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Man Pages
NEXTAFTER(3) FreeBSD Library Functions Manual NEXTAFTER(3)

nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl
next representable value

Math Library (libm, -lm)

#include <math.h>
double
nextafter(double x, double y);
float
nextafterf(float x, float y);
long double
nextafterl(long double x, long double y);
double
nexttoward(double x, long double y);
float
nexttowardf(float x, long double y);
long double
nexttowardl(long double x, long double y);

These functions return the next machine representable number from x in direction y.

ieee(3), math(3)

The nextafter(), nextafterf(), nextafterl(), nexttoward(), nexttowardf(), and nexttowardl() routines conform to ISO/IEC 9899:1999 (“ISO C99”). They implement the Nextafter function recommended by IEEE Std 754-1985, with the extension that nextafter(+0.0, -0.0) returns -0.0, and nextafter(-0.0, +0.0) returns +0.0.

The nextafter() function appeared in 4.3BSD, and nextafterf() appeared in FreeBSD 2.0.
May 4, 2005 FreeBSD 12.0-RELEASE

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