Java double to biginteger

Class BigInteger

Immutable arbitrary-precision integers. All operations behave as if BigIntegers were represented in two’s-complement notation (like Java’s primitive integer types). BigInteger provides analogues to all of Java’s primitive integer operators, and all relevant methods from java.lang.Math. Additionally, BigInteger provides operations for modular arithmetic, GCD calculation, primality testing, prime generation, bit manipulation, and a few other miscellaneous operations.

Semantics of arithmetic operations exactly mimic those of Java’s integer arithmetic operators, as defined in The Java Language Specification. For example, division by zero throws an ArithmeticException , and division of a negative by a positive yields a negative (or zero) remainder.

Semantics of shift operations extend those of Java’s shift operators to allow for negative shift distances. A right-shift with a negative shift distance results in a left shift, and vice-versa. The unsigned right shift operator ( >>> ) is omitted since this operation only makes sense for a fixed sized word and not for a representation conceptually having an infinite number of leading virtual sign bits.

Semantics of bitwise logical operations exactly mimic those of Java’s bitwise integer operators. The binary operators ( and , or , xor ) implicitly perform sign extension on the shorter of the two operands prior to performing the operation.

Comparison operations perform signed integer comparisons, analogous to those performed by Java’s relational and equality operators.

Modular arithmetic operations are provided to compute residues, perform exponentiation, and compute multiplicative inverses. These methods always return a non-negative result, between 0 and (modulus — 1) , inclusive.

Bit operations operate on a single bit of the two’s-complement representation of their operand. If necessary, the operand is sign-extended so that it contains the designated bit. None of the single-bit operations can produce a BigInteger with a different sign from the BigInteger being operated on, as they affect only a single bit, and the arbitrarily large abstraction provided by this class ensures that conceptually there are infinitely many «virtual sign bits» preceding each BigInteger.

For the sake of brevity and clarity, pseudo-code is used throughout the descriptions of BigInteger methods. The pseudo-code expression (i + j) is shorthand for «a BigInteger whose value is that of the BigInteger i plus that of the BigInteger j .» The pseudo-code expression (i == j) is shorthand for » true if and only if the BigInteger i represents the same value as the BigInteger j .» Other pseudo-code expressions are interpreted similarly.

All methods and constructors in this class throw NullPointerException when passed a null object reference for any input parameter. 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. An ArithmeticException is thrown when a BigInteger constructor or method would generate a value outside of the supported 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 2 500000000 .

Источник

Java Convert Double to BigInteger

In this Java core tutorial we learn how to convert a double value into a BigInteger value in Java programming language.

How to convert double to BigInteger in Java

In Java, with a given double value we can follow these steps to convert it into a BigInteger value.

• Step 1: convert the double value into long value by casting it to long.
• Step 2: instantiate a new BigInteger value from the long value from step 1 using the BigInteger.valueOf(long val) static method.

import java.math.BigInteger; public class ConvertDoubleToBigIntegerExample  public static void main(String. args)  double doubleValue = 999999; // Convert Double to BigInteger long longValue = (long)doubleValue; BigInteger bigIntegerValue = BigInteger.valueOf(longValue); System.out.println("double value: " + doubleValue); System.out.println("BigInteger value: " + bigIntegerValue); > >

double value: 999999.0 BigInteger value: 999999

Источник

Convert Double to BigInteger in Java [2 ways]

In this short post, I will be sharing how to convert Double to BigInteger in Java.

1. Using BigDecimal class valueOf() and toBigInteger() methods

2. Using the BigDecimal constructor and toBigInteger() method

Let’s dive deep into the topic:

Convert Double to BigInteger in Java

1. Using BigDecimal class valueOf() and toBigInteger() methods

We can easily convert Double to BigInteger in Java by performing two steps:

1. Convert Double to BigDecimal, using the BigDecimal class valueOf() method

2. Convert BigDecimal to BigInteger, using the BigDecimal class toBigInteger() method as shown below in the example:

import java.math.BigInteger; import java.math.BigDecimal; public class DoubleToBigInteger public static void main(String args[])  Double num = 5342.9876; BigDecimal bd = BigDecimal.valueOf(num); BigInteger bi = bd.toBigInteger(); System.out.println("Converted Double to BigInteger: " + bi); > > 

Output:
Converted Double to BigInteger: 5342

2. Using the BigDecimal constructor and toBigInteger() method

Just like above, we can easily convert Double to BigInteger in Java by performing two steps:

1. Convert Double to BigDecimal, using the BigDecimal class constructor

2. Convert BigDecimal to BigInteger, using BigDecimal class toBigInteger() method as shown in the example below:

import java.math.BigDecimal; import java.math.BigInteger; public class DoubleToBigInteger2  public static void main(String args[])  Double num2 = 7894.6342; BigDecimal bd2 = new BigDecimal(num2); BigInteger bi2 = bd2.toBigInteger(); System.out.println("Converted Double to BigInteger: " + bi2); > > 

Output:
Converted Double to BigInteger: 7894

That’s all for today. Please mention in the comments if you have any questions related to how to convert Double to BigInteger in Java with examples.

About The Author

Subham Mittal has worked in Oracle for 3 years.
Enjoyed this post? Never miss out on future posts by subscribing JavaHungry

Источник

Convert double to biginteger in java code example

This method is applicable on large value numbers of range much greater than the range of biggest data type double of Java without compromising with the precision of the result but as BigInteger class internally uses array of integers for processing, the operation on object of BigIntegers are not as fast as on primitives. Return value: This method returns a BigInteger which holds difference (this – val).

BigInteger subtract() Method in Java with Examples

The java.math.BigInteger.subtract(BigInteger val) is used to calculate the Arithmetic difference of two BigIntegers. This method is applicable on large value numbers of range much greater than the range of biggest data type double of Java without compromising with the precision of the result but as BigInteger class internally uses array of integers for processing, the operation on object of BigIntegers are not as fast as on primitives. This method performs an operation upon the current BigInteger by which this method is called and BigInteger passed as the parameter.

public BigInteger subtract(BigInteger val)

Parameters: This method accepts a parameter val which is the value to be subtracted from this BigInteger.

Return value: This method returns a BigInteger which holds difference (this – val).

Below programs is used to illustrate the subtract() method of BigInteger.

The difference of 56454210032311316797946498748 and 34664864678464621214565587864 is 21789345353846695583380910884

The difference of
1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234554324324362432767463726478326478326784637264783264736274673864736473246354635463546325645326456325463546536453654632546354653463254653453264564635463263453264654632498739473
and
1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234587327189371829748971463784817489127847281478217487124872184787483274637564756745781641263981283972189743897432865743657645762376914689217817436247362472164761247612748612746
is
-33002865009396981507737306491010801062644213434222388597510922746801391210121282235315618654827646726197360979211111111291108913660035764552871611899208711496592980249873273
Using double, difference is -3.300286500939698E172

As from the above examples, it is clear that the data is full precise when BigInteger is used.

Reference: https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/math/BigInteger.html#subtract(java.math.BigInteger)

Converting String to BigInteger in Java, String inputString = «290f98»; BigInteger result = new BigInteger(inputString, 16); assertEquals(«2690968», result.toString()); In this case, we’re specifying the radix, or base, as 16 for converting hexadecimal to decimal.. The other way is to first convert the non-decimal String into a byte array, and …

How to convert BigInteger to BigDecimal?

You have a parameterized constructor for that.

Источник