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TRUNC(3) Library Functions Manual TRUNC(3)

trunc, truncf, truncl
nearest integral value with magnitude less than or equal to |x|

#include <math.h>

double
trunc(double x);

float
truncf(float x);

long double
truncl(long double x);

The trunc(), truncf() and truncl() functions return the nearest integral value with magnitude less than or equal to |x|. They are equivalent to rint(), rintf() and rintl() respectively, in the rounding towards zero mode.

ceil(3), fesetround(3), floor(3), nextafter(3), rint(3), round(3)

The trunc(), truncf() and truncl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
August 14, 2013 OpenBSD-current