NAME

ceil — round to smallest integral value not less than x

SYNOPSIS

#include <math.h>

double
ceil(double x);

long double
ceill(long double x);

float
ceilf(float x);

DESCRIPTION

The ceil() functions return the smallest integral value greater than or equal to x.

SPECIAL VALUES

ceil(±0) returns ±0.

ceil(±infinity) returns ±infinity.

VECTOR OPERATIONS

If you need to apply the ceil() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may give significantly better performance:

#include <Accelerate/Accelerate.h>

vFloat vceilf(vFloat x);
void vvceilf(float *y, const float *x, const int *n);
void vvceil(double *y, const double *x, const int *n);

SEE ALSO

floor(3), round(3), trunc(3), math(3)

STANDARDS

The ceil() functions conform to ISO/IEC 9899:2011.