ceil

Calculates the ceiling of a value.

doubleceil(doublex**);**

For additional compatibility information, see Compatibility in the Introduction.

Libraries

Return Value

The ceil function returns a double value representing the smallest integer that is greater than or equal to x. There is no error return.

Parameter

x

Floating-point value

Example

/* FLOOR.C: This example displays the largest integers
 * less than or equal to the floating-point values 2.8
 * and -2.8. It then shows the smallest integers greater
 * than or equal to 2.8 and -2.8.
 */

#include <math.h>
#include <stdio.h>

void main( void )
{
   double y;

   y = floor( 2.8 );
   printf( "The floor of 2.8 is %f\n", y );
   y = floor( -2.8 );
   printf( "The floor of -2.8 is %f\n", y );

   y = ceil( 2.8 );
   printf( "The ceil of 2.8 is %f\n", y );
   y = ceil( -2.8 );
   printf( "The ceil of -2.8 is %f\n", y );
}

Output

The floor of 2.8 is 2.000000
The floor of -2.8 is -3.000000
The ceil of 2.8 is 3.000000
The ceil of -2.8 is -2.000000

Floating-Point Support Routines

See Also   floor, fmod