NEXTAFTER(3) BSD Programmer's Manual NEXTAFTER(3)
nextafter, nextafterf - next representable floating-point number
#include <math.h> double nextafter(double x, double y); float nextafterf(float x, float y);
The nextafter() and nextafterf() functions return the next machine representable number from x in direction of y. In other words, if y is less than x, the functions 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.
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 ei- ther 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 function value (if representable) is returned.
The described functions conform to ISO/IEC 9899:1999 ("ISO C99"). MirOS BSD #10-current February 9, 2014 1
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