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Mathematical Library Functionsceil(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 TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

SEE ALSO

 

floor(3M), isnan(3M), attributes(5)


SunOS 5.9Go To TopLast Changed 29 Dec 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.