Calculate the ceiling of a value.
#include <math.h>
double ceil( double x);
long double _ceill( long double x);
| x | Floating-point value |
The ceil and _ceill functions return a double (or long double) value representing the smallest integer that is greater than or equal to x.
The _ceill function is the 80-bit counterpart and it uses the 80-bit, 10-byte coprocessor form of arguments and return values. See the reference page on the long double functions for more details on this data type.
These functions return the double or long double result. There is no error return.
ceil
Standards:ANSI, UNIX
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:DOS32X
_ceill
Standards:None
16-Bit:DOS, QWIN, WIN, WIN DLL
32-Bit:None
/* 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 );
}
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