Linux manual pages Section 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);
 
[Note] Note
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
[Note] Note

Link with −lm.

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).

Interface Attribute Value
significand(), significandf(), significandl() Thread safety MT-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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