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FreeBSD 11.0 - man page for floorf (freebsd section 3)

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

NAME
floor, floorf, floorl -- largest integral value less than or equal to x
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double floor(double x); float floorf(float x); long double floorl(long double x);
DESCRIPTION
The floor(), floorf() and floorl() functions return the largest integral value less than or equal to x, expressed as a floating-point number.
SEE ALSO
abs(3), ceil(3), fabs(3), ieee(3), math(3), rint(3), round(3), trunc(3)
STANDARDS
The floor() function conforms to ISO/IEC 9899:1990 (``ISO C90''). The floorf() and floorl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').
BSD
January 13, 2005 BSD