Package dev.gmitch215.bytebox.text

Class DoubleSynthesizer

java.lang.Object

dev.gmitch215.bytebox.text.DoubleSynthesizer

public final class DoubleSynthesizer
extends Object

Where DecimalFormat gets the double for a number it read, in place of the class library's.

The original multiplies by a 64-bit table entry and rounds, so its answer is off by one unit in the last place for some decimals (1e23, 3.687639494787356E-165) and is zero for 4.9E-324. The platform's Number rounds a decimal correctly, so the digits the lexer collected are handed to it. The lexer keeps the first 19 significant digits and drops the rest.

Found through Substitutions.

Method Summary

Modifier and Type	Method	Description
static double	synthesizeDouble(long mantissa, int exp, boolean negative)

Methods inherited from class java.lang.Object

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

Method Details

synthesizeDouble

public static double synthesizeDouble(long mantissa,
 int exp,
 boolean negative)

Parameters:

mantissa - up to 19 digits, unsigned, the first at 10^18

exp - the power of ten of the first digit

negative - whether the sign was a minus

Returns:

the double nearest the decimal