ceil(3M) Mathematical Library Functions ceil(3M)NAME
ceil, ceilf, ceill - ceiling value function
SYNOPSIS
c99 [ 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 assign‐
ing 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 │Committed │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
├─────────────────────────────┼─────────────────────────────┤
│Standard │See standards(5). │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOfeclearexcept(3M), fetestexcept(3M), floor(3M), isnan(3M),
math.h(3HEAD), attributes(5), standards(5)SunOS 5.11 12 Jul 2006 ceil(3M)