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man pages section 3: Extended Library Functions, Volume 2

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Updated: Thursday, June 13, 2019
 
 

rint(3M)

Name

rint, rintf, rintl - round-to-nearest integral value

Synopsis

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

double rint(double x);
float rintf(float x);
long double rintl(long double x);

Description

These functions return the integral value (represented as a double) nearest x in the direction of the current rounding mode.

If the current rounding mode rounds toward negative infinity, rint() is equivalent to floor(3M). If the current rounding mode rounds toward positive infinity, rint() is equivalent to ceil(3M).

These functions differ from the nearbyint(3M), nearbyintf(), and nearbyintl() functions only in that they might raise the inexact floating-point exception if the result differs in value from the argument.

Return Values

Upon successful completion, these functions return the integer (represented as a double precision number) nearest x in the direction of the current rounding mode.

If x is NaN, a NaN is returned.

If x is ±0 or ±Inf, x is returned.

Attributes

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

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
Availability
system/library/math
MT-Level
MT-Safe
Standard

See Also

abs(3C), math.h(3HEAD), ceil(3M), feclearexcept(3M), fetestexcept(3M), floor(3M), isnan(3M), nearbyint(3M), attributes(7), standards(7)