significand(3) Library Functions Manual significand(3)

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

Math library (libm, -lm)

#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

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.

For an explanation of the terms used in this section, see attributes(7).

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




ilogb(3), scalb(3)

2023-07-20 Linux man-pages 6.05.01