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

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

     Math Library (libm, -lm)

     #include <math.h>

     nextafter(double x, double y);

     nextafterf(float x, float y);

     long double
     nextafterl(long double x, long double y);

     nexttoward(double x, long double y);

     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

	   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.

     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.


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

BSD					September 18, 2011				      BSD
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