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-'\" t
-.\" Copyright 2001 Andries Brouwer <aeb@cwi.nl>.
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH ceil 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-ceil, ceilf, ceill \- ceiling function: smallest integral value not
-less than argument
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.PP
-.BI "double ceil(double " x );
-.BI "float ceilf(float " x );
-.BI "long double ceill(long double " x );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR ceilf (),
-.BR ceill ():
-.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 return the smallest integral value that is not less than
-.IR x .
-.PP
-For example,
-.I ceil(0.5)
-is 1.0, and
-.I ceil(\-0.5)
-is 0.0.
-.SH RETURN VALUE
-These functions return the ceiling of
-.IR x .
-.PP
-If
-.I x
-is integral, +0, \-0, NaN, or infinite,
-.I x
-itself is returned.
-.SH ERRORS
-No errors occur.
-POSIX.1-2001 documents a range error for overflows, but see NOTES.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.BR ceil (),
-.BR ceilf (),
-.BR ceill ()
-T} Thread safety MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.PP
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD, C89.
-.SH NOTES
-SUSv2 and POSIX.1-2001 contain text about overflow (which might set
-.I errno
-to
-.BR ERANGE ,
-or raise an
-.B FE_OVERFLOW
-exception).
-In practice, the result cannot overflow on any current machine,
-so this error-handling stuff is just nonsense.
-.\" The POSIX.1-2001 APPLICATION USAGE SECTION discusses this point.
-(More precisely, overflow can happen only when the maximum value
-of the exponent is smaller than the number of mantissa bits.
-For the IEEE-754 standard 32-bit and 64-bit floating-point numbers
-the maximum value of the exponent is 127 (respectively, 1023),
-and the number of mantissa bits
-including the implicit bit
-is 24 (respectively, 53).)
-.PP
-The integral value returned by these functions may be too large
-to store in an integer type
-.RI ( int ,
-.IR long ,
-etc.).
-To avoid an overflow, which will produce undefined results,
-an application should perform a range check on the returned value
-before assigning it to an integer type.
-.SH SEE ALSO
-.BR floor (3),
-.BR lrint (3),
-.BR nearbyint (3),
-.BR rint (3),
-.BR round (3),
-.BR trunc (3)