## Linux and UNIX Man Pages

Test Your Knowledge in Computers #245
Difficulty: Easy
In 1971, Ray Tomlinson, of BBN sent the first network e-mail.
True or False?

# ceil(3) [freebsd man page]

```CEIL(3) 						   BSD Library Functions Manual 						   CEIL(3)

NAME
ceil, ceilf, ceill -- smallest integral value greater than or equal to x

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
ceil(double x);

float
ceilf(float x);

long double
ceill(long double x);

DESCRIPTION
The ceil(), ceilf() and ceill() functions return the smallest integral value greater than or equal to x, expressed as a floating-point num-
ber.

abs(3), fabs(3), floor(3), ieee(3), math(3), rint(3), round(3), trunc(3)

STANDARDS
The ceil() function conforms to ISO/IEC 9899:1990 (``ISO C90'').  The ceilf() and ceill() functions conform to ISO/IEC 9899:1999
(``ISO C99'').

BSD								 January 13, 2005							       BSD```

## Check Out this Related Man Page

```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			   |
+-----------------------------+-----------------------------+

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

SunOS 5.11							    12 Jul 2006 							  ceil(3M)```

## math.h: float ceilf(float x)

Good morning, I'm testing the use of ceilf: /*Filename: str.c*/ #include <stdio.h> #include <math.h> int main (void) { float ceilf(float x); int dev=3, result=0; float tmp = 3.444f; printf("Result: %f\n",ceilf(tmp)); return 0; }

## How to get the ceiling value for floating numbers?

Dear guys; How can I get the ceiling value of any floating number using shell or awk scripts or functions. Example:- old values "7.2" or "7.8" or "7.5" --->>> ceiling function ---->>> new value "8". BR

## CEILING and FLOOR functions

Hi all, Does anyone know how to simulate a ceiling or floor function in UNIX? OS is Solaris. I tried the suggestion from an old forum but it is giving me error as below: server01/tmp\$: echo "7.2" | awk '{printf("%d\n",\$0+=\$0<0?0:0.999)}' awk: syntax error near line 1 awk: illegal...

## Ceil not working as function in awk statement

Hi, I have the following code in which i am trying to find ceil of 10th & 11th fields. For finding ceil i have a function in the awk statement. When i test it for some values say on command line it gives correct response(say \$10=0 & \$11=750). But when the same value occurs in a file having more 3...

## Rounding off a decimal

How to round off a decimal number to higher whole number using ceil command in unix? Eg. 4.41 or 4.11 or 4.51 should be rounded off to 5.