RINT(3) BSD Library Functions Manual RINT(3)[top]NAMErint— round-to-closest integer functionsSYNOPSIS#include <math.h> double rint(double x);DESCRIPTIONThe rint() function finds the integer (represented as a double precision number) nearest to x in the direction of the prevailing rounding mode.NOTESOn a VAX, rint(x) is equivalent to adding half to the magnitude and then rounding towards zero. In the default rounding mode, to nearest, on a machine that conforms to IEEE 754, rint(x) is the integer nearest x with the additional stipula‐ tion that if |rint(x)-x|=1/2 then rint(x) is even. Other rounding modes can make rint() act like floor(), or like ceil(), or round towards zero. Another way to obtain an integer near x is to declare (in C) double x; int k; k = x; Most C compilers round x towards 0 to get the integer k, but some do oth‐ erwise. If in doubt, use floor(), ceil(), or rint() first, whichever you intend. Also note that, if x is larger than k can accommodate, the value of k and the presence or absence of an integer overflow are hard to pre‐ dict.SEE ALSOabs(3), fabs(3), ceil(3), floor(3), ieee(3), math(3)HISTORYA rint() function appeared in Version 6 AT&T UNIX.BSDDecember 11, 1993 BSD

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