Change precision to getMaxPrecision, as precision can be configured.

src/org/nwapw/abacus/number/NaiveNumber.java

@@ -10,6 +10,13 @@ public class NaiveNumber implements NumberInterface {
      */
     private double value;
 
+    /**
+     * Creates a new NaiveNumber with the given string.
+     * @param value the value, which will be parsed as a double.
+     */
+    public NaiveNumber(String value) {
+        this(Double.parseDouble(value));
+    }
     /**
      * Creates a new NaiveNumber with the given value.
      * @param value the value to use.
@@ -28,7 +35,7 @@ public class NaiveNumber implements NumberInterface {
     public static final NaiveNumber ONE = new NaiveNumber(1);
 
     @Override
-    public int precision() {
+    public int getMaxPrecision() {
         return 18;
     }
 

src/org/nwapw/abacus/number/NumberInterface.java

@@ -6,10 +6,10 @@ package org.nwapw.abacus.number;
 public interface NumberInterface {
 
     /**
-     * The precision to which this number operates.
+     * The maximum precision to which this number operates.
      * @return the precision.
      */
-    int precision();
+    int getMaxPrecision();
 
     /**
      * Multiplies this number by another, returning

src/org/nwapw/abacus/number/PreciseNumber.java

@@ -1,8 +1,6 @@
 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{
@@ -43,7 +41,7 @@ public class PreciseNumber implements NumberInterface{
     }
 
     @Override
-    public int precision() {
+    public int getMaxPrecision() {
         return 54;
     }
 
@@ -54,7 +52,7 @@ public class PreciseNumber implements NumberInterface{
 
     @Override
     public NumberInterface divide(NumberInterface divisor) {
-        return new PreciseNumber(value.divide(((PreciseNumber) divisor).value, this.precision(), RoundingMode.HALF_UP));
+        return new PreciseNumber(value.divide(((PreciseNumber) divisor).value, this.getMaxPrecision(), RoundingMode.HALF_UP));
     }
 
     @Override
@@ -109,7 +107,7 @@ public class PreciseNumber implements NumberInterface{
 
     @Override
     public String toString() {
-        BigDecimal rounded = value.setScale(precision() - 4, RoundingMode.HALF_UP);
+        BigDecimal rounded = value.setScale(getMaxPrecision() - 4, RoundingMode.HALF_UP);
         return rounded.stripTrailingZeros().toPlainString();
     }
 }

src/org/nwapw/abacus/plugin/StandardPlugin.java

@@ -292,7 +292,7 @@ public class StandardPlugin extends Plugin {
      * @return the maximum error.
      */
     private NumberInterface getMaxError(NumberInterface number){
-        return (new NaiveNumber(10)).promoteTo(number.getClass()).intPow(-number.precision());
+        return (new NaiveNumber(10)).promoteTo(number.getClass()).intPow(-number.getMaxPrecision());
     }
 
 }