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(freebsd section 3)
man page for truncl

TRUNC(3)						   BSD Library Functions Manual 						  TRUNC(3)

NAME
trunc, truncf, truncl -- nearest integral value with magnitude less than or equal to |x| LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double trunc(double x); float truncf(float x); long double truncl(long double x); DESCRIPTION
The trunc(), truncf(), and truncl() functions return the nearest integral value with magnitude less than or equal to |x|. They are equiva- lent to rint(), rintf(), and rintl(), respectively, in the FE_TOWARDZERO rounding mode. SEE ALSO
ceil(3), fesetround(3), floor(3), math(3), nextafter(3), rint(3), round(3) STANDARDS
The trunc(), truncf(), and truncl() functions conform to ISO/IEC 9899:1999 (``ISO C99''). HISTORY
These routines first appeared in FreeBSD 5.3. BSD
April 16, 2005 BSD

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