sunos man page for ceil

ceil(3M)						  Mathematical Library Functions						  ceil(3M)

NAME
       ceil, ceilf, ceill - ceiling value function

SYNOPSIS
       cc [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double ceil(double x);

       float ceilf(float x);

       long double ceill(long double x);

DESCRIPTION
       These functions compute the smallest integral value not less than x.

RETURN VALUES
       Upon  successful  completion, the ceil(), ceilf(), and ceill() functions return the smallest integral value not less than x, expressed as a
       type double, float, or long double, respectively.

       If x is NaN, a NaN is returned.

       If x is +-0 or +-Inf, x is returned.

USAGE
       The integral value returned by these functions need not be expressible as an int or long int. The return  value	should	be  tested  before
       assigning it to an integer type to avoid the undefined results of an integer overflow.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       feclearexcept(3M), fetestexcept(3M), floor(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.10							    1 Nov 2003								  ceil(3M)