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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\" Linux libc source code
-.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\" 386BSD man pages
-.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 2002-07-27 by Walter Harms
-.\" (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.TH frexp 3 2024-01-29 "Linux man-pages 6.7"
-.SH NAME
-frexp, frexpf, frexpl \- convert floating-point number to fractional
-and integral components
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double frexp(double " x ", int *" exp );
-.BI "float frexpf(float " x ", int *" exp );
-.BI "long double frexpl(long double " x ", int *" exp );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR frexpf (),
-.BR frexpl ():
-.nf
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
- || /* Since glibc 2.19: */ _DEFAULT_SOURCE
- || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions are used to split the number
-.I x
-into a
-normalized fraction and an exponent which is stored in
-.IR exp .
-.SH RETURN VALUE
-These functions return the normalized fraction.
-If the argument
-.I x
-is not zero,
-the normalized fraction is
-.I x
-times a power of two,
-and its absolute value is always in the range 1/2 (inclusive) to
-1 (exclusive), that is, [0.5,1).
-.P
-If
-.I x
-is zero, then the normalized fraction is
-zero and zero is stored in
-.IR exp .
-.P
-If
-.I x
-is a NaN,
-a NaN is returned, and the value of
-.I *exp
-is unspecified.
-.P
-If
-.I x
-is positive infinity (negative infinity),
-positive infinity (negative infinity) is returned, and the value of
-.I *exp
-is unspecified.
-.SH ERRORS
-No errors occur.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR frexp (),
-.BR frexpf (),
-.BR frexpl ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.P
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD, C89.
-.SH EXAMPLES
-The program below produces results such as the following:
-.P
-.in +4n
-.EX
-.RB "$" " ./a.out 2560"
-frexp(2560, &e) = 0.625: 0.625 * 2\[ha]12 = 2560
-.RB "$" " ./a.out \-4"
-frexp(\-4, &e) = \-0.5: \-0.5 * 2\[ha]3 = \-4
-.EE
-.in
-.SS Program source
-\&
-.\" SRC BEGIN (frexp.c)
-.EX
-#include <float.h>
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-\&
-int
-main(int argc, char *argv[])
-{
- double x, r;
- int exp;
-\&
- x = strtod(argv[1], NULL);
- r = frexp(x, &exp);
-\&
- printf("frexp(%g, &e) = %g: %g * %d\[ha]%d = %g\en", x, r, r, 2, exp, x);
- exit(EXIT_SUCCESS);
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR ldexp (3),
-.BR modf (3)