significand man page

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():

/* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 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 attributes(7).

InterfaceAttributeValue
significand(),
significandf(),
significandl()
Thread safetyMT-Safe

Conforming to

These functions are nonstandard; the double version is available on a number of other systems.

See Also

ilogb(3), scalb(3)

Colophon

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Referenced By

ilogb(3).

significandf(3) and significandl(3) are aliases of significand(3).

2016-03-15 GNU Linux Programmer's Manual