osx man page for floor

FLOOR(3)						   BSD Library Functions Manual 						  FLOOR(3)

NAME
     floor -- round to largest integral value not greater than x

SYNOPSIS
     #include <math.h>

     double
     floor(double x);

     long double
     floorl(long double x);

     float
     floorf(float x);

DESCRIPTION
     The floor() functions return the largest integral value less than or equal to x.

SPECIAL VALUES
     floor(+-0) returns +-0.

     floor(+-infinity) returns +-infinity.

VECTOR OPERATIONS
     If you need to apply the floor() 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 vfloorf(vFloat x);
     void vvfloorf(float *y, const float *x, const int *n);
     void vvfloor(double *y, const double *x, const int *n);

SEE ALSO
     ceil(3), round(3), trunc(3), math(3)

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

BSD
								 December 11, 2006							       BSD