SIGNIFICAND

Section: Linux Programmer's Manual (3)
Updated: 2009-02-04
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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 non-standard; the double version is available on a number of other systems.

COLOPHON