Package org.apfloat.internal

Class LongCRTMath

java.lang.Object

org.apfloat.internal.LongBaseMath

org.apfloat.internal.LongCRTMath

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

LongCarryCRTStepStrategy

public class LongCRTMath
extends LongBaseMath

Basic arithmetic for calculating the Chinese Remainder Theorem. Works for the long type.

Version:

1.6

Author:

Mikko Tommila

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
LongCRTMath(int radix)	Creates a carry-CRT math using the specified radix.

Method Summary

Modifier and Type	Method	Description
final long	add(long[] src, long[] srcDst)	Adds three words.
final long	compare(long[] src1, long[] src2)	Compares three words.
final long	divide(long[] srcDst)	Divides three words by the base to produce two words.
final void	multiply(long[] src, long factor, long[] dst)	Multiplies two words by one word to produce a result of three words.
final void	subtract(long[] src, long[] srcDst)	Subtracts three words.

Methods inherited from class org.apfloat.internal.LongBaseMath

baseAdd, baseDivide, baseMultiplyAdd, baseSubtract

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

LongCRTMath

public LongCRTMath(int radix)

Creates a carry-CRT math using the specified radix.

Parameters:

radix - The radix that will be used.

Method Details

multiply

public final void multiply(long[] src,
 long factor,
 long[] 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 long compare(long[] src1,
 long[] 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.

add

public final long add(long[] src,
 long[] 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(long[] src,
 long[] 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 long divide(long[] 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.