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NetBSD 6.1.5 - man page for nextafter (netbsd section 3)

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NEXTAFTER(3)			   BSD Library Functions Manual 		     NEXTAFTER(3)

NAME
     nextafter, nextafterf, nextafterl, nexttoward -- next representable floating-point number

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #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);

DESCRIPTION
     The nextafter(), nextafterf(), and nextafterl() functions return the next machine repre-
     sentable number from x in direction of y.	In other words, if y is less than x, the func-
     tions return the largest representable floating-point number less than x.	When x equals y,
     the value of y is returned.  The three functions differ only in the type of the return value
     and x.

     The nexttoward() function is equivalent to the nextafter() family of functions with two
     exceptions:

	   1.	The second parameter has a type long double.

	   2.	The return value is y converted to the type of the function, provided that x
		equals y.

RETURN VALUES
     Upon successful completion, the described functions return the next representable floating-
     point value as described above.  If x is finite but an overflow would occur, a range error
     follows and the functions return +-HUGE_VAL, +-HUGE_VALF, or +-HUGE_VALL with the same sign
     as x.  When either x or y is NaN, a NaN is returned.  When x is not y but the function value
     is subnormal, zero, or underflows, a range error occurs, and either 0.0 or the correct func-
     tion value (if representable) is returned.

SEE ALSO
     math(3)

STANDARDS
     The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BSD					September 18, 2011				      BSD
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