извлекать целые и дробные значения со знаком из числа с плавающей запятой (extract signed integral and fractional values from floating-point number)
Имя (Name)
modf, modff, modfl - extract signed integral and fractional
values from floating-point number
Синопсис (Synopsis)
#include <math.h>
double modf(double x, double *iptr);
float modff(float x, float *iptr);
long double modfl(long double x, long double *iptr);
Link with -lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
modff(), modfl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
Описание (Description)
These functions break the argument x into an integral part and a
fractional part, each of which has the same sign as x. The
integral part is stored in the location pointed to by iptr.
Возвращаемое значение (Return value)
These functions return the fractional part of x.
If x is a NaN, a NaN is returned, and *iptr is set to a NaN.
If x is positive infinity (negative infinity), +0 (-0) is
returned, and *iptr is set to positive infinity (negative
infinity).
Ошибки (Error)
No errors occur.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│modf(), modff(), modfl() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
Смотри также (See also)
frexp(3), ldexp(3)
