significand(3) Library Functions Manual significand(3)
NAME
significand, significandf, significandl - get mantissa of floating-
point number
LIBRARY
Math library (libm, -lm)
SYNOPSIS
#include <math.h>
double significand(double x);
float significandf(float x);
long double significandl(long double x);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
significand(), significandf(), significandl():
/* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
These functions return the mantissa of x scaled to the range [1,2).
They are equivalent to
scalb(x, (double) -ilogb(x))
This function exists mainly for use in certain standardized tests for
IEEE 754 conformance.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
┌────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├────────────────────────────────────────────┼───────────────┼─────────┤
│significand(), significandf(), │ Thread safety │ MT-Safe │
│significandl() │ │ │
└────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
These functions are nonstandard; the double version is available on a
number of other systems.
SEE ALSO
ilogb(3), scalb(3)
Linux man-pages 6.03 2023-02-05 significand(3)
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