modf(3) — Страница руководства Linux

modf(3)                 Library Functions Manual                 modf(3)

ИМЯ

       modf, modff, modfl - extract signed integral and fractional
       values from floating-point number

БИБЛИОТЕКА

       Math library (libm, -lm)

СИНТАКСИС

       #include <math.h>

       double modf(double x, double *iptr);
       float modff(float x, float *iptr);
       long double modfl(long double x, long double *iptr);

   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

       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.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       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

       No errors occur.

АТРИБУТЫ

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ modf(), modff(), modfl()            │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

СТАНДАРТЫ

       C11, POSIX.1-2008.

ИСТОРИЯ

       C99, POSIX.1-2001.

       The variant returning double also conforms to SVr4, 4.3BSD, C89.

СМОТРИТЕ ТАКЖЕ

       frexp(3), ldexp(3)

КОЛОФОН

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Linux man-pages 6.9.1          2024-05-02                        modf(3)

Страницы, ссылающиеся на эту страницу: frexp(3), ldexp(3)