frexp(3p) — Справочная страница Linux

FREXP(3P)               POSIX Programmer's Manual              FREXP(3P)

ПРЕДИСЛОВИЕ

       This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

ИМЯ

       frexp, frexpf, frexpl — extract mantissa and exponent from a
       double precision number

СИНТАКСИС

       #include <math.h>

       double frexp(double num, int *exp);
       float frexpf(float num, int *exp);
       long double frexpl(long double num, int *exp);

ОПИСАНИЕ

       The functionality described on this reference page is aligned
       with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This
       volume of POSIX.1‐2017 defers to the ISO C standard.

       These functions shall break a floating-point number num into a
       normalized fraction and an integral power of 2. The integer
       exponent shall be stored in the int object pointed to by exp.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       For finite arguments, these functions shall return the value x,
       such that x has a magnitude in the interval [½,1) or 0, and num
       equals x times 2 raised to the power *exp.

       If num is NaN, a NaN shall be returned, and the value of *exp is
       unspecified.

       If num is ±0, ±0 shall be returned, and the value of *exp shall
       be 0.

       If num is ±Inf, num shall be returned, and the value of *exp is
       unspecified.

ОШИБКИ

       No errors are defined.

       The following sections are informative.

ПРИМЕРЫ

       None.

ПРИМЕНЕНИЕ В ПРОГРАММАХ

       None.

ОБЪЯСНЕНИЕ

       None.

НАПРАВЛЕНИЯ РАЗВИТИЯ

       None.

СМОТРИТЕ ТАКЖЕ

       isnan(3p), ldexp(3p), modf(3p)

       The Base Definitions volume of POSIX.1‐2017, math.h(0p)

АВТОРСКИЕ ПРАВА

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  In the event of any
       discrepancy between this version and the original IEEE and The
       Open Group Standard, the original IEEE and The Open Group
       Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page
       are most likely to have been introduced during the conversion of
       the source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                         FREXP(3P)

Страницы, которые ссылаются на эту страницу: math.h(0p), ldexp(3p), modf(3p)