The BigInteger class represents arbitrary-precision integers and does not support fractional or decimal values. Therefore, RoundingMode.HALF_UP and other rounding modes are not applicable to BigInteger operations directly.
However, you may still encounter an ArithmeticException in certain cases when converting or dividing with expectations of exact results, especially when the operation would require rounding, something BigInteger cannot perform.
Why ArithmeticException Occurs
BigIntegeris for whole numbers only ,no decimals or fractions.- If you try to perform division that does not yield an exact integer, and you use a method like
divide()which expects exact division, it throws anArithmeticException.
Common Scenario
import java.math.BigInteger;
public class BigIntegerDivisionExample {
public static void main(String[] args) {
BigInteger a = new BigInteger("10");
BigInteger b = new BigInteger("3");
// This throws ArithmeticException because 10 is not evenly divisible by 3
BigInteger result = a.divide(b);
System.out.println(result);
}
}
/*
Exception in thread "main" java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.
*/How to Avoid This in BigInteger
Use divideAndRemainder() or divide() safely when exact division is not guaranteed:
BigInteger a = new BigInteger("10");
BigInteger b = new BigInteger("3");
BigInteger[] result = a.divideAndRemainder(b);
System.out.println("Quotient: " + result[0]);
System.out.println("Remainder: " + result[1]);
//Output
Quotient: 3
Remainder: 1Code language: JavaScript (javascript)BigInteger does not support decimal precision or rounding like HALF_UP.ArithmeticException may occur when an operation assumes exact division but the result is fractional.Use BigDecimal instead if you need precision control and rounding modes such as HALF_UP.