Kevin Jackson a écrit :
Adding these would greatly simplify my current code, or if anyone
knows how to get the mantissa without resorting to String manipulation
- even using x * 10^mantissaLength % 10^mantissaLength /
10^mantissaLength is fairly nasty in client code (and you get rounding
errors that way).
Here is some code from the
org.apache.commons.math.util.MathUtils.nextAfter method:
// split the double in raw components
long bits = Double.doubleToLongBits(d);
long sign = bits & 0x8000000000000000L;
long exponent = bits & 0x7ff0000000000000L;
long mantissa = bits & 0x000fffffffffffffL;
This snippet cuold be promoted to public methods by itself (beware that
the exponent part is the raw exponent which includes an offset, it is
not a simple integer).
Luc
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