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NEXTAFTER(3) BSD Library Functions Manual NEXTAFTER(3)NAMEnextafter, nextafterf, nextafterl, nexttowardnext representable floating-point number--LIBRARYMath 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);DESCRIPTIONThe 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 VALUESUpon 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 ALSOmath(3)STANDARDSThe described functions conform to ISO/IEC 9899:1999 (``ISO C99'').BSDSeptember 18, 2011 BSD

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