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java.lang.Object | +--java.lang.Number | +--org.znerd.math.RealNumber | +--org.znerd.math.RationalNumber | +--org.znerd.math.DigitSet
A set of digits, having a radix and an exponent. Objects of this type are used to implement rounding.
The value of a DigitSet
number is the sum of:
digits[0] * radixexponent
digits[1] * radixexponent - 1
digits[2] * radixexponent - 2
...
digits[precision - 1] * radixexponent - (precision - 1)
Fields inherited from class org.znerd.math.RealNumber |
MAXIMUM_RADIX |
Constructor Summary | |
protected |
DigitSet(IntegerNumber[] parts,
String asString)
Creates a new DigitSet instance. |
Method Summary | |
abstract int[] |
getDigits()
Returns a new array containing all the digits. |
abstract int |
getExponent()
Returns the exponent. |
abstract int |
getPrecision()
Returns the precision, the total number of digits. |
abstract int |
getRadix()
Returns the radix or base. |
DigitSet |
toPrecision(int precision)
Returns a digit set with the specified precision. |
protected abstract DigitSet |
toPrecisionImpl(int precision)
Returns a digit set with the specified precision, actual implementation. |
Methods inherited from class org.znerd.math.RationalNumber |
add,
add,
compareTo,
compareToImpl,
compareToImpl,
compareToImpl2,
divide,
divide,
doubleValue,
getDenominator,
getNumerator,
invert,
multiply,
multiply,
negate,
pow,
pow,
subtract,
subtract,
toBigDecimal,
toBigDecimal,
trunc |
Methods inherited from class org.znerd.math.RealNumber |
abs,
byteValue,
compareTo,
compareTo,
equals,
fitsByte,
fitsDouble,
fitsFloat,
fitsInt,
fitsLong,
fitsShort,
floatValue,
getSign,
intValue,
longValue,
shortValue,
toBigInteger,
toString |
Methods inherited from class java.lang.Object |
clone,
finalize,
getClass,
hashCode,
notify,
notifyAll,
wait,
wait,
wait |
Constructor Detail |
protected DigitSet(IntegerNumber[] parts, String asString) throws IllegalArgumentException
DigitSet
instance.parts
- an array containing the numerator and denonimator, not
null
, having at least 2 elements and not having a
null
at index 0 or 1.asString
- textual presentation of this number, not null
.asString == null
.Method Detail |
public abstract int getRadix()
public abstract int getExponent()
public abstract int[] getDigits()
int
value between 0 and the radix
(i.e. 0 <= n < radix
, where n is the digit).null
public abstract int getPrecision()
public final DigitSet toPrecision(int precision) throws IllegalArgumentException
this
) will be returned.
No rounding will be performed, only truncation. If the specified
precision is smaller than the precision of this DigitSet
,
then some of the digits will just be removed.
This method calls toPrecisionImpl(int)
after checking the
preconditions.
precision
- the precision, >= 1.DigitSet
that is equal to this number, truncated to
the specified precision, never null
.precision < 1
.protected abstract DigitSet toPrecisionImpl(int precision)
toPrecision(int)
.precision
- the precision, guaranteed to be >= 1.DigitSet
that is equal to this number, truncated to
the specified precision.
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