ceil(), ceilf()

Round up a value to the next integer

Synopsis:

#include <math.h>

double ceil( double x );

float ceilf( float x );

Library:

libm

Description:

The ceil() and ceilf() functions round the value of x up to the next integer (rounding towards the "ceiling").

Returns:

The smallest integer >= x.

Examples:

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

int main( void )
{
    printf( "%f %f %f %f %f\n", ceil( -2.1 ), 
      ceil( -2. ), ceil( 0.0 ), ceil( 2. ), 
      ceil( 2.1 ) );

    return EXIT_SUCCESS;
}

produces the output:

-2.000000 -2.000000 0.000000 2.000000 3.000000

Classification:

ANSI

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	No
Thread	Yes