## Class DoubleCRTMath

• All Implemented Interfaces:
`Serializable`
Direct Known Subclasses:
`DoubleCarryCRTStepStrategy`

```public class DoubleCRTMath
extends DoubleBaseMath```
Basic arithmetic for calculating the Chinese Remainder Theorem. Works for the `double` type.
Version:
1.6
Author:
Mikko Tommila
Serialized Form
• ### Constructor Summary

Constructors
Constructor Description
`DoubleCRTMath​(int radix)`
Creates a carry-CRT math using the specified radix.
• ### Method Summary

Modifier and Type Method Description
`double` ```add​(double[] src, double[] srcDst)```
`double` ```compare​(double[] src1, double[] src2)```
Compares three words.
`double` `divide​(double[] srcDst)`
Divides three words by the base to produce two words.
`void` ```multiply​(double[] src, double factor, double[] dst)```
Multiplies two words by one word to produce a result of three words.
`void` ```subtract​(double[] src, double[] srcDst)```
Subtracts three words.
• ### Methods inherited from class org.apfloat.internal.DoubleBaseMath

`baseAdd, baseDivide, baseMultiplyAdd, baseSubtract`
• ### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
• ### Constructor Detail

• #### DoubleCRTMath

`public DoubleCRTMath​(int radix)`
Creates a carry-CRT math using the specified radix.
Parameters:
`radix` - The radix that will be used.
• ### Method Detail

• #### multiply

```public final void multiply​(double[] src,
double factor,
double[] dst)```
Multiplies two words by one word to produce a result of three words. Most significant word is stored first.
Parameters:
`src` - Source array, first multiplicand.
`factor` - Second multiplicand.
`dst` - Destination array.
• #### compare

```public final double compare​(double[] src1,
double[] src2)```
Compares three words. Most significant word is stored first.
Parameters:
`src1` - First operand.
`src2` - Second operand.
Returns:
Less than zero if `src1 < src2`, greater than zero if `src1 > src2` and zero if `src1 == src2`.

```public final double add​(double[] src,
double[] srcDst)```
Adds three words. Most significant word is stored first.
Parameters:
`src` - First operand.
`srcDst` - Second operand, and destination of the operation.
Returns:
Overflow carry bit.
• #### subtract

```public final void subtract​(double[] src,
double[] srcDst)```
Subtracts three words. Most significant word is stored first.
Parameters:
`src` - First operand.
`srcDst` - Second operand, and destination of the operation.
• #### divide

`public final double divide​(double[] srcDst)`
Divides three words by the base to produce two words. Most significant word is stored first.
Parameters:
`srcDst` - Source and destination of the operation.
Returns:
Remainder of the division.