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### java lang arithmeticexception rounding necessary

The “java.lang.ArithmeticException: Rounding necessary” is a runtime exception that occurs when a mathematical operation involving floating-point numbers requires rounding to an integer value, but the result is too large or too small to be represented as an integer.

This exception is typically thrown by methods in the Java standard library that involve floating-point arithmetic, such as Math.round() and BigDecimal.setScale(). It indicates that the result of the operation cannot be represented exactly as a floating-point number and therefore requires rounding.

To avoid this exception, you can either adjust the precision of the floating-point numbers being used or choose a different rounding method that does not result in a value that is too large or too small to be represented as an integer. You can also catch the ArithmeticException and handle it appropriately in your code, such as by displaying an error message to the user or taking corrective action to prevent the exception from occurring again.

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Java: Rounding Numbers (Math.round(), DecimalFormat & printf)

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### BigDecimal

BigDecimal is a class in Java that provides support for arbitrary-precision decimal arithmetic. It is used to perform calculations with a very high level of precision and accuracy, particularly when dealing with very large or very small numbers.

The BigDecimal class allows the programmer to specify the precision and rounding mode used in calculations, making it ideal for financial and scientific applications where accuracy is of utmost importance. Unlike other numeric types in Java, such as double and float, BigDecimal objects are immutable, which means that their values cannot be changed once they are created.

When performing calculations with BigDecimal, it is important to keep in mind that the operations can be computationally expensive, especially for very large numbers. Therefore, it is often necessary to optimize the code for performance and memory usage, while still ensuring that the calculations are accurate.

Overall, BigDecimal is a powerful and versatile tool for precise arithmetic in Java, and is widely used in financial, scientific, and other applications where high precision is required.

### BigInteger vs BigDecimal

BigInteger and BigDecimal are both classes in Java used for mathematical operations on very large numbers that exceed the range of primitive data types like int, long, float, and double. However, they differ in the way they represent numbers and the operations they can perform.

BigInteger is used to represent integers of arbitrary length, meaning there is no upper limit on the size of the number that can be represented. It is immutable, which means that once a BigInteger object is created, its value cannot be changed. BigInteger supports a wide range of mathematical operations such as addition, subtraction, multiplication, division, and modular arithmetic.

BigDecimal, on the other hand, is used to represent numbers with a decimal point, such as floating-point numbers. It is also immutable and supports many of the same mathematical operations as BigInteger, as well as more advanced operations like rounding, scaling, and comparison.

The main difference between the two classes is that BigInteger is used for integers while BigDecimal is used for decimal numbers. BigInteger is used when exact calculations are required, such as in cryptography or financial applications. BigDecimal is used when decimal precision is required, such as in calculations involving money or measurements.

In summary, BigInteger and BigDecimal are both useful classes for performing mathematical operations on large numbers, but the choice between them depends on the specific requirements of the application. If the number is an integer, use BigInteger, and if it’s a decimal number, use BigDecimal.

You can see some more information related to java lang arithmeticexception rounding necessary here

- Rounding necessary with BigDecimal numbers – Stack Overflow
- java.lang.ArithmeticException: Rounding necessary
- A Weird Exception When Using Java’s BigDecimal, java.lang …
- ArithmeticException: Rounding necessary #1944 – GitHub
- BigDecimal in Java With Examples – Tech Tutorials
- java.math.BigDecimal.toBigIntegerExact java code examples
- Quickest way to get 2 decimal places from BigDecimal?
- 3175476 – java.lang.ArithmeticException: Rounding necessary
- BigDecimal setScale() causes java.lang.ArithmeticException
- Java.math.BigDecimal.setScale() Method – Tutorialspoint

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