to round it down ?

SOLUTION:

public class Main {
    public static void main(String[] args) {
        int discount = 1;
        int price = 66;


        double amountOfDiscount = (discount * (price / 100.0f));
        double priceWithDiscountDoubleType = (price - amountOfDiscount);
        int priceWithDiscount = (int) 
        Math.floor(priceWithDiscountDoubleType);

        System.out.println(priceWithDiscount);

    }
}

score 1 · Accepted Answer · answered Mar 16 '20 at 10:04

1

It is because you're using int to store the prices etc. Try using floating point numbers like float or double

answered Mar 16 '20 at 10:04

Fred

220
2
8

1

Float/double for currency is as bad as integer. After a few operations you would end up with some cents missing. One should use BigInteger/BigDecimal for that. – Amongalen Mar 16 '20 at 10:17

One percent discount doesn't work. How do I round this issue down?

1 Answers1