NAME

ceil, ceilf, ceill, floor, floorf, floorl — ceiling and floor

LIBRARY

Math Library (libm, -lm)

SYNOPSIS

#include <math.h>

double
ceil(double x);

float
ceilf(float x);

long double
ceill(long double x);

double
floor(double x);

float
floorf(float x);

long double
floorl(long double x);

DESCRIPTION

The ceil(), ceilf(), and ceill() functions return the smallest integral value greater than or equal to x. Conversely, the floor(), floorf(), and floorl() functions return the largest integral value less than or equal to x.

SEE ALSO

abs(3), fabs(3), math(3), nextafter(3), rint(3)

STANDARDS

The described functions conform to ISO/IEC 9899:1999 (“ISO C99”).