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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(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Standard

MT-Level MT-Safe

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