mirror of https://github.com/mkerrisk/man-pages
78 lines
2.3 KiB
Groff
78 lines
2.3 KiB
Groff
.\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.TH SCALB 3 2004-10-31 "" "Linux Programmer's Manual"
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.SH NAME
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scalb, scalbf, scalbl, scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl \-
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multiply floating-point number by integral power of radix
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.SH SYNOPSIS
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.B #include <math.h>
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.sp
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.BI "double scalb(double " x ", double " exp );
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.br
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.BI "float scalbf(float " x ", double " exp );
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.br
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.BI "long double scalbl(long double " x ", double " exp );
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.sp
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.BI "double scalbn(double " x ", int " exp );
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.br
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.BI "float scalbnf(float " x ", int " exp );
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.br
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.BI "long double scalbnl(long double " x ", int " exp );
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.sp
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.BI "double scalbln(double " x ", long int " exp );
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.br
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.BI "float scalblnf(float " x ", long int " exp );
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.br
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.BI "long double scalblnl(long double " x ", long int " exp );
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.sp
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Link with \-lm.
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.SH DESCRIPTION
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These functions multiply their first argument
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.I x
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by FLT_RADIX (probably 2) to the power
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.IR exp .
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If FLT_RADIX equals 2, then
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.BR scalbn ()
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is equivalent to
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.BR ldexp (3).
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The value of FLT_RADIX is found in
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.IR <float.h> .
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.\" not in /usr/include but in a gcc lib
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.SH "CONFORMING TO"
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The
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.BR scalb ()
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function is from 4.3BSD.
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The
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.BR scalbn ()
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and
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.BR scalbln ()
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functions are from C99.
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All three are in POSIX.1-2001.
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The
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.BR scalb ()
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function is marked obsolescent.
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.SH "SEE ALSO"
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.BR ldexp (3)
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