Man page - nextdownf(3)

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Manual

nextup

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
STANDARDS
HISTORY
SEE ALSO

NAME

nextup, nextupf, nextupl, nextdown, nextdownf, nextdownl - return next floating-point number toward positive/negative infinity

LIBRARY

Math library ( libm , -lm )

SYNOPSIS

#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <math.h>

double nextup(double x );
float nextupf(float x );
long double nextupl(long double x );

double nextdown(double x );
float nextdownf(float x );
long double nextdownl(long double x );

DESCRIPTION

The nextup (), nextupf (), and nextupl () functions return the next representable floating-point number greater than x .

If x is the smallest representable negative number in the corresponding type, these functions return -0. If x is 0, the returned value is the smallest representable positive number of the corresponding type.

If x is positive infinity, the returned value is positive infinity. If x is negative infinity, the returned value is the largest representable finite negative number of the corresponding type.

If x is Nan, the returned value is NaN.

The value returned by nextdown(x) is -nextup(-x) , and similarly for the other types.

RETURN VALUE

See DESCRIPTION.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

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STANDARDS

These functions are described in IEEE Std 754-2008 - Standard for Floating-Point Arithmetic and ISO/IEC TS 18661 .

HISTORY

glibc 2.24.

SEE ALSO

nearbyint (3), nextafter (3)