org.apfloat.internal

Class IntCRTMath

java.lang.Object

org.apfloat.internal.IntBaseMath

org.apfloat.internal.IntCRTMath

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

IntCarryCRTStepStrategy

public class IntCRTMath
extends IntBaseMath

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

Version:

1.6

Author:

Mikko Tommila

See Also:

Serialized Form

Constructor Summary

Constructors

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

Method Summary

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

Methods inherited from class org.apfloat.internal.IntBaseMath

baseAdd, baseDivide, baseMultiplyAdd, baseSubtract

Methods inherited from class java.lang.Object

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

Constructor Detail

IntCRTMath

public IntCRTMath(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(int[] src,
                           int factor,
                           int[] 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 int compare(int[] src1,
                         int[] 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 int add(int[] src,
                     int[] 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(int[] src,
                           int[] 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 int divide(int[] 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.