12-19-2002
There is no guarantee that long double is different from double, nor that double is different from float. You should be able to see the limits of each type by looking at <float.h>.
Hmmm...according to
this fibonacci calculator, fib(10000) is an integer with 2090 digits. Your floating point unit is going to need a rather large mantissa. Good thing you went with long double.
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LEARN ABOUT LINUX
significand
SIGNIFICAND(3) Linux Programmer's Manual SIGNIFICAND(3)
NAME
significand, significandf, significandl - get mantissa of floating-point number
SYNOPSIS
#include <math.h>
double significand(double x);
float significandf(float x);
long double significandl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
significand(), significandf(), significandl():
_SVID_SOURCE || _BSD_SOURCE
DESCRIPTION
The significand() function returns the mantissa of x scaled to the range [1,2). It is equivalent to
scalb(x, (double) -ilogb(x))
This function exists mainly for use in certain standardized tests for IEEE 754 conformance.
CONFORMING TO
These functions are nonstandard; the double version is available on a number of other systems.
SEE ALSO
ilogb(3), scalb(3)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
2009-02-04 SIGNIFICAND(3)