CEIL(3) BSD Library Functions Manual CEIL(3)NAME
ceil -- round to smallest integral value not less than x
SYNOPSIS
#include <math.h>
double
ceil(double x);
float
ceilf(float x);
DESCRIPTION
The ceil() and ceilf() functions return the smallest integral value greater than or equal to x.
SPECIAL VALUES
ceil(+-0) returns +-0.
ceil(+-infinity) returns +-infinity.
SEE ALSO abs(3), fabs(3), floor(3), ieee(3), rint(3), math(3)STANDARDS
The ceil() and ceilf() functions conform to ISO/IEC 9899:1999(E).
BSD July 2, 2003 BSD
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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
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 5.11 12 Jul 2006 ceil(3M)