# How do I use BigDecimal?

Category: technology and computing programming languages
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Using a BigDecimal implies that you should:
1. Create new BigDecimal variables, using the constructor.
2. In order to add a BigDecimal to another BigDecimal, use add(BigDecimal augend) API method, that returns a BigDecimal whose value is (this + augend), and whose scale is max(this.

Also, how is BigDecimal defined?

A BigDecimal consists of a random precision integer unscaled value and a 32-bit integer scale. If greater than or equal to zero, the scale is the number of digits to the right of the decimal point. If less than zero, the unscaled value of the number is multiplied by 10^(-scale).

Additionally, what is scale and precision in BigDecimal? Java BigDecimal Precision and Scale By Definition, precision indicates the length of arbitrary precision integer whereas scale means the number of digits to the right of the decimal point. For example if we have a number “100.25” then precision is 5 because we need five digits to write down this number and scale is 2.

People also ask, what is the use of BigDecimal in Java?

The BigDecimal class provides operation for arithmetic, comparison, hashing, rounding, manipulation and format conversion. This method can handle very small and very big floating point numbers with great precision. In java, BigDecimal consists of a random precision integer scale and a 32-bit integer scale.

What is the base of BigDecimal data type?

Explanation: A BigDecimal is n*10^scale where n is an arbitrary large signed integer. Scale can be thought of as the number of digits to move the decimal point to left or right.

### How do I check if BigDecimal is integer?

7 Answers. Depending on the source/usage of your BigDecimal values it might be faster to check if the scale <= 0 first. If it is, then it's definitely an integer value in the mathematical sense. If it is >0, then it could still be an integer value and the more expensive test would be needed.

### Can BigDecimal be negative?

Class BigDecimal. Immutable, arbitrary-precision signed decimal numbers. A BigDecimal consists of an arbitrary precision integer unscaled value and a 32-bit integer scale. If negative, the unscaled value of the number is multiplied by ten to the power of the negation of the scale.

### How do I compare BigDecimal values?

Use the compareTo method of BigDecimal : public int compareTo(BigDecimal val) Compares this BigDecimal with the specified BigDecimal. Returns: -1, 0, or 1 as this BigDecimal is numerically less than, equal to, or greater than val. BigDecimal isn't a primitive, so you cannot use the < , > operators.

### How can I compare two BigDecimal values?

compareTo(BigDecimal val) compares the BigDecimal Object with the specified BigDecimal value. Two BigDecimal objects that are equal in value but have a different scale (like 2.0 and 2.00) are considered equal by this method.

### How do you round BigDecimal?

BigDecimal. round(MathContext m) is an inbuilt method in Java that returns a BigDecimal value rounded according to the MathContext settings. If the precision setting is 0 then no rounding takes place.

### How do you multiply BigDecimal?

BigDecimal multiply() Method in Java
scale() + multiplicand. scale()). Parameters: This method accepts a single parameter multiplicand of BigDecimal type which refers to the Value to be multiplied by this BigDecimal. Return value: This method returns a BigDecimal whose value this * multiplicand.

### What is precision BigDecimal?

A BigDecimal is defined by two values: an arbitrary precision integer and a 32-bit integer scale. The value of the BigDecimal is defined to be . Precision: The precision is the number of digits in the unscaled value. For instance, for the number 123.45, the precision returned is 5.

### What is MathContext in Java?

MathContext class provides immutable objects which encapsulate the context settings and describes certain rules for numerical operators, such as those implemented by the BigDecimal class.

### How do I use BigDecimal in Java?

Using a BigDecimal implies that you should: Create new BigDecimal variables, using the constructor. In order to add a BigDecimal to another BigDecimal, use add(BigDecimal augend) API method, that returns a BigDecimal whose value is (this + augend), and whose scale is max(this. scale(), augend.

### Is BigDecimal slow?

BigDecimal is almost certainly much slower than corresponding calculation using float or double would be - but very, very often, this is still much faster than you really need it to be, so who cares? This is also true of memory usage, incidentally.

### What is the range of BigInteger in Java?

BigInteger must support values in the range -2 Integer.MAX_VALUE (exclusive) to +2 Integer.MAX_VALUE (exclusive) and may support values outside of that range. The range of probable prime values is limited and may be less than the full supported positive range of BigInteger . The range must be at least 1 to 2500000000.

### What is decimal in Java?

Decimal Numbers in Java
Java provides two primitive types that can be used for storing decimal numbers: float and double. double PI = 3.1415 ; However, both types should never be used for precise values, such as currencies. For that, and also for rounding, we can use the BigDecimal class.

### What is BigInteger in Java?

BigInteger Class in Java. BigInteger class is used for mathematical operation which involves very big integer calculations that are outside the limit of all available primitive data types. For example factorial of 100 contains 158 digits in it so we can't store it in any primitive data type available.

### How do you convert big decimal to string?

BigDecimal toString() Method in Java with Examples
A standard canonical string form of the BigDecimal is created by converting the absolute value of the unscaled value of BigDecimal in base ten using the characters '0' through '9' with no leading zeros except when the value is 0, then single character '0' is used.

### Which data type you should used to represent currency in Java?

Java has Currency class that represents the ISO 4217 currency codes. BigDecimal is the best type for representing currency decimal values. Joda Money has provided a library to represent money.

### Why is BigDecimal better than double for representing dollar amounts?

A BigDecimal is an exact way of representing numbers. A Double has a certain precision. Working with doubles of various magnitudes (say d1=1000.0 and d2=0.001 ) could result in the 0.001 being dropped alltogether when summing as the difference in magnitude is so large. With BigDecimal this would not happen.

### What is scale precision?

Precision is the number of digits in a number. Scale is the number of digits to the right of the decimal point in a number. For example, the number 123.45 has a precision of 5 and a scale of 2.