mirror of
https://github.com/DanilaFe/abacus
synced 2024-12-23 16:00:09 -08:00
Implement preciseNumber for arbitrary precision.
This commit is contained in:
parent
df0b1829ff
commit
851c63115f
|
@ -88,6 +88,9 @@ public class NaiveNumber implements NumberInterface {
|
||||||
@Override
|
@Override
|
||||||
public NumberInterface promoteTo(Class<? extends NumberInterface> toClass) {
|
public NumberInterface promoteTo(Class<? extends NumberInterface> toClass) {
|
||||||
if(toClass == this.getClass()) return this;
|
if(toClass == this.getClass()) return this;
|
||||||
|
else if(toClass == PreciseNumber.class){
|
||||||
|
return new PreciseNumber(Double.toString(value));
|
||||||
|
}
|
||||||
return null;
|
return null;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
112
src/org/nwapw/abacus/number/PreciseNumber.java
Executable file
112
src/org/nwapw/abacus/number/PreciseNumber.java
Executable file
|
@ -0,0 +1,112 @@
|
||||||
|
package org.nwapw.abacus.number;
|
||||||
|
|
||||||
|
import java.math.BigDecimal;
|
||||||
|
import java.math.BigInteger;
|
||||||
|
import java.math.MathContext;
|
||||||
|
import java.math.RoundingMode;
|
||||||
|
|
||||||
|
public class PreciseNumber implements NumberInterface{
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The number one.
|
||||||
|
*/
|
||||||
|
static final PreciseNumber ONE = new PreciseNumber(BigDecimal.ONE);
|
||||||
|
/**
|
||||||
|
* The number zero.
|
||||||
|
*/
|
||||||
|
static final PreciseNumber ZERO = new PreciseNumber(BigDecimal.ZERO);
|
||||||
|
/**
|
||||||
|
* The number ten.
|
||||||
|
*/
|
||||||
|
static final PreciseNumber TEN = new PreciseNumber(BigDecimal.TEN);
|
||||||
|
|
||||||
|
BigDecimal value = new BigDecimal("0");
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Constructs a precise number from the given string.
|
||||||
|
* @param string a string representation of the number meeting the same conditions
|
||||||
|
* as the BidDecimal(String) constructor.
|
||||||
|
*/
|
||||||
|
public PreciseNumber(String string){
|
||||||
|
value = new BigDecimal(string);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Constructs a precise number from the given BigDecimal.
|
||||||
|
* @param value a BigDecimal object representing the value of the number.
|
||||||
|
*/
|
||||||
|
public PreciseNumber(BigDecimal value){
|
||||||
|
this.value = value;
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public int precision() {
|
||||||
|
return 54;
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public NumberInterface multiply(NumberInterface multiplier) {
|
||||||
|
return new PreciseNumber(value.multiply(((PreciseNumber) multiplier).value));
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public NumberInterface divide(NumberInterface divisor) {
|
||||||
|
return new PreciseNumber(value.divide(((PreciseNumber) divisor).value, this.precision(), RoundingMode.HALF_UP));
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public NumberInterface add(NumberInterface summand) {
|
||||||
|
return new PreciseNumber(value.add(((PreciseNumber) summand).value));
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public NumberInterface subtract(NumberInterface subtrahend) {
|
||||||
|
return new PreciseNumber(value.subtract(((PreciseNumber) subtrahend).value));
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public NumberInterface intPow(int exponent) {
|
||||||
|
if(exponent == 0){
|
||||||
|
return PreciseNumber.ONE;
|
||||||
|
}
|
||||||
|
boolean takeReciprocal = exponent < 0;
|
||||||
|
exponent = Math.abs(exponent);
|
||||||
|
NumberInterface power = this;
|
||||||
|
for(int currentExponent = 1; currentExponent < exponent; currentExponent++){
|
||||||
|
power = power.multiply(this);
|
||||||
|
}
|
||||||
|
if(takeReciprocal){
|
||||||
|
power = PreciseNumber.ONE.divide(power);
|
||||||
|
}
|
||||||
|
return power;
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public int compareTo(NumberInterface number) {
|
||||||
|
return value.compareTo(((PreciseNumber) number).value);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public int signum() {
|
||||||
|
return value.signum();
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public NumberInterface negate(){
|
||||||
|
return new PreciseNumber(value.negate());
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public NumberInterface promoteTo(Class<? extends NumberInterface> toClass) {
|
||||||
|
if(toClass == this.getClass()){
|
||||||
|
return this;
|
||||||
|
}
|
||||||
|
return null;
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public String toString() {
|
||||||
|
BigDecimal rounded = value.setScale(precision() - 4, RoundingMode.HALF_UP);
|
||||||
|
return rounded.stripTrailingZeros().toPlainString();
|
||||||
|
}
|
||||||
|
}
|
|
@ -228,7 +228,7 @@ public class StandardPlugin extends Plugin {
|
||||||
|
|
||||||
@Override
|
@Override
|
||||||
protected NumberInterface applyInternal(NumberInterface[] params) {
|
protected NumberInterface applyInternal(NumberInterface[] params) {
|
||||||
return StandardPlugin.this.getOperator("^").getFunction().apply(params[0], (new NaiveNumber(0.5)));
|
return StandardPlugin.this.getOperator("^").getFunction().apply(params[0], ((new NaiveNumber(0.5)).promoteTo(params[0].getClass())));
|
||||||
}
|
}
|
||||||
});
|
});
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in New Issue
Block a user