1.51 round, roundf—round to integer, to nearest

Synopsis

     #include <math.h>
     double round(double x);
     float roundf(float x);
     

Description
The round functions round their argument to the nearest integer value in floating-point format, rounding halfway cases away from zero, regardless of the current rounding direction. (While the "inexact" floating-point exception behavior is unspecified by the C standard, the round functions are written so that "inexact" is not raised if the result does not equal the argument, which behavior is as recommended by IEEE 754 for its related functions.)