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ROUND(3) Library Functions Manual ROUND(3)

round, roundf, roundl
round to nearest integral value

#include <math.h>

double
round(double x);

float
roundf(float x);

long double
roundl(long double x);

The round(), roundf() and roundl() functions return the nearest integral value to x; if x lies halfway between two integral values, then these functions return the integral value with the larger absolute value (i.e., they round away from zero).

ceil(3), floor(3), lrint(3), lround(3), nextafter(3), rint(3), trunc(3)

These functions conform to ISO/IEC 9899:1999 (“ISO C99”).
July 7, 2011 OpenBSD-current