significand(3) - BetterMan

significand(3)

get mantissa of floating-point number

distropkg manpages-dev@6.9.1-1dataset 2026-04-01T06:19:02Z+debian+ec4110e+mandoc:1.14.6-4

Synopsis

#include <math.h>
double significand(double 
x
);
float significandf(float 
x
);
long double significandl(long double 
x
);
significand
(), 
significandf
(),
significandl
():
/* Since glibc 2.19: */ _DEFAULT_SOURCE
        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

—

Options · 2

significand()	BSD.
significand()	BSD.

NAME

significand, significandf, significandl - get mantissa of floating-point number

LIBRARY

Math library (libm, -lm)

SYNOPSIS

bash

#include <math.h>

bash

double significand(double \nx\n);\n
\nfloat significandf(float \nx\n);\n
\nlong double significandl(long double \nx\n);

significand(), significandf(), significandl():

bash


\n
    /* Since glibc 2.19: */ _DEFAULT_SOURCE
\n
        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

These functions return the mantissa of x scaled to the range [1, FLT_RADIX). They are equivalent to

bash

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

STANDARDS

None.

significand(): BSD.

HISTORY

significand(): BSD.