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NEXTAFTER(3) libc math functions NEXTAFTER(3)
nextafter, nexttoward - floating point number manipulation
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);
long double nexttowardl(long double x, long double y);
The nextafter() functions return the next representable neighbor of x in the direction
towards y. The size of the step between x and the result depends on the type of the
result. If x = y the function simply returns y. If either value is NaN, then NaN is
returned. Otherwise a value corresponding to the value of the least significant bit in
the mantissa is added or subtracted, depending on the direction.
The nexttoward() functions do the same as the nextafter() functions, except that they have
a long double second argument.
These functions will signal overflow or underflow if the result goes outside of the range
of normalized numbers.
C99. This function is defined in IEC 559 (and the appendix with recommended functions in
IEEE 754/IEEE 854).
GNU 2002-08-10 NEXTAFTER(3)
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