получить мантиссу числа с плавающей запятой (get mantissa of floating-point number)
Имя (Name)
significand, significandf, significandl - get mantissa of
floating-point number
Синопсис (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 <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
Описание (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.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│significand(), significandf(), │ Thread safety │ MT-Safe │
│significandl() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
These functions are nonstandard; the double version is available
on a number of other systems.
Смотри также (See also)
ilogb(3), scalb(3)
