javaLogic errorMedium

BigDecimal divide without rounding mode throws exception

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What it should do

Divide 100 by 3 with 2 decimal places. Example: calculateExactShare(100, 3) -> "33.33"

What happens instead

java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result

import java.math.BigDecimal;

public class Main {
    public static String calculateExactShare(int total, int divisor) {
        BigDecimal a = BigDecimal.valueOf(total);
        BigDecimal b = BigDecimal.valueOf(divisor);
        // Dividing 100 by 3 has non-terminating decimal (33.333...); throws ArithmeticException without scale/rounding
        return a.divide(b).toString();
    }

    public static void main(String[] args) {
        System.out.println(calculateExactShare(100, 3));
    }
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

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This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

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import java.math.BigDecimal; public class Main { public static String calculateExactShare(int total, int divisor) { BigDecimal a = BigDecimal.valueOf(total); BigDecimal b = BigDecimal.valueOf(divisor); // Dividing 100 by 3 has non-terminating decimal (33.333...); throws ArithmeticException without scale/rounding return a.divide(b).toString(); } public static void main(String[] args) { System.out.println(calculateExactShare(100, 3)); } }

BigDecimal divide without rounding mode throws exception

What it should do

What happens instead

More logic errors to practise

BigDecimal divide without rounding mode throws exception

What it should do

What happens instead

More logic errors to practise