nextafter, nextafterf, nextafterl, nexttoward, nexttowardf, nexttowardl - next displayable floating-point number

Syntax	#include <math.h> double nextafter(double x, double y); C11 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); (End)
Description	These functions return the next displayable floating-point number that follows x in direction y. If y is less than x, the largest displayable floating-point number smaller than x is returned.
Return val.	Next displayable floating-point number that follows x in direction y
		if successful.
	+/-HUGE_VAL +/-HUGE_VALF +/-HUGE_VALL	depending on the function type and the sign of x, if an error occurs. errno is set to indicate the error.
Errors	nextafter(), nextafterf(), nextafterl(), nexttoward(), nexttowardf() and nexttowardl() will fail if:
	ERANGE	x is finite but the result of the function-call would cause an overflow.
See also	math.h.