ceil(3M)
NAME
ceil − ceiling value function
SYNOPSIS
cc [ flag ... ] file ... −lm [ library ... ]
#include <math.h>
double ceil(double x);
DESCRIPTION
The ceil() function computes the smallest integral value not less than x.
RETURN VALUES
Upon successful completion, ceil() returns the smallest integral value not less than x, expressed as a type double.
If x is NaN, NaN is returned.
If x is ±Inf or ±0, x is returned.
ERRORS
No errors will occur.
USAGE
The integral value returned by ceil() as a double may 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 |
| MT-Level | MT-Safe |
SEE ALSO
floor(3M), isnan(3M), attributes(5)
SunOS 5.6 — Last change: 29 Dec 1996