mirror of https://github.com/mkerrisk/man-pages
67 lines
2.2 KiB
Groff
67 lines
2.2 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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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.\" manual page may be incorrect or out-of-date.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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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
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.\" Modified 2002-07-27 by Walter Harms
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.\" (walter.harms@informatik.uni-oldenburg.de)
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.\"
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.TH MODF 3 2002-07-27 "" "Linux Programmer's Manual"
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.SH NAME
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modf, modff, modfl \- extract signed integral and fractional values from
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floating-point number
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.SH SYNOPSIS
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.nf
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.B #include <math.h>
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.sp
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.BI "double modf(double " x ", double *" iptr );
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.br
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.BI "float modff(float " x ", float *" iptr );
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.br
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.BI "long double modfl(long double " x ", long double *" iptr );
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.fi
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.sp
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Link with \fI\-lm\fP.
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.SH DESCRIPTION
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The
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.BR modf ()
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function breaks the argument \fIx\fP into an integral
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part and a fractional part, each of which has the same sign as \fIx\fP.
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The integral part is stored in \fIiptr\fP.
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.SH "RETURN VALUE"
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The
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.BR modf ()
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function returns the fractional part of \fIx\fP.
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.SH "CONFORMING TO"
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SVr4, 4.3BSD, C89.
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The
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.I float
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and
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.I "long double"
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variants are C99 requirements.
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.SH "SEE ALSO"
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.BR frexp (3),
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.BR ldexp (3)
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