ROUND(3) BSD Programmer's Manual ROUND(3)
round, roundf - round to nearest integral value
libm
#include <math.h> double round(double x); float roundf(float x);
The round() and roundf() 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), math(3), rint(3), trunc(3)
The round() and roundf() functions conform to ISO/IEC 9899:1999 ("ISO C99").
The round() and roundf() functions appeared in NetBSD 2.0. MirBSD #10-current July 15, 2004 1