ceil(3M)

NAME

ceil(), ceilf(), ceill(), ceilw(), ceilq() — ceiling functions

SYNOPSIS

#include <math.h>

double ceil(double x);

Itanium(R)-based System Only

float ceilf(float x);

long double ceill(long double x);

extended ceilw(extended x);

quad ceilq(quad x);

DESCRIPTION

The ceil() returns the smallest integer (represented as a double-precision number) not less than x.

Itanium-based System Only

ceilf() is a float version of ceil(); it takes a float argument and returns a float result.

ceill() is a long double version of ceil(); it takes a long double argument and returns a long double result.

ceilw() is an extended version of ceil(); it takes an extended argument and returns an extended result.

ceilq() is equivalent to ceill() on HP-UX systems.

USAGE

To use (for Itanium-based systems) ceilf(), compile either with the default -Ae option or with the -Aa option.

To use (for Itanium-based systems) ceill(), ceilw(), or ceilq(), compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options.

To use (for Itanium-based systems) ceilw() or ceilq(), compile also with the -fpwidetypes option.

To use these functions, make sure your program includes <math.h>. Link in the math library by specifying -lm on the compiler or linker command line.

For more information, see the HP-UX Floating-Point Guide.

RETURN VALUE

If x is ±INFINITY or ±zero, ceil() returns x.

If x is NaN, ceil() returns NaN.

ceil() may raise the inexact exception if x is non integral and finite.

ERRORS

No errors are defined.

STANDARDS CONFORMANCE

ceil() : SVID3, XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

ceilf(), ceill() : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')