nearbyint(), nearbyintf(), nearbyintl()

Return a rounded integer value

Synopsis:

#include <math.h>

double nearbyint( double x);

float nearbyintf( float x);

long double nearbyintl( long double x);

Arguments:

x: The number that you want to round.

Library:

libm

Use the -l m option to qcc to link against this library.

Description:

The nearbyint(), nearbyintf(), and nearbyintl() functions round their argument to an integer value in floating-point format, using the current rounding direction and without raising the inexact floating-point exception.

To check for error situations, use feclearexcept() and fetestexcept(). For example:

Call feclearexcept(FE_ALL_EXCEPT) before calling nearbyint(), nearbyintf(), or nearbyintl().
On return, if fetestexcept(FE_ALL_EXCEPT) is nonzero, then an error has occurred.

Returns:

The rounded integer value, with the same sign as x.

If `x` is:	These functions return:	Errors:
±0.0	±0.0	—
±Inf	`x`	—
NaN	NaN	—

These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.

Classification:

ANSI, POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	No
Thread	Yes