How to Avoid 'ArithmeticException: Non-terminating decimal expansion' in BigDecimal Division?

Avoiding Non-Terminating Decimal Expansions in BigDecimal Division

Java's BigDecimal class is designed to facilitate high-precision mathematical operations, but it can sometimes throw an "ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result" error. This exception occurs when dividing two BigDecimal objects and the quotient has an infinite decimal expansion.

Reason for the Exception

According to the BigDecimal documentation, when no MathContext object (specifying precision and rounding mode) is provided, arithmetic operations are performed exactly. If the quotient has a non-terminating decimal expansion and cannot be represented exactly, the exception is thrown.

Example

BigDecimal a = new BigDecimal("1.6");
BigDecimal b = new BigDecimal("9.2");
a.divide(b) // raises the ArithmeticException

Fix

To resolve the issue, you can specify a MathContext object with a non-zero precision and a rounding mode. For example:

a.divide(b, 2, RoundingMode.HALF_UP)

Here, 2 specifies the scale (number of decimal places) and RoundingMode.HALF_UP denotes the rounding method.

Additional Information

• ArithmeticContext objects allow you to control the rounding and precision of calculations.
• If an exact result cannot be obtained, the operation will use the specified rounding mode to approximate the result.
• Refer to the Java documentation or this blog post for more details: https://blog.frankel.ch/2013/09/avoid-arithmetic-exception-in-java-bigdecimals.html

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