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