frexpl(3) [posix man page]

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

NAME

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

SYNOPSIS

       #include <math.h>

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

DESCRIPTION

       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.

RETURN VALUE

       For finite arguments, these functions shall return the value x, such that x has a magnitude in the interval [0.5,1) 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.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       isnan() , ldexp() , modf() , the Base Definitions volume of IEEE Std 1003.1-2001, <math.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .

IEEE
/The Open Group						       2003								  FREXP(P)

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

PROLOG

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

NAME

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

SYNOPSIS

       #include <math.h>

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

DESCRIPTION

       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.1-2008 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.

RETURN VALUE

       For finite arguments, these functions shall return the value x, such that x has a magnitude in the interval [1/2,1) 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.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       isnan(), ldexp(), modf()

       The Base Definitions volume of POSIX.1-2008, <math.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/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						       2013								 FREXP(3P)