ROUND(3M) Mathematical Library Functions ROUND(3M)

round, roundf, roundl - round to nearest integer value in floating-point format

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
double round(double x);

float roundf(float x);

long double roundl(long double x);

These functions round their argument to the nearest integer value in floating-point format, rounding halfway cases away from 0, regardless of the current rounding direction.

Upon successful completion, these functions return the rounded integer value.

If x is NaN, a NaN is returned.

If x is ±0 or ± Inf, x is returned.

See attributes(7) for descriptions of the following attributes:

Interface Stability Standard
MT-Level MT-Safe

math.h(3HEAD), feclearexcept(3M), fetestexcept(3M), attributes(7), standards(7)

July 12, 2006 SunOS 5.11