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NEXTAFTER(3) Library Functions Manual NEXTAFTER(3) NAME nextafter, nextafterf, nextafterl, nexttoward, nexttowardf - 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); float nexttowardf(float x, long double y); DESCRIPTION The nextafter(), nextafterf(), and nextafterl() 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. The nexttoward() and nexttowardf() functions are 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 function value (if representable) is returned. SEE ALSO math(3) STANDARDS The described functions conform to ISO/IEC 9899:1999 ("ISO C99"). NetBSD 8.0 September 13, 2015 NetBSD 8.0