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+'\" et
+.TH CEIL "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+ceil,
+ceilf,
+ceill
+\(em ceiling value function
+.SH SYNOPSIS
+.LP
+.nf
+#include <math.h>
+.P
+double ceil(double \fIx\fP);
+float ceilf(float \fIx\fP);
+long double ceill(long double \fIx\fP);
+.fi
+.SH DESCRIPTION
+The functionality described on this reference page is aligned with the
+ISO\ C standard. Any conflict between the requirements described here and the
+ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
+.P
+These functions shall compute the smallest integral value not less than
+.IR x .
+.SH "RETURN VALUE"
+The result shall have the same sign as
+.IR x .
+.P
+Upon successful completion,
+\fIceil\fR(),
+\fIceilf\fR(),
+and
+\fIceill\fR()
+shall return the smallest integral value not less than
+.IR x ,
+expressed as a type
+.BR double ,
+.BR float ,
+or
+.BR "long double" ,
+respectively.
+.P
+If
+.IR x
+is NaN, a NaN shall be returned.
+.P
+If
+.IR x
+is \(+-0 or \(+-Inf,
+.IR x
+shall be returned.
+.SH ERRORS
+No errors are defined.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+The integral value returned by these functions need not be expressible
+as an
+.BR intmax_t .
+The return value should be tested before assigning it to an integer
+type to avoid the undefined results of an integer overflow.
+.P
+These functions may raise the inexact floating-point exception if the
+result differs in value from the argument.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIfeclearexcept\fR\^(\|)",
+.IR "\fIfetestexcept\fR\^(\|)",
+.IR "\fIfloor\fR\^(\|)",
+.IR "\fIisnan\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 4.20" ", " "Treatment of Error Conditions for Mathematical Functions",
+.IR "\fB<math.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .