mirror of https://github.com/mkerrisk/man-pages
60 lines
1.3 KiB
Groff
60 lines
1.3 KiB
Groff
.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
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.\"
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.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
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.\" Distributed under GPL
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.\" %%%LICENSE_END
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.\"
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.\" heavily based on glibc infopages, copyright Free Software Foundation
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.\"
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.TH SIGNIFICAND 3 2009-02-04 "GNU" "Linux Programmer's Manual"
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.SH NAME
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significand, significandf, significandl \-
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get mantissa of floating-point number
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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 significand(double " x );
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.br
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.BI "float significandf(float " x );
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.br
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.BI "long double significandl(long double " x );
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.sp
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Link with \fI\-lm\fP.
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.ad l
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.BR significand (),
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.BR significandf (),
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.BR significandl ():
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.RS 4
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_SVID_SOURCE || _BSD_SOURCE
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.RE
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.ad b
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.SH DESCRIPTION
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The
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.BR significand ()
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function returns the mantissa of
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.I x
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scaled to the range [1,2).
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It is equivalent to
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.sp
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.in +4n
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scalb(x, (double) \-ilogb(x))
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.in
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.PP
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This function exists mainly for use in certain standardized tests
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for IEEE 754 conformance.
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.SH CONFORMING TO
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These functions are nonstandard; the
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.I double
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version is available on a number of other systems.
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.\" .SH HISTORY
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.\" This function came from BSD.
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.SH SEE ALSO
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.BR ilogb (3),
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.BR scalb (3)
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