round(3M)

Name

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

Synopsis

c99 [ flag... ] file... –lm [ library... ]
#include <math.h>

double round(double x);

float roundf(float x);

long double roundl(long double x);

Description

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.

Return Values

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.

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE Interface Stability Committed MT-Level MT-Safe Standard See standards(5).

See also

feclearexcept(3M), fetestexcept(3M), math.h(3HEAD), attributes(5), standards(5)